Merge pull request #18325 from rafaelfranca/rm-remove-deprecations

Remove all deprecation code

92 files changed, 339 insertions, 1433 deletions

diff --git a/actionmailer/CHANGELOG.md b/actionmailer/CHANGELOG.md
index ba9e1b0607..787dc46f00 100644
--- a/actionmailer/CHANGELOG.md
+++ b/actionmailer/CHANGELOG.md
@@ -1,3 +1,11 @@
+*   Remove deprecate `*_path` helpers in email views.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `deliver` and `deliver!` methods.
+
+    *claudiob*
+
 *   Template lookup now respects default locale and I18n fallbacks.
 
     Given the following templates:
diff --git a/actionmailer/lib/action_mailer/message_delivery.rb b/actionmailer/lib/action_mailer/message_delivery.rb
index b5dc2d7497..ff2cb0fd01 100644
--- a/actionmailer/lib/action_mailer/message_delivery.rb
+++ b/actionmailer/lib/action_mailer/message_delivery.rb
@@ -1,5 +1,4 @@
 require 'delegate'
-require 'active_support/core_ext/string/filters'
 
 module ActionMailer
 
@@ -85,26 +84,6 @@ module ActionMailer
       message.deliver
     end
 
-    def deliver! #:nodoc:
-      ActiveSupport::Deprecation.warn(<<-MSG.squish)
-        `#deliver!` is deprecated and will be removed in Rails 5. Use
-        `#deliver_now!` to deliver immediately or `#deliver_later!` to
-        deliver through Active Job.
-      MSG
-
-      deliver_now!
-    end
-
-    def deliver #:nodoc:
-      ActiveSupport::Deprecation.warn(<<-MSG.squish)
-        `#deliver` is deprecated and will be removed in Rails 5. Use
-        `#deliver_now` to deliver immediately or `#deliver_later` to
-        deliver through Active Job.
-      MSG
-
-      deliver_now
-    end
-
     private
 
       def enqueue_delivery(delivery_method, options={})
diff --git a/actionmailer/test/message_delivery_test.rb b/actionmailer/test/message_delivery_test.rb
index 9abf8b225c..55ee00602a 100644
--- a/actionmailer/test/message_delivery_test.rb
+++ b/actionmailer/test/message_delivery_test.rb
@@ -32,25 +32,6 @@ class MessageDeliveryTest < ActiveSupport::TestCase
     assert_equal Mail::Message , @mail.message.class
   end
 
-  test 'should respond to .deliver' do
-    assert_respond_to @mail, :deliver
-  end
-
-  test 'should respond to .deliver!' do
-    assert_respond_to @mail, :deliver!
-  end
-
-  test '.deliver is deprecated' do
-    assert_deprecated do
-      @mail.deliver
-    end
-  end
-  test '.deliver! is deprecated' do
-    assert_deprecated do
-      @mail.deliver!
-    end
-  end
-
   test 'should respond to .deliver_later' do
     assert_respond_to @mail, :deliver_later
   end
diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 838380ff71..2e5088cfbe 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,39 @@
+*   Remove deprecated assertion files.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated usage of string keys in URL helpers.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `only_path` option on `*_path` helpers.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `NamedRouteCollection#helpers`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated support to define routes with `:to` option that doesn't contain `#`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `ActionDispatch::Response#to_ary`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `ActionDispatch::Request#deep_munge`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `ActionDispatch::Http::Parameters#symbolized_path_parameters`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated option `use_route` in controller tests.
+
+    *Rafael Mendonça França*
+
 *   Ensure `append_info_to_payload` is called even if an exception is raised.
 
     Fixes an issue where when an exception is raised in the request the additonal
diff --git a/actionpack/lib/action_controller/test_case.rb b/actionpack/lib/action_controller/test_case.rb
index 9a77f179d3..2e6c58b83a 100644
--- a/actionpack/lib/action_controller/test_case.rb
+++ b/actionpack/lib/action_controller/test_case.rb
@@ -2,7 +2,6 @@ require 'rack/session/abstract/id'
 require 'active_support/core_ext/object/to_query'
 require 'active_support/core_ext/module/anonymous'
 require 'active_support/core_ext/hash/keys'
-require 'active_support/deprecation'
 
 require 'rails-dom-testing'
 
@@ -714,28 +713,7 @@ module ActionController
             :relative_url_root => nil,
             :_recall => @request.path_parameters)
 
-          if route_name = options.delete(:use_route)
-            ActiveSupport::Deprecation.warn <<-MSG.squish
-              Passing the `use_route` option in functional tests are deprecated.
-              Support for this option in the `process` method (and the related
-              `get`, `head`, `post`, `patch`, `put` and `delete` helpers) will
-              be removed in the next version without replacement.
-
-              Functional tests are essentially unit tests for controllers and
-              they should not require knowledge to how the application's routes
-              are configured. Instead, you should explicitly pass the appropiate
-              params to the `process` method.
-
-              Previously the engines guide also contained an incorrect example
-              that recommended using this option to test an engine's controllers
-              within the dummy application. That recommendation was incorrect
-              and has since been corrected. Instead, you should override the
-              `@routes` variable in the test case with `Foo::Engine.routes`. See
-              the updated engines guide for details.
-            MSG
-          end
-
-          url, query_string = @routes.path_for(options, route_name).split("?", 2)
+          url, query_string = @routes.path_for(options).split("?", 2)
 
           @request.env["SCRIPT_NAME"] = @controller.config.relative_url_root
           @request.env["PATH_INFO"] = url
diff --git a/actionpack/lib/action_dispatch/http/parameters.rb b/actionpack/lib/action_dispatch/http/parameters.rb
index a5cd26a3c1..c2f05ecc86 100644
--- a/actionpack/lib/action_dispatch/http/parameters.rb
+++ b/actionpack/lib/action_dispatch/http/parameters.rb
@@ -1,6 +1,5 @@
 require 'active_support/core_ext/hash/keys'
 require 'active_support/core_ext/hash/indifferent_access'
-require 'active_support/deprecation'
 
 module ActionDispatch
   module Http
@@ -25,13 +24,6 @@ module ActionDispatch
         @env[PARAMETERS_KEY] = parameters
       end
 
-      def symbolized_path_parameters
-        ActiveSupport::Deprecation.warn(
-          '`symbolized_path_parameters` is deprecated. Please use `path_parameters`.'
-        )
-        path_parameters
-      end
-
       # Returns a hash with the \parameters used to form the \path of the request.
       # Returned hash keys are strings:
       #
diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index d211ea2b77..cadbfc88cb 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -337,15 +337,6 @@ module ActionDispatch
       LOCALHOST =~ remote_addr && LOCALHOST =~ remote_ip
     end
 
-    # Extracted into ActionDispatch::Request::Utils.deep_munge, but kept here for backwards compatibility.
-    def deep_munge(hash)
-      ActiveSupport::Deprecation.warn(
-        'This method has been extracted into `ActionDispatch::Request::Utils.deep_munge`. Please start using that instead.'
-      )
-
-      Utils.deep_munge(hash)
-    end
-
     protected
       def parse_query(qs)
         Utils.deep_munge(super)
diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 33de2f8b5f..4061ea71a3 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -1,6 +1,4 @@
 require 'active_support/core_ext/module/attribute_accessors'
-require 'active_support/core_ext/string/filters'
-require 'active_support/deprecation'
 require 'action_dispatch/http/filter_redirect'
 require 'monitor'
 
@@ -284,20 +282,6 @@ module ActionDispatch # :nodoc:
     end
     alias prepare! to_a
 
-    # Be super clear that a response object is not an Array. Defining this
-    # would make implicit splatting work, but it also makes adding responses
-    # as arrays work, and "flattening" responses, cascading to the rack body!
-    # Not sensible behavior.
-    def to_ary
-      ActiveSupport::Deprecation.warn(<<-MSG.squish)
-        `ActionDispatch::Response#to_ary` no longer performs implicit conversion
-        to an array. Please use `response.to_a` instead, or a splat like `status,
-        headers, body = *response`.
-      MSG
-
-      to_a
-    end
-
     # Returns the response cookies, converted to a Hash of (name => value) pairs
     #
     #   assert_equal 'AuthorOfNewPage', r.cookies['author']
diff --git a/actionpack/lib/action_dispatch/journey/formatter.rb b/actionpack/lib/action_dispatch/journey/formatter.rb
index 177f586c0e..992c1a9efe 100644
--- a/actionpack/lib/action_dispatch/journey/formatter.rb
+++ b/actionpack/lib/action_dispatch/journey/formatter.rb
@@ -1,5 +1,4 @@
 require 'action_controller/metal/exceptions'
-require 'active_support/deprecation'
 
 module ActionDispatch
   module Journey
@@ -81,9 +80,6 @@ module ActionDispatch
           if named_routes.key?(name)
             yield named_routes[name]
           else
-            # Make sure we don't show the deprecation warning more than once
-            warned = false
-
             routes = non_recursive(cache, options)
 
             hash = routes.group_by { |_, r| r.score(options) }
@@ -92,17 +88,6 @@ module ActionDispatch
               break if score < 0
 
               hash[score].sort_by { |i, _| i }.each do |_, route|
-                if name && !warned
-                  ActiveSupport::Deprecation.warn <<-MSG.squish
-                    You are trying to generate the URL for a named route called
-                    #{name.inspect} but no such route was found. In the future,
-                    this will result in an `ActionController::UrlGenerationError`
-                    exception.
-                  MSG
-
-                  warned = true
-                end
-
                 yield route
               end
             end
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index b9e916078c..8b04dfaa45 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -4,11 +4,9 @@ require 'active_support/core_ext/hash/slice'
 require 'active_support/core_ext/enumerable'
 require 'active_support/core_ext/array/extract_options'
 require 'active_support/core_ext/module/remove_method'
-require 'active_support/core_ext/string/filters'
 require 'active_support/inflector'
 require 'action_dispatch/routing/redirection'
 require 'action_dispatch/routing/endpoint'
-require 'active_support/deprecation'
 
 module ActionDispatch
   module Routing
@@ -279,22 +277,8 @@ module ActionDispatch
           end
 
           def split_to(to)
-            case to
-            when Symbol
-              ActiveSupport::Deprecation.warn(<<-MSG.squish)
-                Defining a route where `to` is a symbol is deprecated.
-                Please change `to: :#{to}` to `action: :#{to}`.
-              MSG
-
-              [nil, to.to_s]
-            when /#/    then to.split('#')
-            when String
-              ActiveSupport::Deprecation.warn(<<-MSG.squish)
-                Defining a route where `to` is a controller without an action is deprecated.
-                Please change `to: :#{to}` to `controller: :#{to}`.
-              MSG
-
-              [to, nil]
+            if to =~ /#/
+              to.split('#')
             else
               []
             end
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index d7693bdcee..b4c861d306 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -6,7 +6,6 @@ require 'active_support/core_ext/object/to_query'
 require 'active_support/core_ext/hash/slice'
 require 'active_support/core_ext/module/remove_method'
 require 'active_support/core_ext/array/extract_options'
-require 'active_support/core_ext/string/filters'
 require 'action_controller/metal/exceptions'
 require 'action_dispatch/http/request'
 require 'action_dispatch/routing/endpoint'
@@ -87,7 +86,7 @@ module ActionDispatch
       # named routes.
       class NamedRouteCollection #:nodoc:
         include Enumerable
-        attr_reader :routes, :url_helpers_module
+        attr_reader :routes, :url_helpers_module, :path_helpers_module
 
         def initialize
           @routes  = {}
@@ -102,14 +101,6 @@ module ActionDispatch
           @path_helpers.include?(key) || @url_helpers.include?(key)
         end
 
-        def helpers
-          ActiveSupport::Deprecation.warn(<<-MSG.squish)
-            `named_routes.helpers` is deprecated, please use `route_defined?(route_name)`
-            to see if a named route was defined.
-          MSG
-          @path_helpers + @url_helpers
-        end
-
         def helper_names
           @path_helpers.map(&:to_s) + @url_helpers.map(&:to_s)
         end
@@ -138,7 +129,7 @@ module ActionDispatch
             @url_helpers_module.send  :undef_method, url_name
           end
           routes[key] = route
-          define_url_helper @path_helpers_module, route, path_name, route.defaults, name, LEGACY
+          define_url_helper @path_helpers_module, route, path_name, route.defaults, name, PATH
           define_url_helper @url_helpers_module,  route, url_name,  route.defaults, name, UNKNOWN
 
           @path_helpers << path_name
@@ -170,25 +161,6 @@ module ActionDispatch
           routes.length
         end
 
-        def path_helpers_module(warn = false)
-          if warn
-            mod = @path_helpers_module
-            helpers = @path_helpers
-            Module.new do
-              include mod
-
-              helpers.each do |meth|
-                define_method(meth) do |*args, &block|
-                  ActiveSupport::Deprecation.warn("The method `#{meth}` cannot be used here as a full URL is required. Use `#{meth.to_s.sub(/_path$/, '_url')}` instead")
-                  super(*args, &block)
-                end
-              end
-            end
-          else
-            @path_helpers_module
-          end
-        end
-
         class UrlHelper # :nodoc:
           def self.create(route, options, route_name, url_strategy)
             if optimize_helper?(route)
@@ -271,7 +243,7 @@ module ActionDispatch
             controller_options = t.url_options
             options = controller_options.merge @options
             hash = handle_positional_args(controller_options,
-                                          deprecate_string_options(inner_options) || {},
+                                          inner_options || {},
                                           args,
                                           options,
                                           @segment_keys)
@@ -299,22 +271,6 @@ module ActionDispatch
 
             result.merge!(inner_options)
           end
-
-          DEPRECATED_STRING_OPTIONS = %w[controller action]
-
-          def deprecate_string_options(options)
-            options ||= {}
-            deprecated_string_options = options.keys & DEPRECATED_STRING_OPTIONS
-            if deprecated_string_options.any?
-              msg = "Calling URL helpers with string keys #{deprecated_string_options.join(", ")} is deprecated. Use symbols instead."
-              ActiveSupport::Deprecation.warn(msg)
-              deprecated_string_options.each do |option|
-                value = options.delete(option)
-                options[option.to_sym] = value
-              end
-            end
-            options
-          end
         end
 
         private
@@ -346,34 +302,7 @@ module ActionDispatch
       # :stopdoc:
       # strategy for building urls to send to the client
       PATH    = ->(options) { ActionDispatch::Http::URL.path_for(options) }
-      FULL    = ->(options) { ActionDispatch::Http::URL.full_url_for(options) }
       UNKNOWN = ->(options) { ActionDispatch::Http::URL.url_for(options) }
-      LEGACY  = ->(options) {
-        if options.key?(:only_path)
-          if options[:only_path]
-            ActiveSupport::Deprecation.warn(<<-MSG.squish)
-              You are calling a `*_path` helper with the `only_path` option
-              explicitly set to `true`. This option will stop working on
-              path helpers in Rails 5. Simply remove the `only_path: true`
-              argument from your call as it is redundant when applied to a
-              path helper.
-            MSG
-
-            PATH.call(options)
-          else
-            ActiveSupport::Deprecation.warn(<<-MSG.squish)
-              You are calling a `*_path` helper with the `only_path` option
-              explicitly set to `false`. This option will stop working on
-              path helpers in Rails 5. Use the corresponding `*_url` helper
-              instead.
-            MSG
-
-            FULL.call(options)
-          end
-        else
-          PATH.call(options)
-        end
-      }
       # :startdoc:
 
       attr_accessor :formatter, :set, :named_routes, :default_scope, :router
@@ -508,12 +437,10 @@ module ActionDispatch
 
           if supports_path
             path_helpers = routes.named_routes.path_helpers_module
-          else
-            path_helpers = routes.named_routes.path_helpers_module(true)
-          end
 
