Merge branch 'master' into merge-action-cable

54 files changed, 485 insertions, 407 deletions

diff --git a/Gemfile b/Gemfile
index 4745f428f2..2f9e1eb897 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,14 +20,18 @@ gem 'turbolinks', github: 'rails/turbolinks', branch: 'master'
 gem 'arel', github: 'rails/arel', branch: 'master'
 gem 'mail', github: 'mikel/mail', branch: 'master'
 
-gem 'sprockets', '~> 4.0', github: 'rails/sprockets', branch: 'master'
 gem 'sprockets-rails', '~> 3.0.0.beta3', github: 'rails/sprockets-rails', branch: 'master'
-gem 'sass-rails', github: 'rails/sass-rails', branch: 'master'
 
 # require: false so bcrypt is loaded only when has_secure_password is used.
 # This is to avoid Active Model (and by extension the entire framework)
 # being dependent on a binary library.
-gem 'bcrypt', '~> 3.1.10', require: false
+platforms :mingw, :x64_mingw, :mswin, :mswin64 do
+  gem 'bcrypt-ruby', '~> 3.0.0', require: false
+end
+
+platforms :ruby, :jruby, :rbx do
+  gem 'bcrypt', '~> 3.1.10', require: false
+end
 
 # This needs to be with require false to avoid it being automatically loaded by
 # sprockets.
@@ -85,7 +89,7 @@ group :test do
   gem 'benchmark-ips'
 end
 
-platforms :ruby do
+platforms :ruby, :mswin, :mswin64, :mingw, :x64_mingw do
   gem 'nokogiri', '>= 1.6.7'
 
   # Needed for compiling the ActionDispatch::Journey parser.
diff --git a/Gemfile.lock b/Gemfile.lock
index 233d4d04cb..dd137dae94 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,7 +21,7 @@ GIT
 
 GIT
   remote: git://github.com/mikel/mail.git
-  revision: 9c313a401729b9aa9177878836829a61adf67b54
+  revision: f0efbd4850d1bc06cdcba6178c282eeaba9c8c43
   branch: master
   specs:
     mail (2.6.3.edge)
@@ -29,7 +29,7 @@ GIT
 
 GIT
   remote: git://github.com/rack/rack.git
-  revision: 35599cfc2751e0ee611c0ff799924b8e7fe0c0b4
+  revision: 96ae9b9fed8d6809383b6f48a5884437e76f8ca4
   branch: master
   specs:
     rack (2.0.0.alpha)
@@ -37,14 +37,14 @@ GIT
 
 GIT
   remote: git://github.com/rails/arel.git
-  revision: 3c429c5d86e9e2201c2a35d934ca6a8911c18e69
+  revision: 899e8428c50c586e6c8d4884b542ac9fdf01e95f
   branch: master
   specs:
     arel (7.0.0.alpha)
 
 GIT
   remote: git://github.com/rails/globalid.git
-  revision: 1d8fca667740570d204fd955a0bd39ac539bac7f
+  revision: 4e74ec6bb60d735ef3c56080f9c9f1dee9cadaaf
   branch: master
   specs:
     globalid (0.3.6)
@@ -61,19 +61,8 @@ GIT
       thor (>= 0.14, < 2.0)
 
 GIT
-  remote: git://github.com/rails/sass-rails.git
-  revision: 6e4eee736bcbfa5b2962467673c7a51abf434c67
-  branch: master
-  specs:
-    sass-rails (6.0.0)
-      railties (>= 4.0.0, < 5.0)
-      sass (~> 3.4)
-      sprockets (>= 4.0)
-      sprockets-rails (< 4.0)
-
-GIT
   remote: git://github.com/rails/sprockets-rails.git
-  revision: 93a45b1c463a063ec7cf4d160107b67aa3db7a1a
+  revision: 06d84e952490d7d391592124f6e3b79f9c596674
   branch: master
   specs:
     sprockets-rails (3.0.0.beta3)
@@ -82,16 +71,8 @@ GIT
       sprockets (>= 3.0.0)
 
 GIT
-  remote: git://github.com/rails/sprockets.git
-  revision: 5a77f8b007b8ec61edd783c48baf9d971f1c684d
-  branch: master
-  specs:
-    sprockets (4.0.0)
-      rack (>= 1, < 3)
-
-GIT
   remote: git://github.com/rails/turbolinks.git
-  revision: 83d4b3d2c52a681f07900c28adb28bc8da604733
+  revision: ad583843fdaa0c1f61462a346a495981ca314460
   branch: master
   specs:
     turbolinks (3.0.0)
@@ -99,10 +80,10 @@ GIT
 
 GIT
   remote: git://github.com/sass/sass.git
-  revision: 4e3e1d5684cc29073a507578fc977434ff488c93
+  revision: bce9509f396225d721501ea1070a6871b708abb1
   branch: stable
   specs:
-    sass (3.4.19)
+    sass (3.4.20)
 
 PATH
   remote: .
@@ -174,18 +155,18 @@ GEM
   remote: https://rubygems.org/
   specs:
     amq-protocol (2.0.0)
-    backburner (1.1.0)
+    backburner (1.2.0)
       beaneater (~> 1.0)
       dante (> 0.1.5)
     bcrypt (3.1.10)
-    bcrypt (3.1.10-x64-mingw32)
-    bcrypt (3.1.10-x86-mingw32)
+    bcrypt-ruby (3.0.1)
+    bcrypt-ruby (3.0.1-x86-mingw32)
     beaneater (1.0.0)
     benchmark-ips (2.3.0)
     builder (3.2.2)
-    bunny (2.2.0)
+    bunny (2.2.1)
       amq-protocol (>= 2.0.0)
-    byebug (8.2.0)
+    byebug (8.2.1)
     celluloid (0.17.2)
       celluloid-essentials
       celluloid-extras
@@ -209,10 +190,10 @@ GEM
     coffee-script (2.4.1)
       coffee-script-source
       execjs
-    coffee-script-source (1.9.1.1)
+    coffee-script-source (1.10.0)
     concurrent-ruby (1.0.0)
     connection_pool (2.2.0)
-    dalli (2.7.4)
+    dalli (2.7.5)
     dante (0.2.0)
     delayed_job (4.1.1)
       activesupport (>= 3.0, < 5.0)
@@ -246,7 +227,7 @@ GEM
       nokogiri (>= 1.5.9)
     metaclass (0.0.4)
     method_source (0.8.2)
-    mime-types (2.6.2)
+    mime-types (2.99)
     mini_portile2 (2.0.0)
     minitest (5.3.3)
     mocha (0.14.0)
@@ -255,19 +236,24 @@ GEM
     multi_json (1.11.2)
     mustache (1.0.2)
     mysql (2.9.1)
-    mysql2 (0.4.1)
+    mysql (2.9.1-x86-mingw32)
+    mysql2 (0.4.2)
+    mysql2 (0.4.2-x64-mingw32)
+    mysql2 (0.4.2-x86-mingw32)
     nokogiri (1.6.7)
       mini_portile2 (~> 2.0.0.rc2)
     nokogiri (1.6.7-x64-mingw32)
       mini_portile2 (~> 2.0.0.rc2)
     nokogiri (1.6.7-x86-mingw32)
       mini_portile2 (~> 2.0.0.rc2)
-    pg (0.18.3)
-    psych (2.0.15)
+    pg (0.18.4)
+    pg (0.18.4-x64-mingw32)
+    pg (0.18.4-x86-mingw32)
+    psych (2.0.16)
     puma (2.15.3)
     que (0.11.2)
-    racc (1.4.13)
-    rack-cache (1.5.0)
+    racc (1.4.14)
+    rack-cache (1.5.1)
       rack (>= 0.4)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -285,7 +271,7 @@ GEM
       ffi (>= 0.5.0)
     rdoc (4.2.0)
     redcarpet (3.2.3)
-    redis (3.2.1)
+    redis (3.2.2)
     redis-namespace (1.5.2)
       redis (~> 3.0, >= 3.0.4)
     resque (1.25.2)
@@ -299,19 +285,18 @@ GEM
       redis (~> 3.0)
       resque (~> 1.25)
       rufus-scheduler (~> 3.0)
-    rufus-scheduler (3.1.7)
+    rufus-scheduler (3.1.10)
     sdoc (0.4.1)
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)
-    sequel (4.27.0)
+    sequel (4.29.0)
     serverengine (1.5.11)
       sigdump (~> 0.2.2)
-    sidekiq (3.5.1)
-      celluloid (~> 0.17.2)
+    sidekiq (4.0.1)
+      concurrent-ruby (~> 1.0)
       connection_pool (~> 2.2, >= 2.2.0)
       json (~> 1.0)
       redis (~> 3.2, >= 3.2.1)
-      redis-namespace (~> 1.5, >= 1.5.2)
     sigdump (0.2.3)
     sinatra (1.0)
       rack (>= 1.0)
@@ -320,7 +305,12 @@ GEM
       serverengine (~> 1.5.11)
       thor
       thread (~> 0.1.7)
+    sprockets (3.5.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
     sqlite3 (1.3.11)
+    sqlite3 (1.3.11-x64-mingw32)
+    sqlite3 (1.3.11-x86-mingw32)
     stackprof (0.2.7)
     sucker_punch (1.6.0)
       celluloid (~> 0.17.2)
@@ -357,6 +347,7 @@ DEPENDENCIES
   arel!
   backburner
   bcrypt (~> 3.1.10)
+  bcrypt-ruby (~> 3.0.0)
   benchmark-ips
   byebug
   coffee-rails (~> 4.1.0)
@@ -390,12 +381,10 @@ DEPENDENCIES
   resque
   resque-scheduler
   sass!
-  sass-rails!
   sdoc (~> 0.4.0)
   sequel
   sidekiq
   sneakers
-  sprockets (~> 4.0)!
   sprockets-rails (~> 3.0.0.beta3)!
   sqlite3 (~> 1.3.6)
   stackprof
diff --git a/actionpack/lib/abstract_controller/callbacks.rb b/actionpack/lib/abstract_controller/callbacks.rb
index d5317e4717..d63ce9c1c3 100644
--- a/actionpack/lib/abstract_controller/callbacks.rb
+++ b/actionpack/lib/abstract_controller/callbacks.rb
@@ -48,7 +48,8 @@ module AbstractController
 