-          include path_helpers
-          extend path_helpers
+            include path_helpers
+            extend path_helpers
+          end
 
           # plus a singleton class method called _routes ...
           included do
diff --git a/actionpack/lib/action_dispatch/testing/assertions/dom.rb b/actionpack/lib/action_dispatch/testing/assertions/dom.rb
deleted file mode 100644
index fb579b52fe..0000000000
--- a/actionpack/lib/action_dispatch/testing/assertions/dom.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-require 'active_support/deprecation'
-
-ActiveSupport::Deprecation.warn("ActionDispatch::Assertions::DomAssertions has been extracted to the rails-dom-testing gem.")
\ No newline at end of file
diff --git a/actionpack/lib/action_dispatch/testing/assertions/selector.rb b/actionpack/lib/action_dispatch/testing/assertions/selector.rb
deleted file mode 100644
index 7361e6c44b..0000000000
--- a/actionpack/lib/action_dispatch/testing/assertions/selector.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-require 'active_support/deprecation'
-
-ActiveSupport::Deprecation.warn("ActionDispatch::Assertions::SelectorAssertions has been extracted to the rails-dom-testing gem.")
diff --git a/actionpack/lib/action_dispatch/testing/assertions/tag.rb b/actionpack/lib/action_dispatch/testing/assertions/tag.rb
deleted file mode 100644
index da98b1d6ce..0000000000
--- a/actionpack/lib/action_dispatch/testing/assertions/tag.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-require 'active_support/deprecation'
-
-ActiveSupport::Deprecation.warn('`ActionDispatch::Assertions::TagAssertions` has been extracted to the rails-dom-testing gem.')
diff --git a/actionpack/test/controller/test_case_test.rb b/actionpack/test/controller/test_case_test.rb
index ba2ff7d12c..2e1f21c645 100644
--- a/actionpack/test/controller/test_case_test.rb
+++ b/actionpack/test/controller/test_case_test.rb
@@ -521,18 +521,6 @@ XML
     end
   end
 
-  def test_use_route
-    with_routing do |set|
-      set.draw do
-        get 'via_unnamed_route', to: 'test_case_test/test#test_uri'
-        get 'via_named_route', as: :a_named_route, to: 'test_case_test/test#test_uri'
-      end
-
-      assert_deprecated { get :test_uri, use_route: :a_named_route }
-      assert_equal '/via_named_route', @response.body
-    end
-  end
-
   def test_assert_realistic_path_parameters
     get :test_params, :id => 20, :foo => Object.new
 
@@ -790,19 +778,6 @@ module EngineControllerTests
       assert_equal @response.body, 'bar'
     end
   end
-
-  class BarControllerTestWithHostApplicationRouteSet < ActionController::TestCase
-    tests BarController
-
-    def test_use_route
-      with_routing do |set|
-        set.draw { mount Engine => '/foo' }
-
-        assert_deprecated { get :index, use_route: :foo }
-        assert_equal @response.body, 'bar'
-      end
-    end
-  end
 end
 
 class InferringClassNameTest < ActionController::TestCase
diff --git a/actionpack/test/dispatch/response_test.rb b/actionpack/test/dispatch/response_test.rb
index 48342e252a..c61423dce4 100644
--- a/actionpack/test/dispatch/response_test.rb
+++ b/actionpack/test/dispatch/response_test.rb
@@ -231,9 +231,9 @@ class ResponseTest < ActiveSupport::TestCase
     assert_equal ['Not Found'], body.each.to_a
   end
 
-  test "[response].flatten does not recurse infinitely" do
+  test "[response.to_a].flatten does not recurse infinitely" do
     Timeout.timeout(1) do # use a timeout to prevent it stalling indefinitely
-      status, headers, body = assert_deprecated { [@response].flatten }
+      status, headers, body = [@response.to_a].flatten
       assert_equal @response.status, status
       assert_equal @response.headers, headers
       assert_equal @response.body, body.each.to_a.join
@@ -251,20 +251,6 @@ class ResponseTest < ActiveSupport::TestCase
     status, headers, body = Rack::ContentLength.new(app).call(env)
     assert_equal '5', headers['Content-Length']
   end
-
-  test "implicit destructuring and Array conversion is deprecated" do
-    response = ActionDispatch::Response.new(404, { 'Content-Type' => 'text/plain' }, ['Not Found'])
-
-    assert_deprecated do
-      status, headers, body = response
-
-      assert_equal 404, status
-      assert_equal({ 'Content-Type' => 'text/plain' }, headers)
-      assert_equal ['Not Found'], body.each.to_a
-    end
-
-    assert_deprecated { response.to_ary }
-  end
 end
 
 class ResponseIntegrationTest < ActionDispatch::IntegrationTest
diff --git a/actionpack/test/dispatch/routing/route_set_test.rb b/actionpack/test/dispatch/routing/route_set_test.rb
index 8bdb5733dd..fe52c50336 100644
--- a/actionpack/test/dispatch/routing/route_set_test.rb
+++ b/actionpack/test/dispatch/routing/route_set_test.rb
@@ -105,50 +105,6 @@ module ActionDispatch
         assert_equal 'http://example.com/foo', url_helpers.foo_url(only_path: false)
       end
 
-      test "only_path: true with *_path" do
-        draw do
-          get 'foo', to: SimpleApp.new('foo#index')
-        end
-
-        assert_deprecated do
-          assert_equal '/foo', url_helpers.foo_path(only_path: true)
-        end
-      end
-
-      test "only_path: false with *_path with global :host option" do
-        @set.default_url_options = { host: 'example.com' }
-
-        draw do
-          get 'foo', to: SimpleApp.new('foo#index')
-        end
-
-        assert_deprecated do
-          assert_equal 'http://example.com/foo', url_helpers.foo_path(only_path: false)
-        end
-      end
-
-      test "only_path: false with *_path with local :host option" do
-        draw do
-          get 'foo', to: SimpleApp.new('foo#index')
-        end
-
-        assert_deprecated do
-          assert_equal 'http://example.com/foo', url_helpers.foo_path(only_path: false, host: 'example.com')
-        end
-      end
-
-      test "only_path: false with *_path with no :host option" do
-        draw do
-          get 'foo', to: SimpleApp.new('foo#index')
-        end
-
-        assert_deprecated do
-          assert_raises ArgumentError do
-            assert_equal 'http://example.com/foo', url_helpers.foo_path(only_path: false)
-          end
-        end
-      end
-
       test "explicit keys win over implicit keys" do
         draw do
           resources :foo do
@@ -172,26 +128,6 @@ module ActionDispatch
         assert_equal '/a/users/1', url_helpers.user_path(1, foo: 'a')
       end
 
-      test "stringified controller and action keys are properly symbolized" do
-        draw do
-          root 'foo#bar'
-        end
-
-        assert_deprecated do
-          assert_equal '/', url_helpers.root_path('controller' => 'foo', 'action' => 'bar')
-        end
-      end
-
-      test "mix of string and symbol keys are properly symbolized" do
-        draw do
-          root 'foo#bar'
-        end
-
-        assert_deprecated do
-          assert_equal '/', url_helpers.root_path('controller' => 'foo', :action => 'bar')
-        end
-      end
-
       private
         def draw(&block)
           @set.draw(&block)
diff --git a/actionpack/test/dispatch/routing_test.rb b/actionpack/test/dispatch/routing_test.rb
index aae95fb355..450681c356 100644
--- a/actionpack/test/dispatch/routing_test.rb
+++ b/actionpack/test/dispatch/routing_test.rb
@@ -3331,30 +3331,6 @@ class TestRoutingMapper < ActionDispatch::IntegrationTest
     assert_equal 'comments#index', @response.body
   end
 
-  def test_mix_symbol_to_controller_action
-    assert_deprecated do
-      draw do
-        get '/projects', controller: 'project_files',
-                         action: 'index',
-                         to: :show
-      end
-    end
-    get '/projects'
-    assert_equal 'project_files#show', @response.body
-  end
-
-  def test_mix_string_to_controller_action_no_hash
-    assert_deprecated do
-      draw do
-        get '/projects', controller: 'project_files',
-                         action: 'index',
-                         to: 'show'
-      end
-    end
-    get '/projects'
-    assert_equal 'show#index', @response.body
-  end
-
   def test_shallow_path_and_prefix_are_not_added_to_non_shallow_routes
     draw do
       scope shallow_path: 'projects', shallow_prefix: 'project' do
@@ -3629,15 +3605,13 @@ class TestNamespaceWithControllerOption < ActionDispatch::IntegrationTest
     assert_match(/Missing :controller/, ex.message)
   end
 
-  def test_missing_action
+  def test_missing_controller_with_to
     ex = assert_raises(ArgumentError) {
-      assert_deprecated do
-        draw do
-          get '/foo/bar', :to => 'foo'
-        end
+      draw do
+        get '/foo/bar', :to => 'foo'
       end
     }
-    assert_match(/Missing :action/, ex.message)
+    assert_match(/Missing :controller/, ex.message)
   end
 
   def test_missing_action_on_hash
diff --git a/actionpack/test/routing/helper_test.rb b/actionpack/test/routing/helper_test.rb
index 09ca7ff73b..0028aaa629 100644
--- a/actionpack/test/routing/helper_test.rb
+++ b/actionpack/test/routing/helper_test.rb
@@ -26,20 +26,6 @@ module ActionDispatch
           x.new.pond_duck_path Duck.new
         end
       end
-
-      def test_path_deprecation
-        rs = ::ActionDispatch::Routing::RouteSet.new
-        rs.draw do
-          resources :ducks
-        end
-
-        x = Class.new {
-          include rs.url_helpers(false)
-        }
-        assert_deprecated do
-          assert_equal '/ducks', x.new.ducks_path
-        end
-      end
     end
   end
 end
diff --git a/actionview/CHANGELOG.md b/actionview/CHANGELOG.md
index ec92f21d81..ab3cb7eb19 100644
--- a/actionview/CHANGELOG.md
+++ b/actionview/CHANGELOG.md
@@ -1,3 +1,14 @@
+*   Change the default template handler from `ERB` to `Raw`.
+
+    Files without a template handler in their extension will be rended using the raw
+    handler instead of ERB.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `AbstractController::Base::parent_prefixes`.
+
+    *Rafael Mendonça França*
+
 *   Default translations that have a lower precedence than a html safe default,
     but are not themselves safe, should not be marked as html_safe.
 
diff --git a/actionview/lib/action_view/template/handlers.rb b/actionview/lib/action_view/template/handlers.rb
index 9e61ea4225..0105e88a49 100644
--- a/actionview/lib/action_view/template/handlers.rb
+++ b/actionview/lib/action_view/template/handlers.rb
@@ -7,9 +7,9 @@ module ActionView #:nodoc:
       autoload :Raw, 'action_view/template/handlers/raw'
 
       def self.extended(base)
-        base.register_default_template_handler :erb, ERB.new
+        base.register_default_template_handler :raw, Raw.new
+        base.register_template_handler :erb, ERB.new
         base.register_template_handler :builder, Builder.new
-        base.register_template_handler :raw, Raw.new
         base.register_template_handler :ruby, :source.to_proc
       end
 
diff --git a/actionview/lib/action_view/template/resolver.rb b/actionview/lib/action_view/template/resolver.rb
index 29d2e9ca90..7fc14b89ee 100644
--- a/actionview/lib/action_view/template/resolver.rb
+++ b/actionview/lib/action_view/template/resolver.rb
@@ -1,7 +1,6 @@
 require "pathname"
 require "active_support/core_ext/class"
 require "active_support/core_ext/module/attribute_accessors"
-require 'active_support/core_ext/string/filters'
 require "action_view/template"
 require "thread"
 require "thread_safe"
@@ -251,12 +250,6 @@ module ActionView
       pieces.shift
 
       extension = pieces.pop
-      unless extension
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          The file #{path} did not specify a template handler. The default is
-          currently ERB, but will change to RAW in the future.
-        MSG
-      end
 
       handler = Template.handler_for_extension(extension)
       format, variant = pieces.last.split(EXTENSIONS[:variants], 2) if pieces.last
diff --git a/actionview/lib/action_view/view_paths.rb b/actionview/lib/action_view/view_paths.rb
index 2e203a7590..492f67f45d 100644
--- a/actionview/lib/action_view/view_paths.rb
+++ b/actionview/lib/action_view/view_paths.rb
@@ -16,14 +16,9 @@ module ActionView
     module ClassMethods
       def _prefixes # :nodoc:
         @_prefixes ||= begin
-          deprecated_prefixes = handle_deprecated_parent_prefixes
-          if deprecated_prefixes
-            deprecated_prefixes
-          else
-            return local_prefixes if superclass.abstract?
-
-            local_prefixes + superclass._prefixes
-          end
+          return local_prefixes if superclass.abstract?
+
+          local_prefixes + superclass._prefixes
         end
       end
 
@@ -34,17 +29,6 @@ module ActionView
       def local_prefixes
         [controller_path]
       end
-
-      def handle_deprecated_parent_prefixes # TODO: remove in 4.3/5.0.
-        return unless respond_to?(:parent_prefixes)
-
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          Overriding `ActionController::Base::parent_prefixes` is deprecated,
-          override `.local_prefixes` instead.
-        MSG
-
-        local_prefixes + parent_prefixes
-      end
     end
 
     # The prefixes used in render "foo" shortcuts.
diff --git a/actionview/test/actionpack/abstract/abstract_controller_test.rb b/actionview/test/actionpack/abstract/abstract_controller_test.rb
index e653b12d32..fac0a1fbb7 100644
--- a/actionview/test/actionpack/abstract/abstract_controller_test.rb
+++ b/actionview/test/actionpack/abstract/abstract_controller_test.rb
@@ -182,22 +182,6 @@ module AbstractController
       end
     end
 
-    class DeprecatedParentPrefixes < OverridingLocalPrefixes
-      def self.parent_prefixes
-        ["abstract_controller/testing/me3"]
-      end
-    end
-
-    class DeprecatedParentPrefixesTest < ActiveSupport::TestCase # TODO: remove me in 5.0/4.3.
-      test "overriding .parent_prefixes is deprecated" do
-        @controller = DeprecatedParentPrefixes.new
-        assert_deprecated do
-          @controller.process(:index)
-        end
-        assert_equal "Hello from me3/index.erb", @controller.response_body
-      end
-    end
-
     # Test rendering with layouts
     # ====
     # self._layout is used when defined
diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index d643a08235..f86b4804c8 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,8 @@
+*   Remove deprecated `ActiveModel::Dirty#reset_#{attribute}` and
+    `ActiveModel::Dirty#reset_changes`.
+
+    *Rafael Mendonça França*
+
 *   Change the way in which callback chains can be halted.
 