       def _normalize_callback_option(options, from, to) # :nodoc:
         if from = options[from]
-          from = Array(from).map {|o| "action_name == '#{o}'"}.join(" || ")
+          _from = Array(from).map(&:to_s).to_set
+          from = proc {|c| _from.include? c.action_name }
           options[to] = Array(options[to]).unshift(from)
         end
       end
diff --git a/actionpack/lib/action_controller/caching/fragments.rb b/actionpack/lib/action_controller/caching/fragments.rb
index c42384b741..b9ad51a9cf 100644
--- a/actionpack/lib/action_controller/caching/fragments.rb
+++ b/actionpack/lib/action_controller/caching/fragments.rb
@@ -62,7 +62,7 @@ module ActionController
       # with the specified +key+ value. The key is expanded using
       # ActiveSupport::Cache.expand_cache_key.
       def fragment_cache_key(key)
-        head = self.class.fragment_cache_keys.map { |key| instance_exec(&key) }
+        head = self.class.fragment_cache_keys.map { |k| instance_exec(&k) }
         tail = key.is_a?(Hash) ? url_for(key).split("://").last : key
         ActiveSupport::Cache.expand_cache_key([*head, *tail], :views)
       end
diff --git a/actionpack/lib/action_controller/metal/http_authentication.rb b/actionpack/lib/action_controller/metal/http_authentication.rb
index 0a36fecd27..2ac6e37e34 100644
--- a/actionpack/lib/action_controller/metal/http_authentication.rb
+++ b/actionpack/lib/action_controller/metal/http_authentication.rb
@@ -397,7 +397,7 @@ module ActionController
     #   RewriteRule ^(.*)$ dispatch.fcgi [E=X-HTTP_AUTHORIZATION:%{HTTP:Authorization},QSA,L]
     module Token
       TOKEN_KEY = 'token='
-      TOKEN_REGEX = /^(Token|Bearer) /
+      TOKEN_REGEX = /^(Token|Bearer)\s+/
       AUTHN_PAIR_DELIMITERS = /(?:,|;|\t+)/
       extend self
 
diff --git a/actionpack/test/controller/helper_test.rb b/actionpack/test/controller/helper_test.rb
index 3ecfedefd1..feb882a2b3 100644
--- a/actionpack/test/controller/helper_test.rb
+++ b/actionpack/test/controller/helper_test.rb
@@ -141,20 +141,10 @@ class HelperTest < ActiveSupport::TestCase
   def test_helper_for_nested_controller
     assert_equal 'hello: Iz guuut!',
       call_controller(Fun::GamesController, "render_hello_world").last.body
-    # request  = ActionController::TestRequest.new
-    #
-    # resp = Fun::GamesController.action(:render_hello_world).call(request.env)
-    # assert_equal 'hello: Iz guuut!', resp.last.body
   end
 
   def test_helper_for_acronym_controller
     assert_equal "test: baz", call_controller(Fun::PdfController, "test").last.body
-    #
-    # request  = ActionController::TestRequest.new
-    # response = ActionDispatch::TestResponse.new
-    # request.action = 'test'
-    #
-    # assert_equal 'test: baz', Fun::PdfController.process(request, response).body
   end
 
   def test_default_helpers_only
diff --git a/actionpack/test/controller/http_token_authentication_test.rb b/actionpack/test/controller/http_token_authentication_test.rb
index 9c5a01c318..98e3c891a7 100644
--- a/actionpack/test/controller/http_token_authentication_test.rb
+++ b/actionpack/test/controller/http_token_authentication_test.rb
@@ -94,6 +94,14 @@ class HttpTokenAuthenticationTest < ActionController::TestCase
     assert_response :success
   end
 
+  test "authentication request with tab in header" do
+    @request.env['HTTP_AUTHORIZATION'] = "Token\ttoken=\"lifo\""
+    get :index
+
+    assert_response :success
+    assert_equal 'Hello Secret', @response.body
+  end
+
   test "authentication request without credential" do
     get :display
 
diff --git a/actionview/test/template/date_helper_test.rb b/actionview/test/template/date_helper_test.rb
index c4234a71c3..92e77599f4 100644
--- a/actionview/test/template/date_helper_test.rb
+++ b/actionview/test/template/date_helper_test.rb
@@ -390,11 +390,6 @@ class DateHelperTest < ActionView::TestCase
     expected << "</select>\n"
 
     assert_dom_equal expected, select_month(Time.mktime(2003, 8, 16), {}, :class => 'selector', :accesskey => 'M')
-    #result = select_month(Time.mktime(2003, 8, 16), {}, :class => 'selector', :accesskey => 'M')
-    #assert result.include?('<select id="date_month" name="date[month]"')
-    #assert result.include?('class="selector"')
-    #assert result.include?('accesskey="M"')
-    #assert result.include?('<option value="1">January')
   end
 
   def test_select_month_with_default_prompt
@@ -474,11 +469,6 @@ class DateHelperTest < ActionView::TestCase
     expected << "</select>\n"
 
     assert_dom_equal expected, select_year(Time.mktime(2003, 8, 16), {:start_year => 2003, :end_year => 2005}, :class => 'selector', :accesskey => 'M')
-    #result = select_year(Time.mktime(2003, 8, 16), {:start_year => 2003, :end_year => 2005}, :class => 'selector', :accesskey => 'M')
-    #assert result.include?('<select id="date_year" name="date[year]"')
-    #assert result.include?('class="selector"')
-    #assert result.include?('accesskey="M"')
-    #assert result.include?('<option value="2003"')
   end
 
   def test_select_year_with_default_prompt
@@ -639,12 +629,6 @@ class DateHelperTest < ActionView::TestCase
     expected << "</select>\n"
 
     assert_dom_equal expected, select_minute(Time.mktime(2003, 8, 16, 8, 4, 18), {}, :class => 'selector', :accesskey => 'M')
-
-    #result = select_minute(Time.mktime(2003, 8, 16, 8, 4, 18), {}, :class => 'selector', :accesskey => 'M')
-    #assert result.include?('<select id="date_minute" name="date[minute]"')
-    #assert result.include?('class="selector"')
-    #assert result.include?('accesskey="M"')
-    #assert result.include?('<option value="00">00')
   end
 
   def test_select_minute_with_default_prompt
@@ -709,12 +693,6 @@ class DateHelperTest < ActionView::TestCase
     expected << "</select>\n"
 
     assert_dom_equal expected, select_second(Time.mktime(2003, 8, 16, 8, 4, 18), {}, :class => 'selector', :accesskey => 'M')
-
-    #result = select_second(Time.mktime(2003, 8, 16, 8, 4, 18), {}, :class => 'selector', :accesskey => 'M')
-    #assert result.include?('<select id="date_second" name="date[second]"')
-    #assert result.include?('class="selector"')
-    #assert result.include?('accesskey="M"')
-    #assert result.include?('<option value="00">00')
   end
 
   def test_select_second_with_default_prompt
diff --git a/activemodel/test/cases/callbacks_test.rb b/activemodel/test/cases/callbacks_test.rb
index 85455c112c..e4ecc0adb4 100644
--- a/activemodel/test/cases/callbacks_test.rb
+++ b/activemodel/test/cases/callbacks_test.rb
@@ -28,7 +28,7 @@ class CallbacksTest < ActiveModel::TestCase
       false
     end
 
-    after_create "@callbacks << :final_callback"
+    ActiveSupport::Deprecation.silence { after_create "@callbacks << :final_callback" }
 
     def initialize(options = {})
       @callbacks = []
diff --git a/activemodel/test/cases/validations/with_validation_test.rb b/activemodel/test/cases/validations/with_validation_test.rb
index 03c7943308..c73580138d 100644
--- a/activemodel/test/cases/validations/with_validation_test.rb
+++ b/activemodel/test/cases/validations/with_validation_test.rb
@@ -101,6 +101,7 @@ class ValidatesWithTest < ActiveModel::TestCase
     validator.expect(:new, validator, [{foo: :bar, if: "1 == 1", class: Topic}])
     validator.expect(:validate, nil, [topic])
     validator.expect(:is_a?, false, [Symbol])
+    validator.expect(:is_a?, false, [String])
 
     Topic.validates_with(validator, if: "1 == 1", foo: :bar)
     assert topic.valid?
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 87420a0746..f1921dded8 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,18 @@
+*   Introduce ApplicationRecord, an Active Record layer super type.
+
+    An `ApplicationRecord` let's engines have models, isolated from the main
+    application. Plugin authors can use it to distribute extensions as modules
+    to be included into `ApplicationRecord`, instead of monkey patches. It can
+    also serve as a place for applications to customize the default
+    `ActiveRecord::Base` model behaviour.
+
+    Newly generated applications have `app/models/application_record.rb`
+    present by default. Generators are smart enough to recognize that
+    newly generated models have to inherit from `ApplicationRecord` only if
+    it's present.
+
+    *Genadi Samokovarov*
+
 *   Version the API presented to migration classes, so we can change parameter
     defaults without breaking existing migrations, or forcing them to be
     rewritten through a deprecation cycle.
diff --git a/activerecord/lib/active_record/callbacks.rb b/activerecord/lib/active_record/callbacks.rb
index 4058affec3..854f9776a3 100644
--- a/activerecord/lib/active_record/callbacks.rb
+++ b/activerecord/lib/active_record/callbacks.rb
@@ -175,21 +175,6 @@ module ActiveRecord
   #       end
   #   end
   #
-  # The callback macros usually accept a symbol for the method they're supposed to run, but you can also
-  # pass a "method string", which will then be evaluated within the binding of the callback. Example:
-  #
-  #   class Topic < ActiveRecord::Base
-  #     before_destroy 'self.class.delete_all "parent_id = #{id}"'
-  #   end
-  #
-  # Notice that single quotes (') are used so the <tt>#{id}</tt> part isn't evaluated until the callback
-  # is triggered. Also note that these inline callbacks can be stacked just like the regular ones:
-  #
-  #   class Topic < ActiveRecord::Base
-  #     before_destroy 'self.class.delete_all "parent_id = #{id}"',
-  #                    'puts "Evaluated after parents are destroyed"'
-  #   end
-  #
   # == <tt>before_validation*</tt> returning statements
   #
   # If the +before_validation+ callback throws +:abort+, the process will be
diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index 7ca597859d..6590e0140d 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -10,9 +10,9 @@ module ActiveRecord
       config = config.symbolize_keys
 
       config[:username] = 'root' if config[:username].nil?
-
+      config[:flags] ||= 0
       if Mysql2::Client.const_defined? :FOUND_ROWS
-        config[:flags] = Mysql2::Client::FOUND_ROWS
+        config[:flags] |= Mysql2::Client::FOUND_ROWS
       end
 
       client = Mysql2::Client.new(config)
diff --git a/activerecord/lib/rails/generators/active_record/model/model_generator.rb b/activerecord/lib/rails/generators/active_record/model/model_generator.rb
index 395951ac9d..e4c9539362 100644
--- a/activerecord/lib/rails/generators/active_record/model/model_generator.rb
+++ b/activerecord/lib/rails/generators/active_record/model/model_generator.rb
@@ -43,9 +43,16 @@ module ActiveRecord
 
         # Used by the migration template to determine the parent name of the model
         def parent_class_name
-          options[:parent] || "ActiveRecord::Base"
+          options[:parent] || determine_default_parent_class
         end
 
+        def determine_default_parent_class
+          if File.exist?('app/models/application_record.rb')
+            "ApplicationRecord"
+          else
+            "ActiveRecord::Base"
+          end
+        end
     end
   end
 end
diff --git a/activerecord/test/cases/adapters/mysql2/connection_test.rb b/activerecord/test/cases/adapters/mysql2/connection_test.rb
index 507d024bb6..8fabcfb5c0 100644
--- a/activerecord/test/cases/adapters/mysql2/connection_test.rb
+++ b/activerecord/test/cases/adapters/mysql2/connection_test.rb
@@ -83,6 +83,13 @@ class Mysql2ConnectionTest < ActiveRecord::Mysql2TestCase
       assert_equal [['']], result.rows
     end
   end
+  
+  def test_passing_arbitary_flags_to_adapter
+    run_without_connection do |orig_connection|             
+      ActiveRecord::Base.establish_connection(orig_connection.merge({flags: Mysql2::Client::COMPRESS}))
+      assert_equal (Mysql2::Client::COMPRESS |  Mysql2::Client::FOUND_ROWS), ActiveRecord::Base.connection.raw_connection.query_options[:flags]
+    end
+  end
 
   def test_mysql_strict_mode_specified_default
     run_without_connection do |orig_connection|
diff --git a/activerecord/test/cases/callbacks_test.rb b/activerecord/test/cases/callbacks_test.rb
index 73ac30e547..4f70ae3a1d 100644
--- a/activerecord/test/cases/callbacks_test.rb
+++ b/activerecord/test/cases/callbacks_test.rb
@@ -33,7 +33,7 @@ class CallbackDeveloper < ActiveRecord::Base
   ActiveRecord::Callbacks::CALLBACKS.each do |callback_method|
     next if callback_method.to_s =~ /^around_/
     define_callback_method(callback_method)
-    send(callback_method, callback_string(callback_method))
+    ActiveSupport::Deprecation.silence { send(callback_method, callback_string(callback_method)) }
     send(callback_method, callback_proc(callback_method))
     send(callback_method, callback_object(callback_method))
     send(callback_method) { |model| model.history << [callback_method, :block] }
diff --git a/activerecord/test/cases/fixtures_test.rb b/activerecord/test/cases/fixtures_test.rb
index f30ed4fcc8..c73958900b 100644
--- a/activerecord/test/cases/fixtures_test.rb
+++ b/activerecord/test/cases/fixtures_test.rb
@@ -184,7 +184,6 @@ class FixturesTest < ActiveRecord::TestCase
   end
 
   def test_fixtures_from_root_yml_with_instantiation
-    # assert_equal 2, @accounts.size
     assert_equal 50, @unknown.credit_limit
   end
 
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 88558cde1c..07f7fae5d5 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,10 +1,19 @@
+*   Deprecated `Module#qualified_const_` in favour of the builtin Module#const_
+    methods.
+
+    *Genadi Samokovarov*
+
+*   Deprecate passing string to define callback.
+
+    *Yuichiro Kaneko*
+
 *   `ActiveSupport::Cache::Store#namespaced_key`, 
     `ActiveSupport::Cache::MemCachedStore#escape_key`, and 
     `ActiveSupport::Cache::FileStore#key_file_path` 
     are deprecated and replaced with `normalize_key` that now calls `super`.
-    
+
     `ActiveSupport::Cache::LocaleCache#set_cache_value` is deprecated and replaced with `write_cache_value`.
-    
+
     *Michael Grosser*
 
 *   Implements an evented file watcher to asynchronously detect changes in the
diff --git a/activesupport/bin/generate_tables b/activesupport/bin/generate_tables
index 71a6b78652..2193533588 100755
--- a/activesupport/bin/generate_tables
+++ b/activesupport/bin/generate_tables
@@ -50,16 +50,11 @@ module ActiveSupport
             ([0-9A-F]*);        # simple lowercase mapping
             ([0-9A-F]*)$/ix     # simple titlecase mapping
           codepoint.code              = $1.hex
-          #codepoint.name              = $2
-          #codepoint.category          = $3
           codepoint.combining_class   = Integer($4)
-          #codepoint.bidi_class        = $5
           codepoint.decomp_type       = $7
           codepoint.decomp_mapping    = ($8=='') ? nil : $8.split.collect(&:hex)
-          #codepoint.bidi_mirrored     = ($13=='Y') ? true : false
           codepoint.uppercase_mapping = ($16=='') ? 0 : $16.hex
           codepoint.lowercase_mapping = ($17=='') ? 0 : $17.hex
-          #codepoint.titlecase_mapping = ($18=='') ? nil : $18.hex
           @ucd.codepoints[codepoint.code] = codepoint
         end
 
diff --git a/activesupport/lib/active_support/callbacks.rb b/activesupport/lib/active_support/callbacks.rb
index d43fde03a9..bf560ec1fa 100644
--- a/activesupport/lib/active_support/callbacks.rb
+++ b/activesupport/lib/active_support/callbacks.rb
@@ -295,6 +295,13 @@ module ActiveSupport
 
     class Callback #:nodoc:#
       def self.build(chain, filter, kind, options)
+        if filter.is_a?(String)
+          ActiveSupport::Deprecation.warn(<<-MSG.squish)
+            Passing string to define callback is deprecated and will be removed
+            in Rails 5.1 without replacement.
+          MSG
+        end
+
         new chain.name, filter, kind, options, chain.config
       end
 
@@ -575,7 +582,7 @@ module ActiveSupport
       #   set_callback :save, :before_meth
       #
       # The callback can be specified as a symbol naming an instance method; as a
-      # proc, lambda, or block; as a string to be instance evaluated; or as an
+      # proc, lambda, or block; as a string to be instance evaluated(deprecated); or as an
       # object that responds to a certain method determined by the <tt>:scope</tt>
       # argument to +define_callbacks+.
       #
diff --git a/activesupport/lib/active_support/core_ext/module/qualified_const.rb b/activesupport/lib/active_support/core_ext/module/qualified_const.rb
index 65525013db..3ea39d4267 100644
--- a/activesupport/lib/active_support/core_ext/module/qualified_const.rb
+++ b/activesupport/lib/active_support/core_ext/module/qualified_const.rb
@@ -3,13 +3,16 @@ require 'active_support/core_ext/string/inflections'
 #--
 # Allows code reuse in the methods below without polluting Module.
 #++
-module QualifiedConstUtils
-  def self.raise_if_absolute(path)
-    raise NameError.new("wrong constant name #$&") if path =~ /\A::[^:]+/
-  end
 
-  def self.names(path)
-    path.split('::')
+module ActiveSupport
+  module QualifiedConstUtils
+    def self.raise_if_absolute(path)
+      raise NameError.new("wrong constant name #$&") if path =~ /\A::[^:]+/
+    end
+
+    def self.names(path)
+      path.split('::')
+    end
   end
 end
 
@@ -24,9 +27,14 @@ end
 #++
 class Module
   def qualified_const_defined?(path, search_parents=true)
-    QualifiedConstUtils.raise_if_absolute(path)
+    ActiveSupport::Deprecation.warn(<<-MESSAGE.squish)
+      Module#qualified_const_defined? is deprecated in favour of the builtin
+      Module#const_defined? and will be removed in Rails 5.1.
+    MESSAGE
 
-    QualifiedConstUtils.names(path).inject(self) do |mod, name|
+    ActiveSupport::QualifiedConstUtils.raise_if_absolute(path)
+
+    ActiveSupport::QualifiedConstUtils.names(path).inject(self) do |mod, name|
       return unless mod.const_defined?(name, search_parents)
       mod.const_get(name)
     end
@@ -34,19 +42,29 @@ class Module
   end
 
   def qualified_const_get(path)
-    QualifiedConstUtils.raise_if_absolute(path)
+    ActiveSupport::Deprecation.warn(<<-MESSAGE.squish)
+      Module#qualified_const_get is deprecated in favour of the builtin
+      Module#const_get and will be removed in Rails 5.1.
+    MESSAGE
+
+    ActiveSupport::QualifiedConstUtils.raise_if_absolute(path)
 
-    QualifiedConstUtils.names(path).inject(self) do |mod, name|
+    ActiveSupport::QualifiedConstUtils.names(path).inject(self) do |mod, name|
       mod.const_get(name)
     end
   end
 
   def qualified_const_set(path, value)
-    QualifiedConstUtils.raise_if_absolute(path)
+    ActiveSupport::Deprecation.warn(<<-MESSAGE.squish)
+      Module#qualified_const_set is deprecated in favour of the builtin
+      Module#const_set and will be removed in Rails 5.1.
+    MESSAGE
+
+    ActiveSupport::QualifiedConstUtils.raise_if_absolute(path)
 
     const_name = path.demodulize
     mod_name = path.deconstantize
-    mod = mod_name.empty? ? self : qualified_const_get(mod_name)
+    mod = mod_name.empty? ? self : const_get(mod_name)
     mod.const_set(const_name, value)
   end
 end
diff --git a/activesupport/lib/active_support/core_ext/range/conversions.rb b/activesupport/lib/active_support/core_ext/range/conversions.rb
index 83eced50bf..965436c23a 100644
--- a/activesupport/lib/active_support/core_ext/range/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/range/conversions.rb
@@ -1,34 +1,31 @@
-class Range
+module ActiveSupport::RangeWithFormat
   RANGE_FORMATS = {
     :db => Proc.new { |start, stop| "BETWEEN '#{start.to_s(:db)}' AND '#{stop.to_s(:db)}'" }
   }
 
   # Convert range to a formatted string. See RANGE_FORMATS for predefined formats.
   #
-  # This method is aliased to <tt>to_s</tt>.
-  #
   #   range = (1..100)           # => 1..100
   #
-  #   range.to_formatted_s       # => "1..100"
   #   range.to_s                 # => "1..100"
-  #
-  #   range.to_formatted_s(:db)  # => "BETWEEN '1' AND '100'"
   #   range.to_s(:db)            # => "BETWEEN '1' AND '100'"
   #
-  # == Adding your own range formats to to_formatted_s
+  # == Adding your own range formats to to_s
   # You can add your own formats to the Range::RANGE_FORMATS hash.
   # Use the format name as the hash key and a Proc instance.
   #
   #   # config/initializers/range_formats.rb
   #   Range::RANGE_FORMATS[:short] = ->(start, stop) { "Between #{start.to_s(:db)} and #{stop.to_s(:db)}" }
-  def to_formatted_s(format = :default)
+  def to_s(format = :default)
     if formatter = RANGE_FORMATS[format]
       formatter.call(first, last)
     else
-      to_default_s
+      super()
     end
   end
 
   alias_method :to_default_s, :to_s
-  alias_method :to_s, :to_formatted_s
+  alias_method :to_formatted_s, :to_s
 end
+
+Range.prepend(ActiveSupport::RangeWithFormat)
diff --git a/activesupport/lib/active_support/core_ext/time/calculations.rb b/activesupport/lib/active_support/core_ext/time/calculations.rb
index 675db8a36b..768c9a1b2c 100644
--- a/activesupport/lib/active_support/core_ext/time/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/time/calculations.rb
@@ -162,7 +162,6 @@ class Time
 