     The preferred method to halt a callback chain from now on is to explicitly
diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb
index 094424e4fd..afba9bab0d 100644
--- a/activemodel/lib/active_model/dirty.rb
+++ b/activemodel/lib/active_model/dirty.rb
@@ -1,6 +1,5 @@
 require 'active_support/hash_with_indifferent_access'
 require 'active_support/core_ext/object/duplicable'
-require 'active_support/core_ext/string/filters'
 
 module ActiveModel
   # == Active \Model \Dirty
@@ -116,7 +115,6 @@ module ActiveModel
 
     included do
       attribute_method_suffix '_changed?', '_change', '_will_change!', '_was'
-      attribute_method_affix prefix: 'reset_', suffix: '!'
       attribute_method_affix prefix: 'restore_', suffix: '!'
     end
 
@@ -204,15 +202,6 @@ module ActiveModel
         @changed_attributes = ActiveSupport::HashWithIndifferentAccess.new
       end
 
-      def reset_changes
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          `#reset_changes` is deprecated and will be removed on Rails 5.
-          Please use `#clear_changes_information` instead.
-        MSG
-
-        clear_changes_information
-      end
-
       # Handle <tt>*_change</tt> for +method_missing+.
       def attribute_change(attr)
         [changed_attributes[attr], __send__(attr)] if attribute_changed?(attr)
@@ -231,16 +220,6 @@ module ActiveModel
         set_attribute_was(attr, value)
       end
 
-      # Handle <tt>reset_*!</tt> for +method_missing+.
-      def reset_attribute!(attr)
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          `#reset_#{attr}!` is deprecated and will be removed on Rails 5.
-          Please use `#restore_#{attr}!` instead.
-        MSG
-
-        restore_attribute!(attr)
-      end
-
       # Handle <tt>restore_*!</tt> for +method_missing+.
       def restore_attribute!(attr)
         if attribute_changed?(attr)
diff --git a/activemodel/test/cases/dirty_test.rb b/activemodel/test/cases/dirty_test.rb
index db2cd885e2..8ffd62fd86 100644
--- a/activemodel/test/cases/dirty_test.rb
+++ b/activemodel/test/cases/dirty_test.rb
@@ -181,23 +181,6 @@ class DirtyTest < ActiveModel::TestCase
     assert_equal ActiveSupport::HashWithIndifferentAccess.new, @model.changed_attributes
   end
 
-  test "reset_changes is deprecated" do
-    @model.name = 'Dmitry'
-    @model.name_changed?
-    @model.save
-    @model.name = 'Bob'
-
-    assert_equal [nil, 'Dmitry'], @model.previous_changes['name']
-    assert_equal 'Dmitry', @model.changed_attributes['name']
-
-    assert_deprecated do
-      @model.deprecated_reload
-    end
-
-    assert_equal ActiveSupport::HashWithIndifferentAccess.new, @model.previous_changes
-    assert_equal ActiveSupport::HashWithIndifferentAccess.new, @model.changed_attributes
-  end
-
   test "restore_attributes should restore all previous data" do
     @model.name = 'Dmitry'
     @model.color = 'Red'
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 83224c522c..d1eee8e73e 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,67 @@
+*   Change the behavior of boolean columns to be closer to Ruby's semantics.
+
+    Before this change we had a small set of "truthy", and all others are "falsy".
+
+    Now, we have a small set of "falsy" values and all others are "truthy" matching
+    Ruby's semantics.
+
+    *Rafael Mendonça França*
+
+*   Deprecate `ActiveRecord::Base.errors_in_transactional_callbacks=`.
+
+    *Rafael Mendonça França*
+
+*   Change transaction callbacks to not swallowing errors.
+
+    Before this change any error raised inside a transaction callback are
+    rescued and printed in the logs.
+
+    Now these errors are not rescue anymore and just bubble up, as the other callbacks.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `sanitize_sql_hash_for_conditions`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `Reflection#source_macro`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `symbolized_base_class` and `symbolized_sti_name`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `ActiveRecord::Base.disable_implicit_join_references=`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated access to connection specification using a string acessor.
+
+    Now all strings will be handled as a URL.
+
+    *Rafael Mendonça França*
+
+*   Change the default `null` value for `timestamps` to `false`.
+
+    *Rafael Mendonça França*
+
+*   Return an array of pools from `connection_pools`.
+
+    *Rafael Mendonça França*
+
+*   Return a null column from `column_for_attribute` when no column exists.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `serialized_attributes`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated automatic counter caches on `has_many :through`.
+
+    *Rafael Mendonça França*
+
 *   Change the way in which callback chains can be halted.
 
     The preferred method to halt a callback chain from now on is to explicitly
diff --git a/activerecord/lib/active_record/associations/has_many_through_association.rb b/activerecord/lib/active_record/associations/has_many_through_association.rb
index 7a050ca224..f1e784d771 100644
--- a/activerecord/lib/active_record/associations/has_many_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_through_association.rb
@@ -1,5 +1,3 @@
-require 'active_support/core_ext/string/filters'
-
 module ActiveRecord
   # = Active Record Has Many Through Association
   module Associations
@@ -49,16 +47,7 @@ module ActiveRecord
         end
 
         save_through_record(record)
-        if has_cached_counter? && !through_reflection_updates_counter_cache?
-          ActiveSupport::Deprecation.warn(<<-MSG.squish)
-            Automatic updating of counter caches on through associations has been
-            deprecated, and will be removed in Rails 5. Instead, please set the
-            appropriate `counter_cache` options on the `has_many` and `belongs_to`
-            for your associations to #{through_reflection.name}.
-          MSG
 
-          update_counter_in_database(1)
-        end
         record
       end
 
@@ -211,11 +200,6 @@ module ActiveRecord
         def invertible_for?(record)
           false
         end
-
-        def through_reflection_updates_counter_cache?
-          counter_name = cached_counter_attribute_name
-          inverse_updates_counter_named?(counter_name, through_reflection)
-        end
     end
   end
 end
diff --git a/activerecord/lib/active_record/associations/preloader/association.rb b/activerecord/lib/active_record/associations/preloader/association.rb
index a6e1a24360..afcaa5d55a 100644
--- a/activerecord/lib/active_record/associations/preloader/association.rb
+++ b/activerecord/lib/active_record/associations/preloader/association.rb
@@ -104,11 +104,11 @@ module ActiveRecord
         end
 
         def association_key_type
-          @klass.type_for_attribute(association_key_name.to_s).type
+          @klass.column_for_attribute(association_key_name).type
         end
 
         def owner_key_type
-          @model.type_for_attribute(owner_key_name.to_s).type
+          @model.column_for_attribute(owner_key_name).type
         end
 
         def load_slices(slices)
diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index b7edac791e..8f165fb1dc 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -192,7 +192,8 @@ module ActiveRecord
       end
 
       # Returns the column object for the named attribute.
-      # Returns nil if the named attribute does not exist.
+      # Returns a +ActiveRecord::ConnectionAdapters::NullColumn+ if the
+      # named attribute does not exist.
       #
       #   class Person < ActiveRecord::Base
       #   end
@@ -202,17 +203,12 @@ module ActiveRecord
       #   # => #<ActiveRecord::ConnectionAdapters::Column:0x007ff4ab083980 @name="name", @sql_type="varchar(255)", @null=true, ...>
       #
       #   person.column_for_attribute(:nothing)
-      #   # => nil
+      #   # => #<ActiveRecord::ConnectionAdapters::NullColumn:0xXXX @name=nil, @sql_type=nil, @cast_type=#<Type::Value>, ...>
       def column_for_attribute(name)
-        column = columns_hash[name.to_s]
-        if column.nil?
-          ActiveSupport::Deprecation.warn(<<-MSG.squish)
-            `#column_for_attribute` will return a null object for non-existent
-            columns in Rails 5. Use `#has_attribute?` if you need to check for
-            an attribute's existence.
-          MSG
+        name = name.to_s
+        columns_hash.fetch(name) do
+          ConnectionAdapters::NullColumn.new(name)
         end
-        column
       end
     end
 
diff --git a/activerecord/lib/active_record/attribute_methods/read.rb b/activerecord/lib/active_record/attribute_methods/read.rb
index 20f0936e52..f6ab543015 100644
--- a/activerecord/lib/active_record/attribute_methods/read.rb
+++ b/activerecord/lib/active_record/attribute_methods/read.rb
@@ -36,19 +36,8 @@ module ActiveRecord
       extend ActiveSupport::Concern
 
       module ClassMethods
-        [:cache_attributes, :cached_attributes, :cache_attribute?].each do |method_name|
-          define_method method_name do |*|
-            cached_attributes_deprecation_warning(method_name)
-            true
-          end
-        end
-
         protected
 
-        def cached_attributes_deprecation_warning(method_name)
-          ActiveSupport::Deprecation.warn "Calling `#{method_name}` is no longer necessary. All attributes are cached."
-        end
-
         if Module.methods_transplantable?
           def define_method_attribute(name)
             method = ReaderMethodCache[name]
diff --git a/activerecord/lib/active_record/attribute_methods/serialization.rb b/activerecord/lib/active_record/attribute_methods/serialization.rb
index e5ec5ddca5..d0d8a968c5 100644
--- a/activerecord/lib/active_record/attribute_methods/serialization.rb
+++ b/activerecord/lib/active_record/attribute_methods/serialization.rb
@@ -1,5 +1,3 @@
-require 'active_support/core_ext/string/filters'
-
 module ActiveRecord
   module AttributeMethods
     module Serialization
@@ -51,19 +49,6 @@ module ActiveRecord
             Type::Serialized.new(type, coder)
           end
         end
-
-        def serialized_attributes
-          ActiveSupport::Deprecation.warn(<<-MSG.squish)
-            `serialized_attributes` is deprecated without replacement, and will
-            be removed in Rails 5.0.
-          MSG
-
-          @serialized_attributes ||= Hash[
-            columns.select { |t| t.cast_type.is_a?(Type::Serialized) }.map { |c|
-              [c.name, c.cast_type.coder]
-            }
-          ]
-        end
       end
     end
   end
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
index 6235745fb2..1371317e3c 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
@@ -2,7 +2,6 @@ require 'thread'
 require 'thread_safe'
 require 'monitor'
 require 'set'
-require 'active_support/core_ext/string/filters'
 
 module ActiveRecord
   # Raised when a connection could not be obtained within the connection
@@ -517,15 +516,7 @@ module ActiveRecord
       def connection_pool_list
         owner_to_pool.values.compact
       end
-
-      def connection_pools
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          In the next release, this will return the same as `#connection_pool_list`.
-          (An array of pools, rather than a hash mapping specs to pools.)
-        MSG
-
-        Hash[connection_pool_list.map { |pool| [pool.spec, pool] }]
-      end
+      alias :connection_pools :connection_pool_list
 
       def establish_connection(owner, spec)
         @class_to_pool.clear
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
index 68d8a2cd6a..7eaa89c9a7 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb
@@ -56,18 +56,6 @@ module ActiveRecord
       end
     end
 
-    module TimestampDefaultDeprecation # :nodoc:
-      def emit_warning_if_null_unspecified(options)
-        return if options.key?(:null)
-
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          `#timestamp` was called without specifying an option for `null`. In Rails 5,
-          this behavior will change to `null: false`. You should manually specify
-         `null: true` to prevent the behavior of your existing migrations from changing.
-        MSG
-      end
-    end
-
     class ReferenceDefinition # :nodoc:
       def initialize(
         name,
@@ -167,8 +155,6 @@ module ActiveRecord
     # The table definitions
     # The Columns are stored as a ColumnDefinition in the +columns+ attribute.
     class TableDefinition
-      include TimestampDefaultDeprecation
-
       # An array of ColumnDefinition objects, representing the column changes
       # that have been defined.
       attr_accessor :indexes
@@ -375,7 +361,9 @@ module ActiveRecord
       #   t.timestamps null: false
       def timestamps(*args)
         options = args.extract_options!
-        emit_warning_if_null_unspecified(options)
+
+        options[:null] = false if options[:null].nil?
+
         column(:created_at, :datetime, options)
         column(:updated_at, :datetime, options)
       end
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
index 34d60493ea..0f44c332ae 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -851,14 +851,14 @@ module ActiveRecord
         columns
       end
 