   # Returns a new Time representing the start of the day (0:00)
   def beginning_of_day
-    #(self - seconds_since_midnight).change(usec: 0)
     change(:hour => 0)
   end
   alias :midnight :beginning_of_day
diff --git a/activesupport/test/callbacks_test.rb b/activesupport/test/callbacks_test.rb
index 3b00ff87a0..a624473f46 100644
--- a/activesupport/test/callbacks_test.rb
+++ b/activesupport/test/callbacks_test.rb
@@ -59,7 +59,7 @@ module CallbacksTest
     [:before_save, :after_save].each do |callback_method|
       callback_method_sym = callback_method.to_sym
       send(callback_method, callback_symbol(callback_method_sym))
-      send(callback_method, callback_string(callback_method_sym))
+      ActiveSupport::Deprecation.silence { send(callback_method, callback_string(callback_method_sym)) }
       send(callback_method, callback_proc(callback_method_sym))
       send(callback_method, callback_object(callback_method_sym.to_s.gsub(/_save/, '')))
       send(callback_method, CallbackClass)
@@ -228,7 +228,7 @@ module CallbacksTest
     set_callback :save, :before, :nope,           :if =>     :no
     set_callback :save, :before, :nope,           :unless => :yes
     set_callback :save, :after,  :tweedle
-    set_callback :save, :before, "tweedle_dee"
+    ActiveSupport::Deprecation.silence { set_callback :save, :before, "tweedle_dee" }
     set_callback :save, :before, proc {|m| m.history << "yup" }
     set_callback :save, :before, :nope,           :if =>     proc { false }
     set_callback :save, :before, :nope,           :unless => proc { true }
@@ -1046,7 +1046,7 @@ module CallbacksTest
 
     def test_add_eval
       calls = []
-      klass = build_class("bar")
+      klass = ActiveSupport::Deprecation.silence { build_class("bar") }
       klass.class_eval { define_method(:bar) { calls << klass } }
       klass.new.run
       assert_equal 1, calls.length
@@ -1086,7 +1086,7 @@ module CallbacksTest
 
     def test_skip_string # raises error
       calls = []
-      klass = build_class("bar")
+      klass =  ActiveSupport::Deprecation.silence { build_class("bar") }
       klass.class_eval { define_method(:bar) { calls << klass } }
       assert_raises(ArgumentError) { klass.skip "bar" }
       klass.new.run
@@ -1111,4 +1111,14 @@ module CallbacksTest
       assert_equal 1, calls.length
     end
   end
+
+  class DeprecatedWarningTest < ActiveSupport::TestCase
+    def test_deprecate_string_callback
+      klass = Class.new(Record)
+
+      assert_deprecated do
+        klass.send :before_save, "tweedle_dee"
+      end
+    end
+  end
 end
diff --git a/activesupport/test/core_ext/module/qualified_const_test.rb b/activesupport/test/core_ext/module/qualified_const_test.rb
index 37c9228a64..a3146cabe1 100644
--- a/activesupport/test/core_ext/module/qualified_const_test.rb
+++ b/activesupport/test/core_ext/module/qualified_const_test.rb
@@ -19,84 +19,94 @@ end
 
 class QualifiedConstTest < ActiveSupport::TestCase
   test "Object.qualified_const_defined?" do
-    assert Object.qualified_const_defined?("QualifiedConstTestMod")
-    assert !Object.qualified_const_defined?("NonExistingQualifiedConstTestMod")
-
-    assert Object.qualified_const_defined?("QualifiedConstTestMod::X")
-    assert !Object.qualified_const_defined?("QualifiedConstTestMod::Y")
-
-    assert Object.qualified_const_defined?("QualifiedConstTestMod::M::X")
-    assert !Object.qualified_const_defined?("QualifiedConstTestMod::M::Y")
-
-    if Module.method(:const_defined?).arity == 1
-      assert !Object.qualified_const_defined?("QualifiedConstTestMod::N::X")
-    else
-      assert Object.qualified_const_defined?("QualifiedConstTestMod::N::X")
-      assert !Object.qualified_const_defined?("QualifiedConstTestMod::N::X", false)
-      assert Object.qualified_const_defined?("QualifiedConstTestMod::N::X", true)
+    assert_deprecated do
+      assert Object.qualified_const_defined?("QualifiedConstTestMod")
+      assert !Object.qualified_const_defined?("NonExistingQualifiedConstTestMod")
+
+      assert Object.qualified_const_defined?("QualifiedConstTestMod::X")
+      assert !Object.qualified_const_defined?("QualifiedConstTestMod::Y")
+
+      assert Object.qualified_const_defined?("QualifiedConstTestMod::M::X")
+      assert !Object.qualified_const_defined?("QualifiedConstTestMod::M::Y")
+
+      if Module.method(:const_defined?).arity == 1
+        assert !Object.qualified_const_defined?("QualifiedConstTestMod::N::X")
+      else
+        assert Object.qualified_const_defined?("QualifiedConstTestMod::N::X")
+        assert !Object.qualified_const_defined?("QualifiedConstTestMod::N::X", false)
+        assert Object.qualified_const_defined?("QualifiedConstTestMod::N::X", true)
+      end
     end
   end
 
   test "mod.qualified_const_defined?" do
-    assert QualifiedConstTestMod.qualified_const_defined?("M")
-    assert !QualifiedConstTestMod.qualified_const_defined?("NonExistingM")
-
-    assert QualifiedConstTestMod.qualified_const_defined?("M::X")
-    assert !QualifiedConstTestMod.qualified_const_defined?("M::Y")
-
-    assert QualifiedConstTestMod.qualified_const_defined?("M::C::X")
-    assert !QualifiedConstTestMod.qualified_const_defined?("M::C::Y")
-
-    if Module.method(:const_defined?).arity == 1
-      assert !QualifiedConstTestMod.qualified_const_defined?("QualifiedConstTestMod::N::X")
-    else
-      assert QualifiedConstTestMod.qualified_const_defined?("N::X")
-      assert !QualifiedConstTestMod.qualified_const_defined?("N::X", false)
-      assert QualifiedConstTestMod.qualified_const_defined?("N::X", true)
+    assert_deprecated do
+      assert QualifiedConstTestMod.qualified_const_defined?("M")
+      assert !QualifiedConstTestMod.qualified_const_defined?("NonExistingM")
+
+      assert QualifiedConstTestMod.qualified_const_defined?("M::X")
+      assert !QualifiedConstTestMod.qualified_const_defined?("M::Y")
+
+      assert QualifiedConstTestMod.qualified_const_defined?("M::C::X")
+      assert !QualifiedConstTestMod.qualified_const_defined?("M::C::Y")
+
+      if Module.method(:const_defined?).arity == 1
+        assert !QualifiedConstTestMod.qualified_const_defined?("QualifiedConstTestMod::N::X")
+      else
+        assert QualifiedConstTestMod.qualified_const_defined?("N::X")
+        assert !QualifiedConstTestMod.qualified_const_defined?("N::X", false)
+        assert QualifiedConstTestMod.qualified_const_defined?("N::X", true)
+      end
     end
   end
 
   test "qualified_const_get" do
-    assert_equal false, Object.qualified_const_get("QualifiedConstTestMod::X")
-    assert_equal false, QualifiedConstTestMod.qualified_const_get("X")
-    assert_equal 1, QualifiedConstTestMod.qualified_const_get("M::X")
-    assert_equal 1, QualifiedConstTestMod.qualified_const_get("N::X")
-    assert_equal 2, QualifiedConstTestMod.qualified_const_get("M::C::X")
-
-    assert_raise(NameError) { QualifiedConstTestMod.qualified_const_get("M::C::Y")}
+    assert_deprecated do
+      assert_equal false, Object.qualified_const_get("QualifiedConstTestMod::X")
+      assert_equal false, QualifiedConstTestMod.qualified_const_get("X")
+      assert_equal 1, QualifiedConstTestMod.qualified_const_get("M::X")
+      assert_equal 1, QualifiedConstTestMod.qualified_const_get("N::X")
+      assert_equal 2, QualifiedConstTestMod.qualified_const_get("M::C::X")
+
+      assert_raise(NameError) { QualifiedConstTestMod.qualified_const_get("M::C::Y")}
+    end
   end
 
   test "qualified_const_set" do
-    begin
-      m = Module.new
-      assert_equal m, Object.qualified_const_set("QualifiedConstTestMod2", m)
-      assert_equal m, ::QualifiedConstTestMod2
-
-      # We are going to assign to existing constants on purpose, so silence warnings.
-      silence_warnings do
-        assert_equal true, QualifiedConstTestMod.qualified_const_set("QualifiedConstTestMod::X", true)
-        assert_equal true, QualifiedConstTestMod::X
-
-        assert_equal 10, QualifiedConstTestMod::M.qualified_const_set("X", 10)
-        assert_equal 10, QualifiedConstTestMod::M::X
-      end
-    ensure
-      silence_warnings do
-        QualifiedConstTestMod.qualified_const_set('QualifiedConstTestMod::X', false)
-        QualifiedConstTestMod::M.qualified_const_set('X', 1)
+    assert_deprecated do
+      begin
+        m = Module.new
+        assert_equal m, Object.qualified_const_set("QualifiedConstTestMod2", m)
+        assert_equal m, ::QualifiedConstTestMod2
+
+        # We are going to assign to existing constants on purpose, so silence warnings.
+        silence_warnings do
+          assert_equal true, QualifiedConstTestMod.qualified_const_set("QualifiedConstTestMod::X", true)
+          assert_equal true, QualifiedConstTestMod::X
+
+          assert_equal 10, QualifiedConstTestMod::M.qualified_const_set("X", 10)
+          assert_equal 10, QualifiedConstTestMod::M::X
+        end
+      ensure
+        silence_warnings do
+          QualifiedConstTestMod.qualified_const_set('QualifiedConstTestMod::X', false)
+          QualifiedConstTestMod::M.qualified_const_set('X', 1)
+        end
       end
     end
   end
 
   test "reject absolute paths" do
-    assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_defined?("::X")}
-    assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_defined?("::X::Y")}
+    assert_deprecated do
+      assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_defined?("::X")}
+      assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_defined?("::X::Y")}
 
-    assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_get("::X")}
-    assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_get("::X::Y")}
+      assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_get("::X")}
+      assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_get("::X::Y")}
 
-    assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_set("::X", nil)}
-    assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_set("::X::Y", nil)}
+      assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_set("::X", nil)}
+      assert_raise_with_message(NameError, "wrong constant name ::X") { Object.qualified_const_set("::X::Y", nil)}
+    end
   end
 
   private
diff --git a/guides/source/active_record_basics.md b/guides/source/active_record_basics.md
index abb22f9cb8..8bd135ddd5 100644
--- a/guides/source/active_record_basics.md
+++ b/guides/source/active_record_basics.md
@@ -132,10 +132,10 @@ Creating Active Record Models
 -----------------------------
 
 It is very easy to create Active Record models. All you have to do is to
-subclass the `ActiveRecord::Base` class and you're good to go:
+subclass the `ApplicationRecord` class and you're good to go:
 
 ```ruby
-class Product < ActiveRecord::Base
+class Product < ApplicationRecord
 end
 ```
 
@@ -168,11 +168,12 @@ What if you need to follow a different naming convention or need to use your
 Rails application with a legacy database? No problem, you can easily override
 the default conventions.
 