-      include TimestampDefaultDeprecation
       # Adds timestamps (+created_at+ and +updated_at+) columns to +table_name+.
       # Additional options (like <tt>null: false</tt>) are forwarded to #add_column.
       #
       #   add_timestamps(:suppliers, null: false)
       #
       def add_timestamps(table_name, options = {})
-        emit_warning_if_null_unspecified(options)
+        options[:null] = false if options[:null].nil?
+
         add_column table_name, :created_at, :datetime, options
         add_column table_name, :updated_at, :datetime, options
       end
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb b/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb
index fd666c8c39..f6ef3b0675 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb
@@ -69,12 +69,7 @@ module ActiveRecord
       def rollback_records
         ite = records.uniq
         while record = ite.shift
-          begin
-            record.rolledback! full_rollback?
-          rescue => e
-            raise if ActiveRecord::Base.raise_in_transactional_callbacks
-            record.logger.error(e) if record.respond_to?(:logger) && record.logger
-          end
+          record.rolledback! full_rollback?
         end
       ensure
         ite.each do |i|
@@ -89,12 +84,7 @@ module ActiveRecord
       def commit_records
         ite = records.uniq
         while record = ite.shift
-          begin
-            record.committed!
-          rescue => e
-            raise if ActiveRecord::Base.raise_in_transactional_callbacks
-            record.logger.error(e) if record.respond_to?(:logger) && record.logger
-          end
+          record.committed!
         end
       ensure
         ite.each do |i|
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index fa24d9b43f..c3a8bf5c74 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -25,7 +25,6 @@ module ActiveRecord
       autoload :TableDefinition
       autoload :Table
       autoload :AlterTable
-      autoload :TimestampDefaultDeprecation
     end
 
     autoload_at 'active_record/connection_adapters/abstract/connection_pool' do
diff --git a/activerecord/lib/active_record/connection_adapters/column.rb b/activerecord/lib/active_record/connection_adapters/column.rb
index 65d8b1a8ab..e74de60a83 100644
--- a/activerecord/lib/active_record/connection_adapters/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/column.rb
@@ -5,7 +5,6 @@ module ActiveRecord
   module ConnectionAdapters
     # An abstract definition of a column in a table.
     class Column
-      TRUE_VALUES = [true, 1, '1', 't', 'T', 'true', 'TRUE', 'on', 'ON'].to_set
       FALSE_VALUES = [false, 0, '0', 'f', 'F', 'false', 'FALSE', 'off', 'OFF'].to_set
 
       module Format
@@ -77,6 +76,12 @@ module ActiveRecord
         [self.class, name, default, cast_type, sql_type, null, default_function]
       end
     end
+
+    class NullColumn < Column
+      def initialize(name)
+        super name, nil, Type::Value.new
+      end
+    end
   end
   # :startdoc:
 end
diff --git a/activerecord/lib/active_record/connection_adapters/connection_specification.rb b/activerecord/lib/active_record/connection_adapters/connection_specification.rb
index e54e3199ff..08d46fca96 100644
--- a/activerecord/lib/active_record/connection_adapters/connection_specification.rb
+++ b/activerecord/lib/active_record/connection_adapters/connection_specification.rb
@@ -1,5 +1,4 @@
 require 'uri'
-require 'active_support/core_ext/string/filters'
 
 module ActiveRecord
   module ConnectionAdapters
@@ -210,30 +209,12 @@ module ActiveRecord
           when Symbol
             resolve_symbol_connection spec
           when String
-            resolve_string_connection spec
+            resolve_url_connection spec
           when Hash
             resolve_hash_connection spec
           end
         end
 
-        def resolve_string_connection(spec)
-          # Rails has historically accepted a string to mean either
-          # an environment key or a URL spec, so we have deprecated
-          # this ambiguous behaviour and in the future this function
-          # can be removed in favor of resolve_url_connection.
-          if configurations.key?(spec) || spec !~ /:/
-            ActiveSupport::Deprecation.warn(<<-MSG.squish)
-              Passing a string to ActiveRecord::Base.establish_connection for a
-              configuration lookup is deprecated, please pass a symbol
-              (#{spec.to_sym.inspect}) instead.
-            MSG
-
-            resolve_symbol_connection(spec)
-          else
-            resolve_url_connection(spec)
-          end
-        end
-
         # Takes the environment such as +:production+ or +:development+.
         # This requires that the @configurations was initialized with a key that
         # matches.
diff --git a/activerecord/lib/active_record/core.rb b/activerecord/lib/active_record/core.rb
index 38b2d632d2..5c7c0feeb7 100644
--- a/activerecord/lib/active_record/core.rb
+++ b/activerecord/lib/active_record/core.rb
@@ -87,13 +87,6 @@ module ActiveRecord
 
       mattr_accessor :maintain_test_schema, instance_accessor: false
 
-      def self.disable_implicit_join_references=(value)
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          Implicit join references were removed with Rails 4.1.
-          Make sure to remove this configuration because it does nothing.
-        MSG
-      end
-
       class_attribute :default_connection_handler, instance_writer: false
       class_attribute :find_by_statement_cache
 
diff --git a/activerecord/lib/active_record/fixtures.rb b/activerecord/lib/active_record/fixtures.rb
index 4732462b05..3c71936c3b 100644
--- a/activerecord/lib/active_record/fixtures.rb
+++ b/activerecord/lib/active_record/fixtures.rb
@@ -768,12 +768,6 @@ module ActiveRecord
 
   end
 
-  #--
-  # Deprecate 'Fixtures' in favor of 'FixtureSet'.
-  #++
-  # :nodoc:
-  Fixtures = ActiveSupport::Deprecation::DeprecatedConstantProxy.new('ActiveRecord::Fixtures', 'ActiveRecord::FixtureSet')
-
   class Fixture #:nodoc:
     include Enumerable
 
diff --git a/activerecord/lib/active_record/inheritance.rb b/activerecord/lib/active_record/inheritance.rb
index b91e9ac137..fd1e22349b 100644
--- a/activerecord/lib/active_record/inheritance.rb
+++ b/activerecord/lib/active_record/inheritance.rb
@@ -79,16 +79,6 @@ module ActiveRecord
         :true == (@finder_needs_type_condition ||= descends_from_active_record? ? :false : :true)
       end
 
-      def symbolized_base_class
-        ActiveSupport::Deprecation.warn('`ActiveRecord::Base.symbolized_base_class` is deprecated and will be removed without replacement.')
-        @symbolized_base_class ||= base_class.to_s.to_sym
-      end
-
-      def symbolized_sti_name
-        ActiveSupport::Deprecation.warn('`ActiveRecord::Base.symbolized_sti_name` is deprecated and will be removed without replacement.')
-        @symbolized_sti_name ||= sti_name.present? ? sti_name.to_sym : symbolized_base_class
-      end
-
       # Returns the class descending directly from ActiveRecord::Base, or
       # an abstract class, if any, in the inheritance hierarchy.
       #
diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb
index 7696ef13c7..66f2b6b768 100644
--- a/activerecord/lib/active_record/reflection.rb
+++ b/activerecord/lib/active_record/reflection.rb
@@ -153,15 +153,6 @@ module ActiveRecord
         JoinKeys.new(foreign_key, active_record_primary_key)
       end
 
-      def source_macro
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          ActiveRecord::Base.source_macro is deprecated and will be removed
-          without replacement.
-        MSG
-
-        macro
-      end
-
       def constraints
         scope_chain.flatten
       end
@@ -763,16 +754,6 @@ module ActiveRecord
         source_reflection.join_keys(association_klass)
       end
 
-      # The macro used by the source association
-      def source_macro
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          ActiveRecord::Base.source_macro is deprecated and will be removed
-          without replacement.
-        MSG
-
-        source_reflection.source_macro
-      end
-
       # A through association is nested if there would be more than one join table
       def nested?
         chain.length > 2
diff --git a/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb b/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb
index 4b5f5773a0..95dbd6a77f 100644
--- a/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb
@@ -1,5 +1,3 @@
-require 'active_support/core_ext/string/filters'
-
 module ActiveRecord
   class PredicateBuilder
     class ArrayHandler # :nodoc:
diff --git a/activerecord/lib/active_record/sanitization.rb b/activerecord/lib/active_record/sanitization.rb
index f5aa60a69a..768a72a947 100644
--- a/activerecord/lib/active_record/sanitization.rb
+++ b/activerecord/lib/active_record/sanitization.rb
@@ -72,35 +72,6 @@ module ActiveRecord
         expanded_attrs
       end
 
-      # Sanitizes a hash of attribute/value pairs into SQL conditions for a WHERE clause.
-      #   { name: "foo'bar", group_id: 4 }
-      #     # => "name='foo''bar' and group_id= 4"
-      #   { status: nil, group_id: [1,2,3] }
-      #     # => "status IS NULL and group_id IN (1,2,3)"
-      #   { age: 13..18 }
-      #     # => "age BETWEEN 13 AND 18"
-      #   { 'other_records.id' => 7 }
-      #     # => "`other_records`.`id` = 7"
-      #   { other_records: { id: 7 } }
-      #     # => "`other_records`.`id` = 7"
-      # And for value objects on a composed_of relationship:
-      #   { address: Address.new("123 abc st.", "chicago") }
-      #     # => "address_street='123 abc st.' and address_city='chicago'"
-      def sanitize_sql_hash_for_conditions(attrs, default_table_name = self.table_name)
-        table = Arel::Table.new(table_name).alias(default_table_name)
-        predicate_builder = PredicateBuilder.new(TableMetadata.new(self, table))
-        ActiveSupport::Deprecation.warn(<<-EOWARN)
-sanitize_sql_hash_for_conditions is deprecated, and will be removed in Rails 5.0
-        EOWARN
-        attrs = predicate_builder.resolve_column_aliases(attrs)
-        attrs = expand_hash_conditions_for_aggregates(attrs)
-
-        predicate_builder.build_from_hash(attrs).map { |b|
-          connection.visitor.compile b
-        }.join(' AND ')
-      end
-      alias_method :sanitize_sql_hash, :sanitize_sql_hash_for_conditions
-
       # Sanitizes a hash of attribute/value pairs into SQL conditions for a SET clause.
       #   { status: nil, group_id: 1 }
       #     # => "status = NULL , group_id = 1"
diff --git a/activerecord/lib/active_record/transactions.rb b/activerecord/lib/active_record/transactions.rb
index 31ca90fb58..1c48196762 100644
--- a/activerecord/lib/active_record/transactions.rb
+++ b/activerecord/lib/active_record/transactions.rb
@@ -4,23 +4,10 @@ module ActiveRecord
     extend ActiveSupport::Concern
     #:nodoc:
     ACTIONS = [:create, :destroy, :update]
-    #:nodoc:
-    CALLBACK_WARN_MESSAGE = "Currently, Active Record suppresses errors raised " \
-      "within `after_rollback`/`after_commit` callbacks and only print them to " \
-      "the logs. In the next version, these errors will no longer be suppressed. " \
-      "Instead, the errors will propagate normally just like in other Active " \
-      "Record callbacks.\n" \
-      "\n" \
-      "You can opt into the new behavior and remove this warning by setting:\n" \
-      "\n" \
-      "  config.active_record.raise_in_transactional_callbacks = true\n\n"
 
     included do
       define_callbacks :commit, :rollback,
                        scope: [:kind, :name]
-
-      mattr_accessor :raise_in_transactional_callbacks, instance_writer: false
-      self.raise_in_transactional_callbacks = false
     end
 
     # = Active Record Transactions
@@ -236,9 +223,6 @@ module ActiveRecord
       def after_commit(*args, &block)
         set_options_for_callbacks!(args)
         set_callback(:commit, :after, *args, &block)
-        unless ActiveRecord::Base.raise_in_transactional_callbacks
-          ActiveSupport::Deprecation.warn(CALLBACK_WARN_MESSAGE)
-        end
       end
 
       # This callback is called after a create, update, or destroy are rolled back.
@@ -247,9 +231,16 @@ module ActiveRecord
       def after_rollback(*args, &block)
         set_options_for_callbacks!(args)
         set_callback(:rollback, :after, *args, &block)
-        unless ActiveRecord::Base.raise_in_transactional_callbacks
-          ActiveSupport::Deprecation.warn(CALLBACK_WARN_MESSAGE)
-        end
+      end
+
+      def raise_in_transactional_callbacks
+        ActiveSupport::Deprecation.warn('ActiveRecord::Base.raise_in_transactional_callbacks is deprecated and will be removed without replacement.')
+        true
+      end
+
+      def raise_in_transactional_callbacks=(value)
+        ActiveSupport::Deprecation.warn('ActiveRecord::Base.raise_in_transactional_callbacks= is deprecated, has no effect and will be removed without replacement.')
+        value
       end
 
       private
diff --git a/activerecord/lib/active_record/type/boolean.rb b/activerecord/lib/active_record/type/boolean.rb
index 978d16d524..2e24afc7c0 100644
--- a/activerecord/lib/active_record/type/boolean.rb
+++ b/activerecord/lib/active_record/type/boolean.rb
@@ -10,19 +10,10 @@ module ActiveRecord
       def cast_value(value)
         if value == ''
           nil
-        elsif ConnectionAdapters::Column::TRUE_VALUES.include?(value)
-          true
-        else
-          if !ConnectionAdapters::Column::FALSE_VALUES.include?(value)
-            ActiveSupport::Deprecation.warn(<<-MSG.squish)
-              You attempted to assign a value which is not explicitly `true` or `false`
-              to a boolean column. Currently this value casts to `false`. This will
-              change to match Ruby's semantics, and will cast to `true` in Rails 5.
-              If you would like to maintain the current behavior, you should
-              explicitly handle the values you would like cast to `false`.
-            MSG
-          end
+        elsif ConnectionAdapters::Column::FALSE_VALUES.include?(value)
           false
+        else
+          true
         end
       end
     end
diff --git a/activerecord/lib/rails/generators/active_record/migration/templates/create_table_migration.rb b/activerecord/lib/rails/generators/active_record/migration/templates/create_table_migration.rb
index f7bf6987c4..fd94a2d038 100644
--- a/activerecord/lib/rails/generators/active_record/migration/templates/create_table_migration.rb
+++ b/activerecord/lib/rails/generators/active_record/migration/templates/create_table_migration.rb
@@ -9,7 +9,7 @@ class <%= migration_class_name %> < ActiveRecord::Migration
 <% end -%>
 <% end -%>
 <% if options[:timestamps] %>
-      t.timestamps null: false
+      t.timestamps
 <% end -%>
     end
 <% attributes_with_index.each do |attribute| -%>
diff --git a/activerecord/test/cases/ar_schema_test.rb b/activerecord/test/cases/ar_schema_test.rb
index 025c9fe6f9..f4e8003bc3 100644
--- a/activerecord/test/cases/ar_schema_test.rb
+++ b/activerecord/test/cases/ar_schema_test.rb
@@ -93,69 +93,38 @@ if ActiveRecord::Base.connection.supports_migrations?
       assert_equal "20131219224947", ActiveRecord::SchemaMigration.normalize_migration_number("20131219224947")
     end
 
-    def test_timestamps_without_null_is_deprecated_on_create_table
-      assert_deprecated do
-        ActiveRecord::Schema.define do
-          create_table :has_timestamps do |t|
-            t.timestamps
-          end
+    def test_timestamps_without_null_set_null_to_false_on_create_table
+      ActiveRecord::Schema.define do
+        create_table :has_timestamps do |t|
+          t.timestamps
         end
       end
+
+      assert !@connection.columns(:has_timestamps).find { |c| c.name == 'created_at' }.null
+      assert !@connection.columns(:has_timestamps).find { |c| c.name == 'updated_at' }.null
     end
 
-    def test_timestamps_without_null_is_deprecated_on_change_table
-      assert_deprecated do
-        ActiveRecord::Schema.define do
-          create_table :has_timestamps
+    def test_timestamps_without_null_set_null_to_false_on_change_table
+      ActiveRecord::Schema.define do
+        create_table :has_timestamps
 
-          change_table :has_timestamps do |t|
-            t.timestamps
-          end
+        change_table :has_timestamps do |t|
+          t.timestamps default: Time.now
         end
       end
-    end
 
-    def test_timestamps_without_null_is_deprecated_on_add_timestamps
-      assert_deprecated do
-        ActiveRecord::Schema.define do
-          create_table :has_timestamps
-          add_timestamps :has_timestamps
-        end
-      end
+      assert !@connection.columns(:has_timestamps).find { |c| c.name == 'created_at' }.null
+      assert !@connection.columns(:has_timestamps).find { |c| c.name == 'updated_at' }.null
     end
 
-    def test_no_deprecation_warning_from_timestamps_on_create_table
-      assert_not_deprecated do
-        ActiveRecord::Schema.define do
-          create_table :has_timestamps do |t|
-            t.timestamps null: true
-          end
-
-          drop_table :has_timestamps
-
-          create_table :has_timestamps do |t|
-            t.timestamps null: false
-          end
-        end
+    def test_timestamps_without_null_set_null_to_false_on_add_timestamps
+      ActiveRecord::Schema.define do
+        create_table :has_timestamps
+        add_timestamps :has_timestamps, default: Time.now
       end
-    end
-
-    def test_no_deprecation_warning_from_timestamps_on_change_table
-      assert_not_deprecated do
-        ActiveRecord::Schema.define do
-          create_table :has_timestamps
-          change_table :has_timestamps do |t|
-            t.timestamps null: true
-          end
 
-          drop_table :has_timestamps
-
-          create_table :has_timestamps
-          change_table :has_timestamps do |t|
-            t.timestamps null: false, default: Time.now
-          end
-        end
-      end
+      assert !@connection.columns(:has_timestamps).find { |c| c.name == 'created_at' }.null
+      assert !@connection.columns(:has_timestamps).find { |c| c.name == 'updated_at' }.null
     end
   end
 end
diff --git a/activerecord/test/cases/associations/deprecated_counter_cache_on_has_many_through_test.rb b/activerecord/test/cases/associations/deprecated_counter_cache_on_has_many_through_test.rb
deleted file mode 100644
index 48f7ddbe83..0000000000
--- a/activerecord/test/cases/associations/deprecated_counter_cache_on_has_many_through_test.rb
+++ /dev/null
@@ -1,26 +0,0 @@
-require "cases/helper"
-
-class DeprecatedCounterCacheOnHasManyThroughTest < ActiveRecord::TestCase
-  class Post < ActiveRecord::Base
-    has_many :taggings, as: :taggable
-    has_many :tags, through: :taggings
-  end
-
-  class Tagging < ActiveRecord::Base
-    belongs_to :taggable, polymorphic: true
-    belongs_to :tag
-  end
-
-  class Tag < ActiveRecord::Base
-  end
-
-  test "counter caches are updated in the database if the belongs_to association doesn't specify a counter cache" do
-    post = Post.create!(title: 'Hello', body: 'World!')
-    assert_deprecated { post.tags << Tag.create!(name: 'whatever') }
-
-    assert_equal 1, post.tags.size
-    assert_equal 1, post.tags_count
-    assert_equal 1, post.reload.tags.size
-    assert_equal 1, post.reload.tags_count
-  end
-end
diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index 731d433706..feb1fca500 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -531,20 +531,6 @@ class AttributeMethodsTest < ActiveRecord::TestCase
     end
   end
 
-  def test_deprecated_cache_attributes
-    assert_deprecated do
-      Topic.cache_attributes :replies_count
-    end
-
-    assert_deprecated do
-      Topic.cached_attributes
-    end
-
-    assert_deprecated do
-      Topic.cache_attribute? :replies_count
-    end
-  end
-
   def test_converted_values_are_returned_after_assignment
     developer = Developer.new(name: 1337, salary: "50000")
 
diff --git a/activerecord/test/cases/connection_adapters/connection_handler_test.rb b/activerecord/test/cases/connection_adapters/connection_handler_test.rb
index 3e33b30144..b72f8ca88c 100644
--- a/activerecord/test/cases/connection_adapters/connection_handler_test.rb
+++ b/activerecord/test/cases/connection_adapters/connection_handler_test.rb
@@ -44,9 +44,7 @@ module ActiveRecord
       end
 
       def test_connection_pools
-        assert_deprecated do
-          assert_equal({ Base.connection_pool.spec => @pool }, @handler.connection_pools)
-        end
+        assert_equal([@pool], @handler.connection_pools)
       end
     end
   end
diff --git a/activerecord/test/cases/connection_adapters/merge_and_resolve_default_url_config_test.rb b/activerecord/test/cases/connection_adapters/merge_and_resolve_default_url_config_test.rb
index 37ad469476..9ee92a3cd2 100644
--- a/activerecord/test/cases/connection_adapters/merge_and_resolve_default_url_config_test.rb
+++ b/activerecord/test/cases/connection_adapters/merge_and_resolve_default_url_config_test.rb
@@ -51,34 +51,6 @@ module ActiveRecord
         assert_equal expected, actual
       end
 
-      def test_resolver_with_database_uri_and_and_current_env_string_key
-        ENV['DATABASE_URL'] = "postgres://localhost/foo"
-        config   = { "default_env" => {  "adapter" => "not_postgres", "database" => "not_foo" } }
-        actual   = assert_deprecated { resolve_spec("default_env", config) }
-        expected = { "adapter"=>"postgresql", "database"=>"foo", "host"=>"localhost" }
-        assert_equal expected, actual
-      end
-
-      def test_resolver_with_database_uri_and_and_current_env_string_key_and_rails_env
-        ENV['DATABASE_URL'] = "postgres://localhost/foo"
-        ENV['RAILS_ENV'] = "foo"
-
-        config   = { "not_production" => {"adapter" => "not_postgres", "database" => "not_foo" } }
-        actual   = assert_deprecated { resolve_spec("foo", config) }
-        expected = { "adapter" => "postgresql", "database" => "foo", "host" => "localhost" }
-        assert_equal expected, actual
-      end
-
-      def test_resolver_with_database_uri_and_and_current_env_string_key_and_rack_env
-        ENV['DATABASE_URL'] = "postgres://localhost/foo"
-        ENV['RACK_ENV'] = "foo"
-
-        config   = { "not_production" => {"adapter" => "not_postgres", "database" => "not_foo" } }
-        actual   = assert_deprecated { resolve_spec("foo", config) }
-        expected = { "adapter" => "postgresql", "database" => "foo", "host" => "localhost" }
-        assert_equal expected, actual
-      end
-
       def test_resolver_with_database_uri_and_known_key
         ENV['DATABASE_URL'] = "postgres://localhost/foo"
         config   = { "production" => { "adapter" => "not_postgres", "database" => "not_foo", "host" => "localhost" } }
@@ -95,16 +67,6 @@ module ActiveRecord
         end
       end
 
-      def test_resolver_with_database_uri_and_unknown_string_key
-        ENV['DATABASE_URL'] = "postgres://localhost/foo"
-        config   = { "not_production" => {  "adapter" => "not_postgres", "database" => "not_foo" } }
-        assert_deprecated do
-          assert_raises AdapterNotSpecified do
-           resolve_spec("production", config)
-          end
-        end
-      end
-
       def test_resolver_with_database_uri_and_supplied_url
         ENV['DATABASE_URL'] = "not-postgres://not-localhost/not_foo"
         config   = { "production" => {  "adapter" => "also_not_postgres", "database" => "also_not_foo" } }
diff --git a/activerecord/test/cases/dirty_test.rb b/activerecord/test/cases/dirty_test.rb
index 98cf60a8c4..5b71bd7e67 100644
--- a/activerecord/test/cases/dirty_test.rb
+++ b/activerecord/test/cases/dirty_test.rb
@@ -165,18 +165,6 @@ class DirtyTest < ActiveRecord::TestCase
     assert_equal parrot.name_change, parrot.title_change
   end
 
-  def test_reset_attribute!
-    pirate = Pirate.create!(:catchphrase => 'Yar!')
-    pirate.catchphrase = 'Ahoy!'
-
-    assert_deprecated do
-      pirate.reset_catchphrase!
-    end
-    assert_equal "Yar!", pirate.catchphrase
-    assert_equal Hash.new, pirate.changes
-    assert !pirate.catchphrase_changed?
-  end
-
   def test_restore_attribute!
     pirate = Pirate.create!(:catchphrase => 'Yar!')
     pirate.catchphrase = 'Ahoy!'
diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index 80ac57ec7c..925491acbd 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -24,9 +24,6 @@ ActiveSupport::Deprecation.debug = true
 # Disable available locale checks to avoid warnings running the test suite.
 I18n.enforce_available_locales = false
 
-# Enable raise errors in after_commit and after_rollback.
-ActiveRecord::Base.raise_in_transactional_callbacks = true
-
 # Connect to the database
 ARTest.connect
 
diff --git a/activerecord/test/cases/migration/change_schema_test.rb b/activerecord/test/cases/migration/change_schema_test.rb
index 337360e97f..b3129a8984 100644
--- a/activerecord/test/cases/migration/change_schema_test.rb
+++ b/activerecord/test/cases/migration/change_schema_test.rb
@@ -195,32 +195,29 @@ module ActiveRecord
       end
 
       def test_create_table_with_timestamps_should_create_datetime_columns
-        # FIXME: Remove the silence when we change the default `null` behavior
-        ActiveSupport::Deprecation.silence do
-          connection.create_table table_name do |t|
-            t.timestamps
-          end
+        connection.create_table table_name do |t|
+          t.timestamps
         end
         created_columns = connection.columns(table_name)
 
         created_at_column = created_columns.detect {|c| c.name == 'created_at' }
         updated_at_column = created_columns.detect {|c| c.name == 'updated_at' }
 
-        assert created_at_column.null
-        assert updated_at_column.null
+        assert !created_at_column.null
+        assert !updated_at_column.null
       end
 
       def test_create_table_with_timestamps_should_create_datetime_columns_with_options
         connection.create_table table_name do |t|
-          t.timestamps :null => false
+          t.timestamps null: true
         end
         created_columns = connection.columns(table_name)
 
         created_at_column = created_columns.detect {|c| c.name == 'created_at' }
         updated_at_column = created_columns.detect {|c| c.name == 'updated_at' }
 
-        assert !created_at_column.null
-        assert !updated_at_column.null
+        assert created_at_column.null
+        assert updated_at_column.null
       end
 
       def test_create_table_without_a_block
diff --git a/activerecord/test/cases/migration/foreign_key_test.rb b/activerecord/test/cases/migration/foreign_key_test.rb
index 51e21528c2..ad35d690bd 100644
--- a/activerecord/test/cases/migration/foreign_key_test.rb
+++ b/activerecord/test/cases/migration/foreign_key_test.rb
@@ -29,7 +29,7 @@ module ActiveRecord
 
       teardown do
         if defined?(@connection)
-          @connection.drop_table "astronauts" if @connection.table_exists? 'astronauts' 
+          @connection.drop_table "astronauts" if @connection.table_exists? 'astronauts'
           @connection.drop_table "rockets" if @connection.table_exists? 'rockets'
         end
       end
@@ -220,6 +220,18 @@ module ActiveRecord
       ensure
         silence_stream($stdout) { migration.migrate(:down) }
       end
+
+      private
+
+      def silence_stream(stream)
+        old_stream = stream.dup
+        stream.reopen(RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ? 'NUL:' : '/dev/null')
+        stream.sync = true
+        yield
+      ensure
+        stream.reopen(old_stream)
+        old_stream.close
+      end
     end
   end
 end
diff --git a/activerecord/test/cases/migration_test.rb b/activerecord/test/cases/migration_test.rb
index 3192b797b4..5829ef2100 100644
--- a/activerecord/test/cases/migration_test.rb
+++ b/activerecord/test/cases/migration_test.rb
@@ -936,4 +936,14 @@ class CopyMigrationsTest < ActiveRecord::TestCase
       end
     end
   end
+
+  def silence_stream(stream)
+    old_stream = stream.dup
+    stream.reopen(RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ? 'NUL:' : '/dev/null')
+    stream.sync = true
+    yield
+  ensure
+    stream.reopen(old_stream)
+    old_stream.close
+  end
 end
diff --git a/activerecord/test/cases/reflection_test.rb b/activerecord/test/cases/reflection_test.rb
index e86b892a0a..a2252a836f 100644
--- a/activerecord/test/cases/reflection_test.rb
+++ b/activerecord/test/cases/reflection_test.rb
@@ -80,10 +80,24 @@ class ReflectionTest < ActiveRecord::TestCase
     assert_equal :integer, @first.column_for_attribute("id").type
   end
 