-You can use the `ActiveRecord::Base.table_name=` method to specify the table
-name that should be used:
+`ApplicationRecord` inherits from `ActionController::Base`, which defines a
+number of helpful methods. You can use the `ActiveRecord::Base.table_name=`
+method to specify the table name that should be used:
 
 ```ruby
-class Product < ActiveRecord::Base
+class Product < ApplicationRecord
   self.table_name = "my_products"
 end
 ```
@@ -193,7 +194,7 @@ It's also possible to override the column that should be used as the table's
 primary key using the `ActiveRecord::Base.primary_key=` method:
 
 ```ruby
-class Product < ActiveRecord::Base
+class Product < ApplicationRecord
   self.primary_key = "product_id"
 end
 ```
@@ -320,7 +321,7 @@ they raise the exception `ActiveRecord::RecordInvalid` if validation fails.
 A quick example to illustrate:
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   validates :name, presence: true
 end
 
diff --git a/guides/source/active_record_callbacks.md b/guides/source/active_record_callbacks.md
index b5ad3e9411..d95c6c0e78 100644
--- a/guides/source/active_record_callbacks.md
+++ b/guides/source/active_record_callbacks.md
@@ -31,7 +31,7 @@ Callbacks are methods that get called at certain moments of an object's life cyc
 In order to use the available callbacks, you need to register them. You can implement the callbacks as ordinary methods and use a macro-style class method to register them as callbacks:
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   validates :login, :email, presence: true
 
   before_validation :ensure_login_has_a_value
@@ -48,7 +48,7 @@ end
 The macro-style class methods can also receive a block. Consider using this style if the code inside your block is so short that it fits in a single line:
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   validates :login, :email, presence: true
 
   before_create do
@@ -60,7 +60,7 @@ end
 Callbacks can also be registered to only fire on certain life cycle events:
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   before_validation :normalize_name, on: :create
 
   # :on takes an array as well
@@ -126,7 +126,7 @@ The `after_find` callback will be called whenever Active Record loads a record f
 The `after_initialize` and `after_find` callbacks have no `before_*` counterparts, but they can be registered just like the other Active Record callbacks.
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   after_initialize do |user|
     puts "You have initialized an object!"
   end
@@ -151,7 +151,7 @@ You have initialized an object!
 The `after_touch` callback will be called whenever an Active Record object is touched.
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   after_touch do |user|
     puts "You have touched an object"
   end
@@ -168,14 +168,14 @@ You have touched an object
 It can be used along with `belongs_to`:
 
 ```ruby
-class Employee < ActiveRecord::Base
+class Employee < ApplicationRecord
   belongs_to :company, touch: true
   after_touch do
     puts 'An Employee was touched'
   end
 end
 
-class Company < ActiveRecord::Base
+class Company < ApplicationRecord
   has_many :employees
   after_touch :log_when_employees_or_company_touched
 
@@ -266,11 +266,11 @@ Relational Callbacks
 Callbacks work through model relationships, and can even be defined by them. Suppose an example where a user has many articles. A user's articles should be destroyed if the user is destroyed. Let's add an `after_destroy` callback to the `User` model by way of its relationship to the `Article` model:
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   has_many :articles, dependent: :destroy
 end
 
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   after_destroy :log_destroy_action
 
   def log_destroy_action
@@ -297,7 +297,7 @@ As with validations, we can also make the calling of a callback method condition
 You can associate the `:if` and `:unless` options with a symbol corresponding to the name of a predicate method that will get called right before the callback. When using the `:if` option, the callback won't be executed if the predicate method returns false; when using the `:unless` option, the callback won't be executed if the predicate method returns true. This is the most common option. Using this form of registration it is also possible to register several different predicates that should be called to check if the callback should be executed.
 
 ```ruby
-class Order < ActiveRecord::Base
+class Order < ApplicationRecord
   before_save :normalize_card_number, if: :paid_with_card?
 end
 ```
@@ -307,7 +307,7 @@ end
 You can also use a string that will be evaluated using `eval` and hence needs to contain valid Ruby code. You should use this option only when the string represents a really short condition:
 
 ```ruby
-class Order < ActiveRecord::Base
+class Order < ApplicationRecord
   before_save :normalize_card_number, if: "paid_with_card?"
 end
 ```
@@ -317,7 +317,7 @@ end
 Finally, it is possible to associate `:if` and `:unless` with a `Proc` object. This option is best suited when writing short validation methods, usually one-liners:
 
 ```ruby
-class Order < ActiveRecord::Base
+class Order < ApplicationRecord
   before_save :normalize_card_number,
     if: Proc.new { |order| order.paid_with_card? }
 end
@@ -328,7 +328,7 @@ end
 When writing conditional callbacks, it is possible to mix both `:if` and `:unless` in the same callback declaration:
 
 ```ruby
-class Comment < ActiveRecord::Base
+class Comment < ApplicationRecord
   after_create :send_email_to_author, if: :author_wants_emails?,
     unless: Proc.new { |comment| comment.article.ignore_comments? }
 end
@@ -354,7 +354,7 @@ end
 When declared inside a class, as above, the callback methods will receive the model object as a parameter. We can now use the callback class in the model:
 
 ```ruby
-class PictureFile < ActiveRecord::Base
+class PictureFile < ApplicationRecord
   after_destroy PictureFileCallbacks.new
 end
 ```
@@ -374,7 +374,7 @@ end
 If the callback method is declared this way, it won't be necessary to instantiate a `PictureFileCallbacks` object.
 
 ```ruby
-class PictureFile < ActiveRecord::Base
+class PictureFile < ApplicationRecord
   after_destroy PictureFileCallbacks
 end
 ```
@@ -398,7 +398,7 @@ end
 By using the `after_commit` callback we can account for this case.
 
 ```ruby
-class PictureFile < ActiveRecord::Base
+class PictureFile < ApplicationRecord
   after_commit :delete_picture_file_from_disk, on: [:destroy]
 
   def delete_picture_file_from_disk
@@ -420,7 +420,7 @@ common, there are aliases for those operations:
 * `after_destroy_commit`
 
 ```ruby
-class PictureFile < ActiveRecord::Base
+class PictureFile < ApplicationRecord
   after_destroy_commit :delete_picture_file_from_disk
 
   def delete_picture_file_from_disk
diff --git a/guides/source/active_record_postgresql.md b/guides/source/active_record_postgresql.md
index 742db7be32..b592209d4b 100644
--- a/guides/source/active_record_postgresql.md
+++ b/guides/source/active_record_postgresql.md
@@ -39,7 +39,7 @@ create_table :documents do |t|
 end
 
 # app/models/document.rb
-class Document < ActiveRecord::Base
+class Document < ApplicationRecord
 end
 
 # Usage
@@ -63,7 +63,7 @@ add_index :books, :tags, using: 'gin'
 add_index :books, :ratings, using: 'gin'
 
 # app/models/book.rb
-class Book < ActiveRecord::Base
+class Book < ApplicationRecord
 end
 
 # Usage
@@ -97,7 +97,7 @@ ActiveRecord::Schema.define do
 end
 
 # app/models/profile.rb
-class Profile < ActiveRecord::Base
+class Profile < ApplicationRecord
 end
 
 # Usage
@@ -122,7 +122,7 @@ create_table :events do |t|
 end
 
 # app/models/event.rb
-class Event < ActiveRecord::Base
+class Event < ApplicationRecord
 end
 
 # Usage
@@ -150,7 +150,7 @@ create_table :events do |t|
 end
 
 # app/models/event.rb
-class Event < ActiveRecord::Base
+class Event < ApplicationRecord
 end
 
 # Usage
@@ -200,7 +200,7 @@ create_table :contacts do |t|
 end
 
 # app/models/contact.rb
-class Contact < ActiveRecord::Base
+class Contact < ApplicationRecord
 end
 
 # Usage
@@ -239,7 +239,7 @@ def down
 end
 
 # app/models/article.rb
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
 end
 
 # Usage
@@ -294,7 +294,7 @@ create_table :revisions do |t|
 end
 
 # app/models/revision.rb
-class Revision < ActiveRecord::Base
+class Revision < ApplicationRecord
 end
 
 # Usage
@@ -317,12 +317,12 @@ create_table :comments, id: :uuid, default: 'gen_random_uuid()' do |t|
 end
 
 # app/models/post.rb
-class Post < ActiveRecord::Base
+class Post < ApplicationRecord
   has_many :comments
 end
 
 # app/models/comment.rb
-class Comment < ActiveRecord::Base
+class Comment < ApplicationRecord
   belongs_to :post
 end
 ```
@@ -341,7 +341,7 @@ create_table :users, force: true do |t|
 end
 
 # app/models/device.rb
-class User < ActiveRecord::Base
+class User < ApplicationRecord
 end
 
 # Usage
@@ -370,7 +370,7 @@ create_table(:devices, force: true) do |t|
 end
 
 # app/models/device.rb
-class Device < ActiveRecord::Base
+class Device < ApplicationRecord
 end
 
 # Usage
@@ -410,7 +410,7 @@ create_table :devices, id: :uuid, default: 'gen_random_uuid()' do |t|
 end
 
 # app/models/device.rb
-class Device < ActiveRecord::Base
+class Device < ApplicationRecord
 end
 
 # Usage
@@ -434,7 +434,7 @@ end
 execute "CREATE INDEX documents_idx ON documents USING gin(to_tsvector('english', title || ' ' || body));"
 