-  def test_non_existent_columns_return_nil
-    assert_deprecated do
-      assert_nil @first.column_for_attribute("attribute_that_doesnt_exist")
-    end
+  def test_non_existent_columns_return_null_object
+    column = @first.column_for_attribute("attribute_that_doesnt_exist")
+    assert_instance_of ActiveRecord::ConnectionAdapters::NullColumn, column
+    assert_equal "attribute_that_doesnt_exist", column.name
+    assert_equal nil, column.sql_type
+    assert_equal nil, column.type
+    assert_not column.number?
+    assert_not column.text?
+    assert_not column.binary?
+  end
+
+  def test_non_existent_columns_are_identity_types
+    column = @first.column_for_attribute("attribute_that_doesnt_exist")
+    object = Object.new
+
+    assert_equal object, column.type_cast_from_database(object)
+    assert_equal object, column.type_cast_from_user(object)
+    assert_equal object, column.type_cast_for_database(object)
   end
 
   def test_reflection_klass_for_nested_class_name
diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index fb9258c038..2e2c5ee10b 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -1382,12 +1382,6 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal "id", Post.all.primary_key
   end
 
-  def test_disable_implicit_join_references_is_deprecated
-    assert_deprecated do
-      ActiveRecord::Base.disable_implicit_join_references = true
-    end
-  end
-
   def test_ordering_with_extra_spaces
     assert_equal authors(:david), Author.order('id DESC , name DESC').last
   end
diff --git a/activerecord/test/cases/sanitize_test.rb b/activerecord/test/cases/sanitize_test.rb
index f477cf7d92..262e0abc22 100644
--- a/activerecord/test/cases/sanitize_test.rb
+++ b/activerecord/test/cases/sanitize_test.rb
@@ -7,17 +7,6 @@ class SanitizeTest < ActiveRecord::TestCase
   def setup
   end
 
-  def test_sanitize_sql_hash_handles_associations
-    quoted_bambi = ActiveRecord::Base.connection.quote("Bambi")
-    quoted_column_name = ActiveRecord::Base.connection.quote_column_name("name")
-    quoted_table_name = ActiveRecord::Base.connection.quote_table_name("adorable_animals")
-    expected_value = "#{quoted_table_name}.#{quoted_column_name} = #{quoted_bambi}"
-
-    assert_deprecated do
-      assert_equal expected_value, Binary.send(:sanitize_sql_hash, {adorable_animals: {name: 'Bambi'}})
-    end
-  end
-
   def test_sanitize_sql_array_handles_string_interpolation
     quoted_bambi = ActiveRecord::Base.connection.quote_string("Bambi")
     assert_equal "name=#{quoted_bambi}", Binary.send(:sanitize_sql_array, ["name=%s", "Bambi"])
diff --git a/activerecord/test/cases/serialized_attribute_test.rb b/activerecord/test/cases/serialized_attribute_test.rb
index c261a5b1c0..e29f7462c8 100644
--- a/activerecord/test/cases/serialized_attribute_test.rb
+++ b/activerecord/test/cases/serialized_attribute_test.rb
@@ -22,12 +22,6 @@ class SerializedAttributeTest < ActiveRecord::TestCase
     end
   end
 
-  def test_list_of_serialized_attributes
-    assert_deprecated do
-      assert_equal %w(content), Topic.serialized_attributes.keys
-    end
-  end
-
   def test_serialized_attribute
     Topic.serialize("content", MyObject)
 
diff --git a/activerecord/test/cases/transaction_callbacks_test.rb b/activerecord/test/cases/transaction_callbacks_test.rb
index 0f5caa52e3..185fc22e98 100644
--- a/activerecord/test/cases/transaction_callbacks_test.rb
+++ b/activerecord/test/cases/transaction_callbacks_test.rb
@@ -266,47 +266,6 @@ class TransactionCallbacksTest < ActiveRecord::TestCase
     assert_equal 2, @first.rollbacks
   end
 
-  def test_after_transaction_callbacks_should_prevent_callbacks_from_being_called
-    old_transaction_config = ActiveRecord::Base.raise_in_transactional_callbacks
-    ActiveRecord::Base.raise_in_transactional_callbacks = false
-
-    def @first.last_after_transaction_error=(e); @last_transaction_error = e; end
-    def @first.last_after_transaction_error; @last_transaction_error; end
-    @first.after_commit_block{|r| r.last_after_transaction_error = :commit; raise "fail!";}
-    @first.after_rollback_block{|r| r.last_after_transaction_error = :rollback; raise "fail!";}
-
-    second = TopicWithCallbacks.find(3)
-    second.after_commit_block{|r| r.history << :after_commit}
-    second.after_rollback_block{|r| r.history << :after_rollback}
-
-    Topic.transaction do
-      @first.save!
-      second.save!
-    end
-    assert_equal :commit, @first.last_after_transaction_error
-    assert_equal [:after_commit], second.history
-
-    second.history.clear
-    Topic.transaction do
-      @first.save!
-      second.save!
-      raise ActiveRecord::Rollback
-    end
-    assert_equal :rollback, @first.last_after_transaction_error
-    assert_equal [:after_rollback], second.history
-  ensure
-    ActiveRecord::Base.raise_in_transactional_callbacks = old_transaction_config
-  end
-
-  def test_after_commit_should_not_raise_when_raise_in_transactional_callbacks_false
-    old_transaction_config = ActiveRecord::Base.raise_in_transactional_callbacks
-    ActiveRecord::Base.raise_in_transactional_callbacks = false
-    @first.after_commit_block{ fail "boom" }
-    Topic.transaction { @first.save! }
-  ensure
-    ActiveRecord::Base.raise_in_transactional_callbacks = old_transaction_config
-  end
-
   def test_after_commit_callback_should_not_swallow_errors
     @first.after_commit_block{ fail "boom" }
     assert_raises(RuntimeError) do
diff --git a/activerecord/test/cases/types_test.rb b/activerecord/test/cases/types_test.rb
index b0979cbe1f..73e92addfe 100644
--- a/activerecord/test/cases/types_test.rb
+++ b/activerecord/test/cases/types_test.rb
@@ -17,6 +17,10 @@ module ActiveRecord
         assert type.type_cast_from_user('TRUE')
         assert type.type_cast_from_user('on')
         assert type.type_cast_from_user('ON')
+        assert type.type_cast_from_user(' ')
+        assert type.type_cast_from_user("\u3000\r\n")
+        assert type.type_cast_from_user("\u0000")
+        assert type.type_cast_from_user('SOMETHING RANDOM')
 
         # explicitly check for false vs nil
         assert_equal false, type.type_cast_from_user(false)
@@ -28,12 +32,6 @@ module ActiveRecord
         assert_equal false, type.type_cast_from_user('FALSE')
         assert_equal false, type.type_cast_from_user('off')
         assert_equal false, type.type_cast_from_user('OFF')
-        assert_deprecated do
-          assert_equal false, type.type_cast_from_user(' ')
-          assert_equal false, type.type_cast_from_user("\u3000\r\n")
-          assert_equal false, type.type_cast_from_user("\u0000")
-          assert_equal false, type.type_cast_from_user('SOMETHING RANDOM')
-        end
       end
 
       def test_type_cast_float
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index f59ad476ae..aa2090b897 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,36 @@
+*   Change the default test order from `:sorted` to `:random`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `ActiveSupport::JSON::Encoding::CircularReferenceError`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated methods `ActiveSupport::JSON::Encoding.encode_big_decimal_as_string=`
+    and `ActiveSupport::JSON::Encoding.encode_big_decimal_as_string`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `ActiveSupport::SafeBuffer#prepend`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated methods at `Kernel`.
+
+    `silence_stderr`, `silence_stream`, `capture` and `quietly`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `active_support/core_ext/big_decimal/yaml_conversions`
+    file.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated methods `ActiveSupport::Cache::Store.instrument` and
+    `ActiveSupport::Cache::Store.instrument=`.
+
+    *Rafael Mendonça França*
+
 *   Change the way in which callback chains can be halted.
 
     The preferred method to halt a callback chain from now on is to explicitly
@@ -8,7 +41,6 @@
     `Callbacks::CallbackChain.halt_and_display_warning_on_return_false`, will
     either not work at all or display a deprecation warning.
 
-
 *   Add Callbacks::CallbackChain.halt_and_display_warning_on_return_false
 
     Setting `Callbacks::CallbackChain.halt_and_display_warning_on_return_false`
diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb
index dddd1e136e..3a1e1ac3a1 100644
--- a/activesupport/lib/active_support/cache.rb
+++ b/activesupport/lib/active_support/cache.rb
@@ -8,7 +8,6 @@ require 'active_support/core_ext/numeric/bytes'
 require 'active_support/core_ext/numeric/time'
 require 'active_support/core_ext/object/to_param'
 require 'active_support/core_ext/string/inflections'
-require 'active_support/deprecation'
 
 module ActiveSupport
   # See ActiveSupport::Cache::Store for documentation.
@@ -179,18 +178,6 @@ module ActiveSupport
         @silence = previous_silence
       end
 
-      # :deprecated:
-      def self.instrument=(boolean)
-        ActiveSupport::Deprecation.warn "ActiveSupport::Cache.instrument= is deprecated and will be removed in Rails 5. Instrumentation is now always on so you can safely stop using it."
-        true
-      end
-
-      # :deprecated:
-      def self.instrument
-        ActiveSupport::Deprecation.warn "ActiveSupport::Cache.instrument is deprecated and will be removed in Rails 5. Instrumentation is now always on so you can safely stop using it."
-        true
-      end
-
       # Fetches data from the cache, using the given key. If there is data in
       # the cache with the given key, then that data is returned.
       #
diff --git a/activesupport/lib/active_support/core_ext/big_decimal/yaml_conversions.rb b/activesupport/lib/active_support/core_ext/big_decimal/yaml_conversions.rb
deleted file mode 100644
index 46ba93ead4..0000000000
--- a/activesupport/lib/active_support/core_ext/big_decimal/yaml_conversions.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-ActiveSupport::Deprecation.warn 'core_ext/big_decimal/yaml_conversions is deprecated and will be removed in the future.'
-
-require 'bigdecimal'
-require 'yaml'
-require 'active_support/core_ext/big_decimal/conversions'
-
-class BigDecimal
-  YAML_MAPPING = { 'Infinity' => '.Inf', '-Infinity' => '-.Inf', 'NaN' => '.NaN' }
-
-  def encode_with(coder)
-    string = to_s
-    coder.represent_scalar(nil, YAML_MAPPING[string] || string)
-  end
-end
diff --git a/activesupport/lib/active_support/core_ext/kernel/reporting.rb b/activesupport/lib/active_support/core_ext/kernel/reporting.rb
index f5179552bb..eb44646848 100644
--- a/activesupport/lib/active_support/core_ext/kernel/reporting.rb
+++ b/activesupport/lib/active_support/core_ext/kernel/reporting.rb
@@ -29,34 +29,6 @@ module Kernel
     $VERBOSE = old_verbose
   end
 
-  # For compatibility
-  def silence_stderr #:nodoc:
-    ActiveSupport::Deprecation.warn(
-      "`#silence_stderr` is deprecated and will be removed in the next release."
-    ) #not thread-safe
-    silence_stream(STDERR) { yield }
-  end
-
-  # Deprecated : this method is not thread safe
-  # Silences any stream for the duration of the block.
-  #
-  #   silence_stream(STDOUT) do
-  #     puts 'This will never be seen'
-  #   end
-  #
-  #   puts 'But this will'
-  #
-  # This method is not thread-safe.
-  def silence_stream(stream)
-    old_stream = stream.dup
-    stream.reopen(RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ? 'NUL:' : '/dev/null')
-    stream.sync = true
-    yield
-  ensure
-    stream.reopen(old_stream)
-    old_stream.close
-  end
-
   # Blocks and ignores any exception passed as argument if raised within the block.
   #
   #   suppress(ZeroDivisionError) do
@@ -69,56 +41,4 @@ module Kernel
     yield
   rescue *exception_classes
   end
-
-  # Captures the given stream and returns it:
-  #
-  #   stream = capture(:stdout) { puts 'notice' }
-  #   stream # => "notice\n"
-  #
-  #   stream = capture(:stderr) { warn 'error' }
-  #   stream # => "error\n"
-  #
-  # even for subprocesses:
-  #
-  #   stream = capture(:stdout) { system('echo notice') }
-  #   stream # => "notice\n"
-  #
-  #   stream = capture(:stderr) { system('echo error 1>&2') }
-  #   stream # => "error\n"
-  def capture(stream)
-    ActiveSupport::Deprecation.warn(
-      "`#capture(stream)` is deprecated and will be removed in the next release."
-    ) #not thread-safe
-    stream = stream.to_s
-    captured_stream = Tempfile.new(stream)
-    stream_io = eval("$#{stream}")
-    origin_stream = stream_io.dup
-    stream_io.reopen(captured_stream)
-
-    yield
-
-    stream_io.rewind
-    return captured_stream.read
-  ensure
-    captured_stream.close
-    captured_stream.unlink
-    stream_io.reopen(origin_stream)
-  end
-  alias :silence :capture
-
-  # Silences both STDOUT and STDERR, even for subprocesses.
-  #
-  #   quietly { system 'bundle install' }
-  #
-  # This method is not thread-safe.
-  def quietly
-    ActiveSupport::Deprecation.warn(
-      "`#quietly` is deprecated and will be removed in the next release."
-    ) #not thread-safe
-    silence_stream(STDOUT) do
-      silence_stream(STDERR) do
-        yield
-      end
-    end
-  end
 end
diff --git a/activesupport/lib/active_support/core_ext/string/output_safety.rb b/activesupport/lib/active_support/core_ext/string/output_safety.rb
index 231eaedbba..ba8d4acd6d 100644
--- a/activesupport/lib/active_support/core_ext/string/output_safety.rb
+++ b/activesupport/lib/active_support/core_ext/string/output_safety.rb
@@ -1,6 +1,5 @@
 require 'erb'
 require 'active_support/core_ext/kernel/singleton_class'
-require 'active_support/deprecation'
 
 class ERB
   module Util
@@ -190,11 +189,6 @@ module ActiveSupport #:nodoc:
       super(html_escape_interpolated_argument(value))
     end
 