 # app/models/document.rb
-class Document < ActiveRecord::Base
+class Document < ApplicationRecord
 end
 
 # Usage
@@ -484,7 +484,7 @@ CREATE VIEW articles AS
   SQL
 
 # app/models/article.rb
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   self.primary_key = "id"
   def archive!
     update_attribute :archived, true
diff --git a/guides/source/active_record_querying.md b/guides/source/active_record_querying.md
index ed1c3e7061..4606ac4683 100644
--- a/guides/source/active_record_querying.md
+++ b/guides/source/active_record_querying.md
@@ -25,7 +25,7 @@ Code examples throughout this guide will refer to one or more of the following m
 TIP: All of the following models use `id` as the primary key, unless specified otherwise.
 
 ```ruby
-class Client < ActiveRecord::Base
+class Client < ApplicationRecord
   has_one :address
   has_many :orders
   has_and_belongs_to_many :roles
@@ -33,19 +33,19 @@ end
 ```
 
 ```ruby
-class Address < ActiveRecord::Base
+class Address < ApplicationRecord
   belongs_to :client
 end
 ```
 
 ```ruby
-class Order < ActiveRecord::Base
+class Order < ApplicationRecord
   belongs_to :client, counter_cache: true
 end
 ```
 
 ```ruby
-class Role < ActiveRecord::Base
+class Role < ApplicationRecord
   has_and_belongs_to_many :clients
 end
 ```
@@ -740,7 +740,7 @@ SELECT "articles".* FROM "articles" WHERE (id > 10) ORDER BY id desc LIMIT 20
 The `reorder` method overrides the default scope order. For example:
 
 ```ruby
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   has_many :comments, -> { order('posted_at DESC') }
 end
 
@@ -889,7 +889,7 @@ This behavior can be turned off by setting `ActiveRecord::Base.lock_optimistical
 To override the name of the `lock_version` column, `ActiveRecord::Base` provides a class attribute called `locking_column`:
 
 ```ruby
-class Client < ActiveRecord::Base
+class Client < ApplicationRecord
   self.locking_column = :lock_client_column
 end
 ```
@@ -970,26 +970,26 @@ Active Record lets you use the names of the [associations](association_basics.ht
 For example, consider the following `Category`, `Article`, `Comment`, `Guest` and `Tag` models:
 
 ```ruby
-class Category < ActiveRecord::Base
+class Category < ApplicationRecord
   has_many :articles
 end
 
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   belongs_to :category
   has_many :comments
   has_many :tags
 end
 
-class Comment < ActiveRecord::Base
+class Comment < ApplicationRecord
   belongs_to :article
   has_one :guest
 end
 
-class Guest < ActiveRecord::Base
+class Guest < ApplicationRecord
   belongs_to :comment
 end
 
-class Tag < ActiveRecord::Base
+class Tag < ApplicationRecord
   belongs_to :article
 end
 ```
@@ -1199,7 +1199,7 @@ Scoping allows you to specify commonly-used queries which can be referenced as m
 To define a simple scope, we use the `scope` method inside the class, passing the query that we'd like to run when this scope is called:
 
 ```ruby
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   scope :published, -> { where(published: true) }
 end
 ```
@@ -1207,7 +1207,7 @@ end
 This is exactly the same as defining a class method, and which you use is a matter of personal preference:
 
 ```ruby
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   def self.published
     where(published: true)
   end
@@ -1217,7 +1217,7 @@ end
 Scopes are also chainable within scopes:
 
 ```ruby
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   scope :published,               -> { where(published: true) }
   scope :published_and_commented, -> { published.where("comments_count > 0") }
 end
@@ -1241,7 +1241,7 @@ category.articles.published # => [published articles belonging to this category]
 Your scope can take arguments:
 
 ```ruby
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   scope :created_before, ->(time) { where("created_at < ?", time) }
 end
 ```
@@ -1255,7 +1255,7 @@ Article.created_before(Time.zone.now)
 However, this is just duplicating the functionality that would be provided to you by a class method.
 
 ```ruby
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   def self.created_before(time)
     where("created_at < ?", time)
   end
@@ -1274,7 +1274,7 @@ If we wish for a scope to be applied across all queries to the model we can use
 `default_scope` method within the model itself.
 
 ```ruby
-class Client < ActiveRecord::Base
+class Client < ApplicationRecord
   default_scope { where("removed_at IS NULL") }
 end
 ```
@@ -1290,7 +1290,7 @@ If you need to do more complex things with a default scope, you can alternativel
 define it as a class method:
 
 ```ruby
-class Client < ActiveRecord::Base
+class Client < ApplicationRecord
   def self.default_scope
     # Should return an ActiveRecord::Relation.
   end
@@ -1301,7 +1301,7 @@ NOTE: The `default_scope` is also applied while creating/building a record.
 It is not applied while updating a record. E.g.:
 
 ```ruby
-class Client < ActiveRecord::Base
+class Client < ApplicationRecord
   default_scope { where(active: true) }
 end
 
@@ -1314,7 +1314,7 @@ Client.unscoped.new # => #<Client id: nil, active: nil>
 Just like `where` clauses scopes are merged using `AND` conditions.
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   scope :active, -> { where state: 'active' }
   scope :inactive, -> { where state: 'inactive' }
 end
@@ -1343,7 +1343,7 @@ One important caveat is that `default_scope` will be prepended in
 `scope` and `where` conditions.
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   default_scope { where state: 'pending' }
   scope :active, -> { where state: 'active' }
   scope :inactive, -> { where state: 'inactive' }
@@ -1405,7 +1405,7 @@ Enums
 The `enum` macro maps an integer column to a set of possible values.
 
 ```ruby
-class Book < ActiveRecord::Base
+class Book < ApplicationRecord
   enum availability: [:available, :unavailable]
 end
 ```
@@ -1657,7 +1657,7 @@ a large or often-running query. However, any model method overrides will
 not be available. For example:
 
 ```ruby
-class Client < ActiveRecord::Base
+class Client < ApplicationRecord
   def name
     "I am #{super}"
   end
@@ -1692,7 +1692,7 @@ Person.ids
 ```
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   self.primary_key = "person_id"
 end
 
diff --git a/guides/source/active_record_validations.md b/guides/source/active_record_validations.md
index ec31385077..dd7adf09a2 100644
--- a/guides/source/active_record_validations.md
+++ b/guides/source/active_record_validations.md
@@ -20,7 +20,7 @@ Validations Overview
 Here's an example of a very simple validation:
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: true
 end
 
@@ -80,7 +80,7 @@ method to determine whether an object is already in the database or not.
 Consider the following simple Active Record class:
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
 end
 ```
 
@@ -157,7 +157,7 @@ and returns true if no errors were found in the object, and false otherwise.
 As you saw above:
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: true
 end
 
@@ -175,7 +175,7 @@ even if it's technically invalid, because validations are automatically run
 only when the object is saved, such as with the `create` or `save` methods.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: true
 end
 
@@ -221,7 +221,7 @@ it doesn't verify the validity of the object as a whole. It only checks to see
 whether there are errors found on an individual attribute of the object.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: true
 end
 
@@ -239,7 +239,7 @@ To check which validations failed on an invalid attribute, you can use
 key to get the symbol of the validator:
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: true
 end
 
@@ -285,7 +285,7 @@ the field does exist in your database, the `accept` option must be set to
 `true` or else the validation will not run.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :terms_of_service, acceptance: true
 end
 ```
@@ -297,7 +297,7 @@ It can receive an `:accept` option, which determines the value that will be
 considered acceptance. It defaults to "1" and can be easily changed.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :terms_of_service, acceptance: { accept: 'yes' }
 end
 ```
@@ -309,7 +309,7 @@ and they also need to be validated. When you try to save your object, `valid?`
 will be called upon each one of the associated objects.
 
 ```ruby
-class Library < ActiveRecord::Base
+class Library < ApplicationRecord
   has_many :books
   validates_associated :books
 end
@@ -332,7 +332,7 @@ or a password. This validation creates a virtual attribute whose name is the
 name of the field that has to be confirmed with "_confirmation" appended.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :email, confirmation: true
 end
 ```
@@ -349,7 +349,7 @@ confirmation, make sure to add a presence check for the confirmation attribute
 (we'll take a look at `presence` later on in this guide):
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :email, confirmation: true
   validates :email_confirmation, presence: true
 end
@@ -360,7 +360,7 @@ confirmation constraint will be case sensitive or not. This option defaults to
 true.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :email, confirmation: { case_sensitive: false }
 end
 ```
@@ -373,7 +373,7 @@ This helper validates that the attributes' values are not included in a given
 set. In fact, this set can be any enumerable object.
 
 ```ruby
-class Account < ActiveRecord::Base
+class Account < ApplicationRecord
   validates :subdomain, exclusion: { in: %w(www us ca jp),
     message: "%{value} is reserved." }
 end
@@ -393,7 +393,7 @@ This helper validates the attributes' values by testing whether they match a
 given regular expression, which is specified using the `:with` option.
 
 ```ruby
-class Product < ActiveRecord::Base
+class Product < ApplicationRecord
   validates :legacy_code, format: { with: /\A[a-zA-Z]+\z/,
     message: "only allows letters" }
 end
@@ -409,7 +409,7 @@ This helper validates that the attributes' values are included in a given set.
 In fact, this set can be any enumerable object.
 
 ```ruby
-class Coffee < ActiveRecord::Base
+class Coffee < ApplicationRecord
   validates :size, inclusion: { in: %w(small medium large),
     message: "%{value} is not a valid size" }
 end
@@ -428,7 +428,7 @@ This helper validates the length of the attributes' values. It provides a
 variety of options, so you can specify length constraints in different ways:
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, length: { minimum: 2 }
   validates :bio, length: { maximum: 500 }
   validates :password, length: { in: 6..20 }
@@ -451,7 +451,7 @@ number corresponding to the length constraint being used. You can still use the
 `:message` option to specify an error message.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :bio, length: { maximum: 1000,
     too_long: "%{count} characters is the maximum allowed" }
 end
@@ -483,7 +483,7 @@ WARNING. Note that the regular expression above allows a trailing newline
 character.
 
 ```ruby
-class Player < ActiveRecord::Base
+class Player < ApplicationRecord
   validates :points, numericality: true
   validates :games_played, numericality: { only_integer: true }
 end
@@ -521,7 +521,7 @@ This helper validates that the specified attributes are not empty. It uses the
 is, a string that is either empty or consists of whitespace.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, :login, :email, presence: true
 end
 ```
@@ -531,7 +531,7 @@ whether the associated object itself is present, and not the foreign key used
 to map the association.
 
 ```ruby
-class LineItem < ActiveRecord::Base
+class LineItem < ApplicationRecord
   belongs_to :order
   validates :order, presence: true
 end
@@ -541,7 +541,7 @@ In order to validate associated records whose presence is required, you must
 specify the `:inverse_of` option for the association:
 
 ```ruby
-class Order < ActiveRecord::Base
+class Order < ApplicationRecord
   has_many :line_items, inverse_of: :order
 end
 ```
@@ -568,7 +568,7 @@ This helper validates that the specified attributes are absent. It uses the
 is, a string that is either empty or consists of whitespace.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, :login, :email, absence: true
 end
 ```
@@ -578,7 +578,7 @@ whether the associated object itself is absent, and not the foreign key used
 to map the association.
 
 ```ruby
-class LineItem < ActiveRecord::Base
+class LineItem < ApplicationRecord
   belongs_to :order
   validates :order, absence: true
 end
@@ -588,7 +588,7 @@ In order to validate associated records whose absence is required, you must
 specify the `:inverse_of` option for the association:
 
 ```ruby
-class Order < ActiveRecord::Base
+class Order < ApplicationRecord
   has_many :line_items, inverse_of: :order
 end
 ```
@@ -611,7 +611,7 @@ with the same value for a column that you intend to be unique. To avoid that,
 you must create a unique index on that column in your database.
 
 ```ruby
-class Account < ActiveRecord::Base
+class Account < ApplicationRecord
   validates :email, uniqueness: true
 end
 ```
@@ -623,7 +623,7 @@ There is a `:scope` option that you can use to specify one or more attributes th
 are used to limit the uniqueness check:
 
 ```ruby
-class Holiday < ActiveRecord::Base
+class Holiday < ApplicationRecord
   validates :name, uniqueness: { scope: :year,
     message: "should happen once per year" }
 end
@@ -635,7 +635,7 @@ uniqueness constraint will be case sensitive or not. This option defaults to
 true.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, uniqueness: { case_sensitive: false }
 end
 ```
@@ -658,7 +658,7 @@ class GoodnessValidator < ActiveModel::Validator
   end
 end
 
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates_with GoodnessValidator
 end
 ```
@@ -686,7 +686,7 @@ class GoodnessValidator < ActiveModel::Validator
   end
 end
 
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates_with GoodnessValidator, fields: [:first_name, :last_name]
 end
 ```
@@ -699,7 +699,7 @@ If your validator is complex enough that you want instance variables, you can
 easily use a plain old Ruby object instead:
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validate do |person|
     GoodnessValidator.new(person).validate
   end
@@ -728,7 +728,7 @@ passed to `validates_each` will be tested against it. In the following example,
 we don't want names and surnames to begin with lower case.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates_each :name, :surname do |record, attr, value|
     record.errors.add(attr, 'must start with upper case') if value =~ /\A[[:lower:]]/
   end
@@ -751,7 +751,7 @@ The `:allow_nil` option skips the validation when the value being validated is
 `nil`.
 
 ```ruby
-class Coffee < ActiveRecord::Base
+class Coffee < ApplicationRecord
   validates :size, inclusion: { in: %w(small medium large),
     message: "%{value} is not a valid size" }, allow_nil: true
 end
@@ -764,7 +764,7 @@ will let validation pass if the attribute's value is `blank?`, like `nil` or an
 empty string for example.
 
 ```ruby
-class Topic < ActiveRecord::Base
+class Topic < ApplicationRecord
   validates :title, length: { is: 5 }, allow_blank: true
 end
 
@@ -787,7 +787,7 @@ A `Proc` `:message` value is given two arguments: a message key for i18n, and
 a hash with `:model`, `:attribute`, and `:value` key-value pairs.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   # Hard-coded message
   validates :name, presence: { message: "must be given please" }
 
@@ -818,7 +818,7 @@ new record is created or `on: :update` to run the validation only when a record
 is updated.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   # it will be possible to update email with a duplicated value
   validates :email, uniqueness: true, on: :create
 
@@ -837,7 +837,7 @@ You can also specify validations to be strict and raise
 `ActiveModel::StrictValidationFailed` when the object is invalid.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: { strict: true }
 end
 
@@ -847,7 +847,7 @@ Person.new.valid?  # => ActiveModel::StrictValidationFailed: Name can't be blank
 There is also the ability to pass a custom exception to the `:strict` option.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :token, presence: true, uniqueness: true, strict: TokenGenerationException
 end
 
@@ -871,7 +871,7 @@ to the name of a method that will get called right before validation happens.
 This is the most commonly used option.
 
 ```ruby
-class Order < ActiveRecord::Base
+class Order < ApplicationRecord
   validates :card_number, presence: true, if: :paid_with_card?
 
   def paid_with_card?
@@ -887,7 +887,7 @@ contain valid Ruby code. You should use this option only when the string
 represents a really short condition.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :surname, presence: true, if: "name.nil?"
 end
 ```
@@ -900,7 +900,7 @@ inline condition instead of a separate method. This option is best suited for
 one-liners.
 
 ```ruby
-class Account < ActiveRecord::Base
+class Account < ApplicationRecord
   validates :password, confirmation: true,
     unless: Proc.new { |a| a.password.blank? }
 end
@@ -912,7 +912,7 @@ Sometimes it is useful to have multiple validations use one condition. It can
 be easily achieved using `with_options`.
 
 ```ruby
-class User < ActiveRecord::Base
+class User < ApplicationRecord
   with_options if: :is_admin? do |admin|
     admin.validates :password, length: { minimum: 10 }
     admin.validates :email, presence: true
@@ -930,7 +930,7 @@ should happen, an `Array` can be used. Moreover, you can apply both `:if` and
 `:unless` to the same validation.
 
 ```ruby
-class Computer < ActiveRecord::Base
+class Computer < ApplicationRecord
   validates :mouse, presence: true,
                     if: ["market.retail?", :desktop?],
                     unless: Proc.new { |c| c.trackpad.present? }
@@ -984,7 +984,7 @@ class EmailValidator < ActiveModel::EachValidator
   end
 end
 
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :email, presence: true, email: true
 end
 ```
@@ -1008,7 +1008,7 @@ so your custom validation methods should add errors to it when you
 wish validation to fail:
 
 ```ruby
-class Invoice < ActiveRecord::Base
+class Invoice < ApplicationRecord
   validate :expiration_date_cannot_be_in_the_past,
     :discount_cannot_be_greater_than_total_value
 
@@ -1032,7 +1032,7 @@ custom validations by giving an `:on` option to the `validate` method,
 with either: `:create` or `:update`.
 
 ```ruby
-class Invoice < ActiveRecord::Base
+class Invoice < ApplicationRecord
   validate :active_customer, on: :create
 
   def active_customer
@@ -1053,7 +1053,7 @@ The following is a list of the most commonly used methods. Please refer to the `
 Returns an instance of the class `ActiveModel::Errors` containing all errors. Each key is the attribute name and the value is an array of strings with all errors.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: true, length: { minimum: 3 }
 end
 
@@ -1072,7 +1072,7 @@ person.errors.messages # => {}
 `errors[]` is used when you want to check the error messages for a specific attribute. It returns an array of strings with all error messages for the given attribute, each string with one error message. If there are no errors related to the attribute, it returns an empty array.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: true, length: { minimum: 3 }
 end
 
@@ -1097,7 +1097,7 @@ The `add` method lets you add an error message related to a particular attribute
 The `errors.full_messages` method (or its equivalent, `errors.to_a`) returns the error messages in a user-friendly format, with the capitalized attribute name prepended to each message, as shown in the examples below.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   def a_method_used_for_validation_purposes
     errors.add(:name, "cannot contain the characters !@#%*()_-+=")
   end
@@ -1115,7 +1115,7 @@ person.errors.full_messages
 An equivalent to `errors#add` is to use `<<` to append a message to the `errors.messages` array for an attribute:
 
 ```ruby
-  class Person < ActiveRecord::Base
+  class Person < ApplicationRecord
     def a_method_used_for_validation_purposes
       errors.messages[:name] << "cannot contain the characters !@#%*()_-+="
     end
@@ -1136,7 +1136,7 @@ You can specify a validator type to the returned error details hash using the
 `errors.add` method.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   def a_method_used_for_validation_purposes
     errors.add(:name, :invalid_characters)
   end
@@ -1152,7 +1152,7 @@ To improve the error details to contain the unallowed characters set for instanc
 you can pass additional keys to `errors.add`.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   def a_method_used_for_validation_purposes
     errors.add(:name, :invalid_characters, not_allowed: "!@#%*()_-+=")
   end
@@ -1172,7 +1172,7 @@ validator type.
 You can add error messages that are related to the object's state as a whole, instead of being related to a specific attribute. You can use this method when you want to say that the object is invalid, no matter the values of its attributes. Since `errors[:base]` is an array, you can simply add a string to it and it will be used as an error message.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   def a_method_used_for_validation_purposes
     errors[:base] << "This person is invalid because ..."
   end
@@ -1184,7 +1184,7 @@ end
 The `clear` method is used when you intentionally want to clear all the messages in the `errors` collection. Of course, calling `errors.clear` upon an invalid object won't actually make it valid: the `errors` collection will now be empty, but the next time you call `valid?` or any method that tries to save this object to the database, the validations will run again. If any of the validations fail, the `errors` collection will be filled again.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: true, length: { minimum: 3 }
 end
 
@@ -1207,7 +1207,7 @@ p.errors[:name]
 The `size` method returns the total number of error messages for the object.
 
 ```ruby
-class Person < ActiveRecord::Base
+class Person < ApplicationRecord
   validates :name, presence: true, length: { minimum: 3 }
 end
 
diff --git a/guides/source/engines.md b/guides/source/engines.md
index a50ef9a95f..8382bde4d3 100644
--- a/guides/source/engines.md
+++ b/guides/source/engines.md
@@ -508,7 +508,7 @@ Turning the model into this:
 
 ```ruby
 module Blorgh
-  class Article < ActiveRecord::Base
+  class Article < ApplicationRecord
     has_many :comments
   end
 end
@@ -1129,7 +1129,7 @@ end
 ```ruby
 # Blorgh/app/models/article.rb
 
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   has_many :comments
 end
 ```
@@ -1150,7 +1150,7 @@ end
 ```ruby
 # Blorgh/app/models/article.rb
 
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   has_many :comments
   def summary
     "#{title}"
@@ -1171,7 +1171,7 @@ classes at run time allowing you to significantly modularize your code.
 ```ruby
 # MyApp/app/models/blorgh/article.rb
 
-class Blorgh::Article < ActiveRecord::Base
+class Blorgh::Article < ApplicationRecord
   include Blorgh::Concerns::Models::Article
 
   def time_since_created
@@ -1187,7 +1187,7 @@ end
 ```ruby
 # Blorgh/app/models/article.rb
 
-class Article < ActiveRecord::Base
+class Article < ApplicationRecord
   include Blorgh::Concerns::Models::Article
 end
 ```
diff --git a/guides/source/plugins.md b/guides/source/plugins.md
index 922bbb4f73..ae8c30515a 100644
--- a/guides/source/plugins.md
+++ b/guides/source/plugins.md
@@ -17,7 +17,7 @@ After reading this guide, you will know:
 This guide describes how to build a test-driven plugin that will:
 
 * Extend core Ruby classes like Hash and String.
-* Add methods to `ActiveRecord::Base` in the tradition of the `acts_as` plugins.
+* Add methods to `ApplicationRecord` in the tradition of the `acts_as` plugins.
 * Give you information about where to put generators in your plugin.
 
 For the purpose of this guide pretend for a moment that you are an avid bird watcher.
@@ -182,7 +182,6 @@ To start out, write a failing test that shows the behavior you'd like:
 require 'test_helper'
 
 class ActsAsYaffleTest < ActiveSupport::TestCase
-
   def test_a_hickwalls_yaffle_text_field_should_be_last_squawk
     assert_equal "last_squawk", Hickwall.yaffle_text_field
   end
@@ -190,7 +189,6 @@ class ActsAsYaffleTest < ActiveSupport::TestCase
   def test_a_wickwalls_yaffle_text_field_should_be_last_tweet
     assert_equal "last_tweet", Wickwall.yaffle_text_field
   end
-
 end
 ```
 