-    def prepend!(value)
-      ActiveSupport::Deprecation.deprecation_warning "ActiveSupport::SafeBuffer#prepend!", :prepend
-      prepend value
-    end
-
     def +(other)
       dup.concat(other)
     end
diff --git a/activesupport/lib/active_support/json/encoding.rb b/activesupport/lib/active_support/json/encoding.rb
index c0ac5af153..48f4967892 100644
--- a/activesupport/lib/active_support/json/encoding.rb
+++ b/activesupport/lib/active_support/json/encoding.rb
@@ -6,7 +6,6 @@ module ActiveSupport
     delegate :use_standard_json_time_format, :use_standard_json_time_format=,
       :time_precision, :time_precision=,
       :escape_html_entities_in_json, :escape_html_entities_in_json=,
-      :encode_big_decimal_as_string, :encode_big_decimal_as_string=,
       :json_encoder, :json_encoder=,
       :to => :'ActiveSupport::JSON::Encoding'
   end
@@ -113,54 +112,6 @@ module ActiveSupport
         # Sets the encoder used by Rails to encode Ruby objects into JSON strings
         # in +Object#to_json+ and +ActiveSupport::JSON.encode+.
         attr_accessor :json_encoder
-
-        def encode_big_decimal_as_string=(as_string)
-          message = \
-            "The JSON encoder in Rails 4.1 no longer supports encoding BigDecimals as JSON numbers. Instead, " \
-            "the new encoder will always encode them as strings.\n\n" \
-            "You are seeing this error because you have 'active_support.encode_big_decimal_as_string' in " \
-            "your configuration file. If you have been setting this to true, you can safely remove it from " \
-            "your configuration. Otherwise, you should add the 'activesupport-json_encoder' gem to your " \
-            "Gemfile in order to restore this functionality."
-
-          raise NotImplementedError, message
-        end
-
-        def encode_big_decimal_as_string
-          message = \
-            "The JSON encoder in Rails 4.1 no longer supports encoding BigDecimals as JSON numbers. Instead, " \
-            "the new encoder will always encode them as strings.\n\n" \
-            "You are seeing this error because you are trying to check the value of the related configuration, " \
-            "`active_support.encode_big_decimal_as_string`. If your application depends on this option, you should " \
-            "add the 'activesupport-json_encoder' gem to your Gemfile. For now, this option will always be true. " \
-            "In the future, it will be removed from Rails, so you should stop checking its value."
-
-          ActiveSupport::Deprecation.warn message
-
-          true
-        end
-
-        # Deprecate CircularReferenceError
-        def const_missing(name)
-          if name == :CircularReferenceError
-            message = "The JSON encoder in Rails 4.1 no longer offers protection from circular references. " \
-                      "You are seeing this warning because you are rescuing from (or otherwise referencing) " \
-                      "ActiveSupport::Encoding::CircularReferenceError. In the future, this error will be " \
-                      "removed from Rails. You should remove these rescue blocks from your code and ensure " \
-                      "that your data structures are free of circular references so they can be properly " \
-                      "serialized into JSON.\n\n" \
-                      "For example, the following Hash contains a circular reference to itself:\n" \
-                      "   h = {}\n" \
-                      "   h['circular'] = h\n" \
-                      "In this case, calling h.to_json would not work properly."
-
-            ActiveSupport::Deprecation.warn message
-
-            SystemStackError
-          else
-            super
-          end
-        end
       end
 
       self.use_standard_json_time_format = true
diff --git a/activesupport/lib/active_support/test_case.rb b/activesupport/lib/active_support/test_case.rb
index 98b68455ab..aa71db3c56 100644
--- a/activesupport/lib/active_support/test_case.rb
+++ b/activesupport/lib/active_support/test_case.rb
@@ -31,29 +31,15 @@ module ActiveSupport
 
       # Returns the order in which test cases are run.
       #
-      #   ActiveSupport::TestCase.test_order # => :sorted
+      #   ActiveSupport::TestCase.test_order # => :random
       #
       # Possible values are +:random+, +:parallel+, +:alpha+, +:sorted+.
-      # Defaults to +:sorted+.
+      # Defaults to +:random+.
       def test_order
         test_order = ActiveSupport.test_order
 
         if test_order.nil?
-          ActiveSupport::Deprecation.warn "You did not specify a value for the " \
-            "configuration option `active_support.test_order`. In Rails 5, " \
-            "the default value of this option will change from `:sorted` to " \
-            "`:random`.\n" \
-            "To disable this warning and keep the current behavior, you can add " \
-            "the following line to your `config/environments/test.rb`:\n" \
-            "\n" \
-            "  Rails.application.configure do\n" \
-            "    config.active_support.test_order = :sorted\n" \
-            "  end\n" \
-            "\n" \
-            "Alternatively, you can opt into the future behavior by setting this " \
-            "option to `:random`."
-
-          test_order = :sorted
+          test_order = :random
           self.test_order = test_order
         end
 
diff --git a/activesupport/test/core_ext/big_decimal/yaml_conversions_test.rb b/activesupport/test/core_ext/big_decimal/yaml_conversions_test.rb
deleted file mode 100644
index e634679d20..0000000000
--- a/activesupport/test/core_ext/big_decimal/yaml_conversions_test.rb
+++ /dev/null
@@ -1,11 +0,0 @@
-require 'abstract_unit'
-
-class BigDecimalYamlConversionsTest < ActiveSupport::TestCase
-  def test_to_yaml
-    assert_deprecated { require 'active_support/core_ext/big_decimal/yaml_conversions' }
-    assert_match("--- 100000.30020320320000000000000000000000000000001\n", BigDecimal.new('100000.30020320320000000000000000000000000000001').to_yaml)
-    assert_match("--- .Inf\n",  BigDecimal.new('Infinity').to_yaml)
-    assert_match("--- .NaN\n",  BigDecimal.new('NaN').to_yaml)
-    assert_match("--- -.Inf\n", BigDecimal.new('-Infinity').to_yaml)
-  end
-end
diff --git a/activesupport/test/core_ext/kernel_test.rb b/activesupport/test/core_ext/kernel_test.rb
index a87af0007c..8abbd6c69b 100644
--- a/activesupport/test/core_ext/kernel_test.rb
+++ b/activesupport/test/core_ext/kernel_test.rb
@@ -15,7 +15,6 @@ class KernelTest < ActiveSupport::TestCase
     assert_equal old_verbose, $VERBOSE
   end
 
-
   def test_enable_warnings
     enable_warnings { assert_equal true, $VERBOSE }
     assert_equal 1234, enable_warnings { 1234 }
@@ -29,57 +28,11 @@ class KernelTest < ActiveSupport::TestCase
     assert_equal old_verbose, $VERBOSE
   end
 
-
-  def test_silence_stream
-    old_stream_position = STDOUT.tell
-    silence_stream(STDOUT) { STDOUT.puts 'hello world' }
-    assert_equal old_stream_position, STDOUT.tell
-  rescue Errno::ESPIPE
-    # Skip if we can't stream.tell
-  end
-
-  def test_silence_stream_closes_file_descriptors
-    stream     = StringIO.new
-    dup_stream = StringIO.new
-    stream.stubs(:dup).returns(dup_stream)
-    dup_stream.expects(:close)
-    silence_stream(stream) { stream.puts 'hello world' }
-  end
-
-  def test_quietly
-    old_stdout_position, old_stderr_position = STDOUT.tell, STDERR.tell
-    assert_deprecated do
-      quietly do
-        puts 'see me, feel me'
-        STDERR.puts 'touch me, heal me'
-      end
-    end
-    assert_equal old_stdout_position, STDOUT.tell
-    assert_equal old_stderr_position, STDERR.tell
-  rescue Errno::ESPIPE
-    # Skip if we can't STDERR.tell
-  end
-
   def test_class_eval
     o = Object.new
     class << o; @x = 1; end
     assert_equal 1, o.class_eval { @x }
   end
-
-  def test_capture
-    assert_deprecated do
-      assert_equal 'STDERR', capture(:stderr) { $stderr.print 'STDERR' }
-    end
-    assert_deprecated do
-      assert_equal 'STDOUT', capture(:stdout) { print 'STDOUT' }
-    end
-    assert_deprecated do
-      assert_equal "STDERR\n", capture(:stderr) { system('echo STDERR 1>&2') }
-    end
-    assert_deprecated do
-      assert_equal "STDOUT\n", capture(:stdout) { system('echo STDOUT') }
-    end
-  end
 end
 
 class KernelSuppressTest < ActiveSupport::TestCase
diff --git a/activesupport/test/core_ext/string_ext_test.rb b/activesupport/test/core_ext/string_ext_test.rb
index 0af207fae9..cdc695f036 100644
--- a/activesupport/test/core_ext/string_ext_test.rb
+++ b/activesupport/test/core_ext/string_ext_test.rb
@@ -667,16 +667,6 @@ class OutputSafetyTest < ActiveSupport::TestCase
     assert_equal other, "&lt;foo&gt;other"
   end
 
-  test "Deprecated #prepend! method is still present" do
-    other = "other".html_safe
-
-    assert_deprecated do
-      other.prepend! "<foo>"
-    end
-
-    assert_equal other, "&lt;foo&gt;other"
-  end
-
   test "Concatting safe onto unsafe yields unsafe" do
     @other_string = "other"
 
diff --git a/activesupport/test/json/encoding_test.rb b/activesupport/test/json/encoding_test.rb
index 7e976aa772..5c5045da1e 100644
--- a/activesupport/test/json/encoding_test.rb
+++ b/activesupport/test/json/encoding_test.rb
@@ -176,46 +176,6 @@ class TestJSONEncoding < ActiveSupport::TestCase
     assert_equal "𐒑", decoded_hash['string']
   end
 
-  def test_reading_encode_big_decimal_as_string_option
-    assert_deprecated do
-      assert ActiveSupport.encode_big_decimal_as_string
-    end
-  end
-
-  def test_setting_deprecated_encode_big_decimal_as_string_option
-    assert_raise(NotImplementedError) do
-      ActiveSupport.encode_big_decimal_as_string = true
-    end
-
-    assert_raise(NotImplementedError) do
-      ActiveSupport.encode_big_decimal_as_string = false
-    end
-  end
-
-  def test_exception_raised_when_encoding_circular_reference_in_array
-    a = [1]
-    a << a
-    assert_deprecated do
-      assert_raise(ActiveSupport::JSON::Encoding::CircularReferenceError) { ActiveSupport::JSON.encode(a) }
-    end
-  end
-
-  def test_exception_raised_when_encoding_circular_reference_in_hash
-    a = { :name => 'foo' }
-    a[:next] = a
-    assert_deprecated do
-      assert_raise(ActiveSupport::JSON::Encoding::CircularReferenceError) { ActiveSupport::JSON.encode(a) }
-    end
-  end
-
-  def test_exception_raised_when_encoding_circular_reference_in_hash_inside_array
-    a = { :name => 'foo', :sub => [] }
-    a[:sub] << a
-    assert_deprecated do
-      assert_raise(ActiveSupport::JSON::Encoding::CircularReferenceError) { ActiveSupport::JSON.encode(a) }
-    end
-  end
-
   def test_hash_key_identifiers_are_always_quoted
     values = {0 => 0, 1 => 1, :_ => :_, "$" => "$", "a" => "a", :A => :A, :A0 => :A0, "A0B" => "A0B"}
     assert_equal %w( "$" "A" "A0" "A0B" "_" "a" "0" "1" ).sort, object_keys(ActiveSupport::JSON.encode(values))
diff --git a/activesupport/test/test_case_test.rb b/activesupport/test/test_case_test.rb
index 5e852c8050..151b623171 100644
--- a/activesupport/test/test_case_test.rb
+++ b/activesupport/test/test_case_test.rb
@@ -182,30 +182,28 @@ class TestOrderTest < ActiveSupport::TestCase
     ActiveSupport::TestCase.test_order = @original_test_order
   end
 
-  def test_defaults_to_sorted_with_warning
+  def test_defaults_to_random
     ActiveSupport::TestCase.test_order = nil
 
-    assert_equal :sorted, assert_deprecated { ActiveSupport::TestCase.test_order }
+    assert_equal :random, ActiveSupport::TestCase.test_order
 
-    # It should only produce a deprecation warning the first time this is accessed
-    assert_equal :sorted, assert_not_deprecated { ActiveSupport::TestCase.test_order }
-    assert_equal :sorted, assert_not_deprecated { ActiveSupport.test_order }
+    assert_equal :random, ActiveSupport.test_order
   end
 
   def test_test_order_is_global
-    ActiveSupport::TestCase.test_order = :random
-
-    assert_equal :random, ActiveSupport.test_order
-    assert_equal :random, ActiveSupport::TestCase.test_order
-    assert_equal :random, self.class.test_order
-    assert_equal :random, Class.new(ActiveSupport::TestCase).test_order
-
-    ActiveSupport.test_order = :sorted
+    ActiveSupport::TestCase.test_order = :sorted
 
     assert_equal :sorted, ActiveSupport.test_order
     assert_equal :sorted, ActiveSupport::TestCase.test_order
     assert_equal :sorted, self.class.test_order
     assert_equal :sorted, Class.new(ActiveSupport::TestCase).test_order
+
+    ActiveSupport.test_order = :random
+
+    assert_equal :random, ActiveSupport.test_order
+    assert_equal :random, ActiveSupport::TestCase.test_order
+    assert_equal :random, self.class.test_order
+    assert_equal :random, Class.new(ActiveSupport::TestCase).test_order
   end
 
   def test_i_suck_and_my_tests_are_order_dependent!
diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index f67c87d74d..f565b7bd55 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -1,3 +1,17 @@
+*   Remove deprecated `test:all` and `test:all:db` tasks.
+
+*   Remove deprecated `Rails::Rack::LogTailer`.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `RAILS_CACHE` constant.
+
+    *Rafael Mendonça França*
+
+*   Remove deprecated `serve_static_assets` configuration.
+
+    *Rafael Mendonça França*
+
 *   Use local variables in `_form.html.erb` partial generated by scaffold.
 
     *Andrew Kozlov*
diff --git a/railties/lib/rails/application/bootstrap.rb b/railties/lib/rails/application/bootstrap.rb
index 71d3febde4..0f4d932749 100644
--- a/railties/lib/rails/application/bootstrap.rb
+++ b/railties/lib/rails/application/bootstrap.rb
@@ -1,6 +1,5 @@
 require "active_support/notifications"
 require "active_support/dependencies"
-require "active_support/deprecation"
 require "active_support/descendants_tracker"
 
 module Rails
@@ -55,18 +54,6 @@ INFO
           logger
         end
 
-        if Rails.env.production? && !config.has_explicit_log_level?
-          ActiveSupport::Deprecation.warn \
-           "You did not specify a `log_level` in `production.rb`. Currently, " \
-           "the default value for `log_level` is `:info` for the production " \
-           "environment and `:debug` in all other environments. In Rails 5 " \
-           "the default value will be unified to `:debug` across all " \
-           "environments. To preserve the current setting, add the following " \
-           "line to your `production.rb`:\n" \
-           "\n" \
-           "   config.log_level = :info\n\n"
-        end
-
         Rails.logger.level = ActiveSupport::Logger.const_get(config.log_level.to_s.upcase)
       end
 
diff --git a/railties/lib/rails/application/configuration.rb b/railties/lib/rails/application/configuration.rb
index fdc741dd08..2821c8d757 100644
--- a/railties/lib/rails/application/configuration.rb
+++ b/railties/lib/rails/application/configuration.rb
@@ -1,7 +1,5 @@
 require 'active_support/core_ext/kernel/reporting'
-require 'active_support/core_ext/string/filters'
 require 'active_support/file_update_checker'
-require 'active_support/deprecation'
 require 'rails/engine/configuration'
 require 'rails/source_annotation_extractor'
 
@@ -17,6 +15,7 @@ module Rails
                     :time_zone, :reload_classes_only_on_change,
                     :beginning_of_week, :filter_redirect, :x
 
+      attr_writer :log_level
       attr_reader :encoding
 
       def initialize(*)
@@ -35,7 +34,6 @@ module Rails
         @session_options               = {}
         @time_zone                     = "UTC"
         @beginning_of_week             = :monday
-        @has_explicit_log_level        = false
         @log_level                     = nil
         @middleware                    = app_middleware
         @generators                    = app_generators
@@ -119,15 +117,6 @@ module Rails
         raise e, "Cannot load `Rails.application.database_configuration`:\n#{e.message}", e.backtrace
       end
 
-      def has_explicit_log_level? # :nodoc:
-        @has_explicit_log_level
-      end
-
-      def log_level=(level)
-        @has_explicit_log_level = !!(level)
-        @log_level = level
-      end
-
       def log_level
         @log_level ||= (Rails.env.production? ? :info : :debug)
       end
@@ -141,25 +130,6 @@ module Rails
         self.generators.colorize_logging = val
       end
 
-      # :nodoc:
-      SERVE_STATIC_ASSETS_DEPRECATION_MESSAGE = <<-MSG.squish
-        The configuration option `config.serve_static_assets` has been renamed
-        to `config.serve_static_files` to clarify its role (it merely enables
-        serving everything in the `public` folder and is unrelated to the asset
-        pipeline). The `serve_static_assets` alias will be removed in Rails 5.0.
-        Please migrate your configuration files accordingly.
-      MSG
-
-      def serve_static_assets
-        ActiveSupport::Deprecation.warn SERVE_STATIC_ASSETS_DEPRECATION_MESSAGE
-        serve_static_files
-      end
-
-      def serve_static_assets=(value)
-        ActiveSupport::Deprecation.warn SERVE_STATIC_ASSETS_DEPRECATION_MESSAGE
-        self.serve_static_files = value
-      end
-
       def session_store(*args)
         if args.empty?
           case @session_store
diff --git a/railties/lib/rails/deprecation.rb b/railties/lib/rails/deprecation.rb
deleted file mode 100644
index 89f54069e9..0000000000
--- a/railties/lib/rails/deprecation.rb
+++ /dev/null
@@ -1,19 +0,0 @@
-require 'active_support/deprecation/proxy_wrappers'
-
-module Rails
-  class DeprecatedConstant < ActiveSupport::Deprecation::DeprecatedConstantProxy
-    def self.deprecate(old, current)
-      # double assignment is used to avoid "assigned but unused variable" warning
-      constant = constant = new(old, current)
-      eval "::#{old} = constant"
-    end
-
-    private
-
-    def target
-      ::Kernel.eval @new_const.to_s
-    end
-  end
-
-  DeprecatedConstant.deprecate('RAILS_CACHE', '::Rails.cache')
-end
diff --git a/railties/lib/rails/generators/rails/app/templates/config/application.rb b/railties/lib/rails/generators/rails/app/templates/config/application.rb
index dc0cc07888..c59ffb3491 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/application.rb
+++ b/railties/lib/rails/generators/rails/app/templates/config/application.rb
@@ -31,10 +31,5 @@ module <%= app_const_base %>
     # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
     # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
     # config.i18n.default_locale = :de
-    <%- unless options.skip_active_record? -%>
-
-    # Do not swallow errors in after_commit/after_rollback callbacks.
-    config.active_record.raise_in_transactional_callbacks = true
-    <%- end -%>
   end
 end
diff --git a/railties/lib/rails/rack.rb b/railties/lib/rails/rack.rb
index 886f0e52e1..f34bf2fd41 100644
--- a/railties/lib/rails/rack.rb
+++ b/railties/lib/rails/rack.rb
@@ -2,6 +2,5 @@ module Rails
   module Rack
     autoload :Debugger,      "rails/rack/debugger"   if RUBY_VERSION < '2.0.0'
     autoload :Logger,        "rails/rack/logger"
-    autoload :LogTailer,     "rails/rack/log_tailer"
   end
 end
diff --git a/railties/lib/rails/rack/log_tailer.rb b/railties/lib/rails/rack/log_tailer.rb
deleted file mode 100644
index 46517713c9..0000000000
--- a/railties/lib/rails/rack/log_tailer.rb
+++ /dev/null
@@ -1,38 +0,0 @@
-require 'active_support/deprecation'
-
-module Rails
-  module Rack
-    class LogTailer
-      def initialize(app, log = nil)
-        ActiveSupport::Deprecation.warn('LogTailer is deprecated and will be removed on Rails 5.')
-
-        @app = app
-
-        path = Pathname.new(log || "#{::File.expand_path(Rails.root)}/log/#{Rails.env}.log").cleanpath
-
-        @cursor = @file = nil
-        if ::File.exist?(path)
-          @cursor = ::File.size(path)
-          @file = ::File.open(path, 'r')
-        end
-      end
-
-      def call(env)
-        response = @app.call(env)
-        tail!
-        response
-      end
-
-      def tail!
-        return unless @cursor
-        @file.seek @cursor
-
-        unless @file.eof?
-          contents = @file.read
-          @cursor = @file.tell
-          $stdout.print contents
-        end
-      end
-    end
-  end
-end
diff --git a/railties/lib/rails/test_unit/testing.rake b/railties/lib/rails/test_unit/testing.rake
index 254ea9ecf6..d836c0d6d6 100644
--- a/railties/lib/rails/test_unit/testing.rake
+++ b/railties/lib/rails/test_unit/testing.rake
@@ -21,29 +21,6 @@ namespace :test do
   desc "Run tests quickly, but also reset db"
   task :db => %w[db:test:prepare test]
 
-  desc "Run tests quickly by merging all types and not resetting db"
-  Rails::TestTask.new(:all) do |t|
-    t.pattern = "test/**/*_test.rb"
-  end
-
-  Rake::Task["test:all"].enhance do
-    Rake::Task["test:deprecate_all"].invoke
-  end
-
-  task :deprecate_all do
-    ActiveSupport::Deprecation.warn "rake test:all is deprecated and will be removed in Rails 5. " \
-    "Use rake test to run all tests in test directory."
-  end
-
-  namespace :all do
-    desc "Run tests quickly, but also reset db"
-    task :db => %w[db:test:prepare test:all]
-
-    Rake::Task["test:all:db"].enhance do
-      Rake::Task["test:deprecate_all"].invoke
-    end
-  end
-
   Rails::TestTask.new(single: "test:prepare")
 
   ["models", "helpers", "controllers", "mailers", "integration", "jobs"].each do |name|
diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index ad15e30b6a..8f5b2d0d68 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -320,22 +320,6 @@ module ApplicationTests
       end
     end
 
-    test "config.serve_static_assets is deprecated" do
-      require "#{app_path}/config/application"
-
-      assert_deprecated(/serve_static_assets/) do
-        app.config.serve_static_assets = false
-      end
-
-      assert_not app.config.serve_static_files
-      assert_deprecated(/serve_static_assets/) { assert_not app.config.serve_static_assets }
-
-      app.config.serve_static_files = true
-
-      assert app.config.serve_static_files
-      assert_deprecated(/serve_static_assets/) { assert app.config.serve_static_assets }
-    end
-
     test "Use key_generator when secret_key_base is set" do
       make_basic_app do |application|
         application.secrets.secret_key_base = 'b3c631c314c0bbca50c1b2843150fe33'
@@ -1062,36 +1046,6 @@ module ApplicationTests
       end
     end
 
-    test "Blank config.log_level is not deprecated for non-production environment" do
-      with_rails_env "development" do
-        assert_not_deprecated do
-          make_basic_app do |application|
-            application.config.log_level = nil
-          end
-        end
-      end
-    end
-
-    test "Blank config.log_level is deprecated for the production environment" do
-      with_rails_env "production" do
-        assert_deprecated(/log_level/) do
-          make_basic_app do |application|
-            application.config.log_level = nil
-          end
-        end
-      end
-    end
-
-    test "Not blank config.log_level is not deprecated for the production environment" do
-      with_rails_env "production" do
-        assert_not_deprecated do
-          make_basic_app do |application|
-            application.config.log_level = :info
-          end
-        end
-      end
-    end
-
     test "config.log_level with custom logger" do
       make_basic_app do |application|
         application.config.logger = Logger.new(STDOUT)
diff --git a/railties/test/application/initializers/frameworks_test.rb b/railties/test/application/initializers/frameworks_test.rb
index 2d45c9b53f..97b51911d9 100644
--- a/railties/test/application/initializers/frameworks_test.rb
+++ b/railties/test/application/initializers/frameworks_test.rb
@@ -65,7 +65,6 @@ module ApplicationTests
       RUBY
 
       require "#{app_path}/config/environment"
-      assert Foo.method_defined?(:foo_path)
       assert Foo.method_defined?(:foo_url)
       assert Foo.method_defined?(:main_app)
     end
diff --git a/railties/test/application/mailer_previews_test.rb b/railties/test/application/mailer_previews_test.rb
index 9e4f858539..1752a9f3c6 100644
--- a/railties/test/application/mailer_previews_test.rb
+++ b/railties/test/application/mailer_previews_test.rb
@@ -428,58 +428,6 @@ module ApplicationTests
       assert_match '<option selected value="?part=text%2Fplain">View as plain-text email</option>', last_response.body
     end
 
-    test "*_path helpers emit a deprecation" do
-
-      app_file "config/routes.rb", <<-RUBY
-        Rails.application.routes.draw do
-          get 'foo', to: 'foo#index'
-        end
-      RUBY
-
-      mailer 'notifier', <<-RUBY
-        class Notifier < ActionMailer::Base
-          default from: "from@example.com"
-
-          def path_in_view
-            mail to: "to@example.org"
-          end
-
-          def path_in_mailer
-            @url = foo_path
-            mail to: "to@example.org"
-          end
-        end
-      RUBY
-
-      html_template 'notifier/path_in_view', "<%= link_to 'foo', foo_path %>"
-
-      mailer_preview 'notifier', <<-RUBY
-        class NotifierPreview < ActionMailer::Preview
-          def path_in_view
-            Notifier.path_in_view
-          end
-
-          def path_in_mailer
-            Notifier.path_in_mailer
-          end
-        end
-      RUBY
-
-      app('development')
-
-      assert_deprecated do
-        get "/rails/mailers/notifier/path_in_view.html"
-        assert_equal 200, last_response.status
-      end
-
-      html_template 'notifier/path_in_mailer', "No ERB in here"
-
-      assert_deprecated do
-        get "/rails/mailers/notifier/path_in_mailer.html"
-        assert_equal 200, last_response.status
-      end
-    end
-
     private
       def build_app
         super
diff --git a/railties/test/generators/generators_test_helper.rb b/railties/test/generators/generators_test_helper.rb
index 6cc91f166b..94099fcd2e 100644
--- a/railties/test/generators/generators_test_helper.rb
+++ b/railties/test/generators/generators_test_helper.rb
@@ -49,4 +49,14 @@ module GeneratorsTestHelper
       end
     end
   end
+
+  def silence_stream(stream)
+    old_stream = stream.dup
+    stream.reopen(RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ? 'NUL:' : '/dev/null')
+    stream.sync = true
+    yield
+  ensure
+    stream.reopen(old_stream)
+    old_stream.close
+  end
 end
diff --git a/railties/test/generators/model_generator_test.rb b/railties/test/generators/model_generator_test.rb
index afee0a655d..f3b699101f 100644
--- a/railties/test/generators/model_generator_test.rb
+++ b/railties/test/generators/model_generator_test.rb
@@ -223,7 +223,7 @@ class ModelGeneratorTest < Rails::Generators::TestCase
 
   def test_migration_with_timestamps
     run_generator
-    assert_migration "db/migrate/create_accounts.rb", /t.timestamps null: false/
+    assert_migration "db/migrate/create_accounts.rb", /t.timestamps/
   end
 
   def test_migration_timestamps_are_skipped
diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index 9ad0ec0d34..39e8a5f756 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -338,6 +338,16 @@ class ActiveSupport::TestCase
       end
     end
   end
+
+  def silence_stream(stream)
+    old_stream = stream.dup
+    stream.reopen(RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ? 'NUL:' : '/dev/null')
+    stream.sync = true
+    yield
+  ensure
+    stream.reopen(old_stream)
+    old_stream.close
+  end
 end
 
 # Create a scope and build a fixture rails app
diff --git a/railties/test/railties/engine_test.rb b/railties/test/railties/engine_test.rb
index 4ffcf64275..6185742cc1 100644
--- a/railties/test/railties/engine_test.rb
+++ b/railties/test/railties/engine_test.rb
@@ -741,8 +741,8 @@ YAML
       assert_equal "bukkits_", Bukkits.table_name_prefix
       assert_equal "bukkits", Bukkits::Engine.engine_name
       assert_equal Bukkits.railtie_namespace, Bukkits::Engine
-      assert ::Bukkits::MyMailer.method_defined?(:foo_path)
-      assert !::Bukkits::MyMailer.method_defined?(:bar_path)
+      assert ::Bukkits::MyMailer.method_defined?(:foo_url)
+      assert !::Bukkits::MyMailer.method_defined?(:bar_url)
 
       get("/bukkits/from_app")
       assert_equal "false", last_response.body