@@ -234,22 +232,22 @@ like yaffles.
 ```ruby
 # test/dummy/app/models/hickwall.rb
 
-class Hickwall < ActiveRecord::Base
+class Hickwall < ApplicationRecord
   acts_as_yaffle
 end
 
 # test/dummy/app/models/wickwall.rb
 
-class Wickwall < ActiveRecord::Base
+class Wickwall < ApplicationRecord
   acts_as_yaffle yaffle_text_field: :last_tweet
 end
-
 ```
 
 We will also add code to define the `acts_as_yaffle` method.
 
 ```ruby
 # yaffle/lib/yaffle/acts_as_yaffle.rb
+
 module Yaffle
   module ActsAsYaffle
     extend ActiveSupport::Concern
@@ -265,7 +263,13 @@ module Yaffle
   end
 end
 
-ActiveRecord::Base.include(Yaffle::ActsAsYaffle)
+# test/dummy/app/models/application_record.rb
+
+class ApplicationRecord < ActiveRecord::Base
+  include Yaffle::ActsAsYaffle
+
+  self.abstract_class = true
+end
 ```
 
 You can then return to the root directory (`cd ../..`) of your plugin and rerun the tests using `rake`.
@@ -308,7 +312,13 @@ module Yaffle
   end
 end
 
-ActiveRecord::Base.include(Yaffle::ActsAsYaffle)
+# test/dummy/app/models/application_record.rb
+
+class ApplicationRecord < ActiveRecord::Base
+  include Yaffle::ActsAsYaffle
+
+  self.abstract_class = true
+end
 ```
 
 When you run `rake`, you should see the tests all pass:
@@ -329,7 +339,6 @@ To start out, write a failing test that shows the behavior you'd like:
 require 'test_helper'
 
 class ActsAsYaffleTest < ActiveSupport::TestCase
-
   def test_a_hickwalls_yaffle_text_field_should_be_last_squawk
     assert_equal "last_squawk", Hickwall.yaffle_text_field
   end
@@ -382,7 +391,13 @@ module Yaffle
   end
 end
 
-ActiveRecord::Base.include(Yaffle::ActsAsYaffle)
+# test/dummy/app/models/application_record.rb
+
+class ApplicationRecord < ActiveRecord::Base
+  include Yaffle::ActsAsYaffle
+
+  self.abstract_class = true
+end
 ```
 
 Run `rake` one final time and you should see:
diff --git a/guides/source/security.md b/guides/source/security.md
index df8c24864e..b301736c36 100644
--- a/guides/source/security.md
+++ b/guides/source/security.md
@@ -381,9 +381,9 @@ Refer to the Injection section for countermeasures against XSS. It is _recommend
 
 **CSRF** Cross-Site Request Forgery (CSRF), also known as Cross-Site Reference Forgery (XSRF), is a gigantic attack method, it allows the attacker to do everything the administrator or Intranet user may do. As you have already seen above how CSRF works, here are a few examples of what attackers can do in the Intranet or admin interface.
 
-A real-world example is a [router reconfiguration by CSRF](http://www.h-online.com/security/news/item/Symantec-reports-first-active-attack-on-a-DSL-router-735883.html). The attackers sent a malicious e-mail, with CSRF in it, to Mexican users. The e-mail claimed there was an e-card waiting for them, but it also contained an image tag that resulted in a HTTP-GET request to reconfigure the user's router (which is a popular model in Mexico). The request changed the DNS-settings so that requests to a Mexico-based banking site would be mapped to the attacker's site. Everyone who accessed the banking site through that router saw the attacker's fake web site and had their credentials stolen.
+A real-world example is a [router reconfiguration by CSRF](http://www.h-online.com/security/news/item/Symantec-reports-first-active-attack-on-a-DSL-router-735883.html). The attackers sent a malicious e-mail, with CSRF in it, to Mexican users. The e-mail claimed there was an e-card waiting for the user, but it also contained an image tag that resulted in a HTTP-GET request to reconfigure the user's router (which is a popular model in Mexico). The request changed the DNS-settings so that requests to a Mexico-based banking site would be mapped to the attacker's site. Everyone who accessed the banking site through that router saw the attacker's fake web site and had their credentials stolen.
 
-Another example changed Google Adsense's e-mail address and password by. If the victim was logged into Google Adsense, the administration interface for Google advertisements campaigns, an attacker could change their credentials.

+Another example changed Google Adsense's e-mail address and password. If the victim was logged into Google Adsense, the administration interface for Google advertisement campaigns, an attacker could change the credentials of the victim.

 
 Another popular attack is to spam your web application, your blog or forum to propagate malicious XSS. Of course, the attacker has to know the URL structure, but most Rails URLs are quite straightforward or they will be easy to find out, if it is an open-source application's admin interface. The attacker may even do 1,000 lucky guesses by just including malicious IMG-tags which try every possible combination.
 
diff --git a/guides/source/upgrading_ruby_on_rails.md b/guides/source/upgrading_ruby_on_rails.md
index fa6a01671b..9ba5021c4a 100644
--- a/guides/source/upgrading_ruby_on_rails.md
+++ b/guides/source/upgrading_ruby_on_rails.md
@@ -53,7 +53,7 @@ Don't forget to review the difference, to see if there were any unexpected chang
 Upgrading from Rails 4.2 to Rails 5.0
 -------------------------------------
 
-### Halting callback chains by returning `false`
+### Halting callback chains via `throw(:abort)`
 
 In Rails 4.2, when a 'before' callback returns `false` in Active Record
 and Active Model, then the entire callback chain is halted. In other words,
diff --git a/railties/lib/rails/generators/app_base.rb b/railties/lib/rails/generators/app_base.rb
index 792d0ddd40..c4f4d834e1 100644
--- a/railties/lib/rails/generators/app_base.rb
+++ b/railties/lib/rails/generators/app_base.rb
@@ -221,8 +221,6 @@ module Rails
       def rails_gemfile_entry
         dev_edge_common = [
             GemfileEntry.github('sprockets-rails', 'rails/sprockets-rails'),
-            GemfileEntry.github('sprockets', 'rails/sprockets'),
-            GemfileEntry.github('sass-rails', 'rails/sass-rails'),
             GemfileEntry.github('arel', 'rails/arel'),
             GemfileEntry.github('rack', 'rack/rack')
           ]
@@ -281,10 +279,8 @@ module Rails
       end
 
       def jbuilder_gemfile_entry
-        return [] if options[:api]
-
         comment = 'Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder'
-        GemfileEntry.version('jbuilder', '~> 2.0', comment)
+        GemfileEntry.new 'jbuilder', '~> 2.0', comment, {}, options[:api]
       end
 
       def coffee_gemfile_entry
diff --git a/railties/lib/rails/generators/named_base.rb b/railties/lib/rails/generators/named_base.rb
index 243694f38e..658d883883 100644
--- a/railties/lib/rails/generators/named_base.rb
+++ b/railties/lib/rails/generators/named_base.rb
@@ -129,6 +129,18 @@ module Rails
           uncountable? ? "#{plural_table_name}_index" : plural_table_name
         end
 
+        def show_helper
+          "#{singular_table_name}_url(@#{singular_table_name})"
+        end
+
+        def edit_helper
+          "edit_#{show_helper}"
+        end
+
+        def new_helper
+          "new_#{singular_table_name}_url"
+        end
+
         def singular_table_name
           @singular_table_name ||= (pluralize_table_names? ? table_name.singularize : table_name)
         end
diff --git a/railties/lib/rails/generators/rails/app/app_generator.rb b/railties/lib/rails/generators/rails/app/app_generator.rb
index 889154494d..9997cf3b35 100644
--- a/railties/lib/rails/generators/rails/app/app_generator.rb
+++ b/railties/lib/rails/generators/rails/app/app_generator.rb
@@ -293,6 +293,12 @@ module Rails
         end
       end
 
+      def delete_application_record_skipping_active_record
+        if options[:skip_active_record]
+          remove_file 'app/models/application_record.rb'
+        end
+      end
+
       def delete_active_record_initializers_skipping_active_record
         if options[:skip_active_record]
           remove_file 'config/initializers/active_record_belongs_to_required_by_default.rb'
diff --git a/railties/lib/rails/generators/rails/app/templates/Gemfile b/railties/lib/rails/generators/rails/app/templates/Gemfile
index 2f7ffc055d..4384d9b6eb 100644
--- a/railties/lib/rails/generators/rails/app/templates/Gemfile
+++ b/railties/lib/rails/generators/rails/app/templates/Gemfile
@@ -22,9 +22,6 @@ source 'https://rubygems.org'
 # gem 'capistrano-rails', group: :development
 
 <%- if options.api? -%>
-# Use ActiveModelSerializers to serialize JSON responses
-gem 'active_model_serializers', '~> 0.10.0.rc2'
-
 # Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin AJAX possible
 # gem 'rack-cors'
 
diff --git a/railties/lib/rails/generators/rails/app/templates/app/models/application_record.rb b/railties/lib/rails/generators/rails/app/templates/app/models/application_record.rb
new file mode 100644
index 0000000000..10a4cba84d
--- /dev/null
+++ b/railties/lib/rails/generators/rails/app/templates/app/models/application_record.rb
@@ -0,0 +1,3 @@
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+end
diff --git a/railties/lib/rails/generators/rails/plugin/templates/app/models/application_record.rb.tt b/railties/lib/rails/generators/rails/plugin/templates/app/models/application_record.rb.tt
new file mode 100644
index 0000000000..8aa3de78f1
--- /dev/null
+++ b/railties/lib/rails/generators/rails/plugin/templates/app/models/application_record.rb.tt
@@ -0,0 +1,6 @@
+<%= wrap_in_modules <<-rb.strip_heredoc
+  class ApplicationRecord < ActiveRecord::Base
+    self.abstract_class = true
+  end
+rb
+%>
diff --git a/railties/lib/rails/generators/test_unit/controller/templates/functional_test.rb b/railties/lib/rails/generators/test_unit/controller/templates/functional_test.rb
index 5a8a3ca5e0..4f2ceb8589 100644
--- a/railties/lib/rails/generators/test_unit/controller/templates/functional_test.rb
+++ b/railties/lib/rails/generators/test_unit/controller/templates/functional_test.rb
@@ -1,11 +1,9 @@
 require 'test_helper'
 
 <% module_namespacing do -%>
-class <%= class_name %>ControllerTest < ActionController::TestCase
+class <%= class_name %>ControllerTest < ActionDispatch::IntegrationTest
 <% if mountable_engine? -%>
-  setup do
-    @routes = Engine.routes
-  end
+  include Engine.routes.url_helpers
 
 <% end -%>
 <% if actions.empty? -%>
@@ -15,7 +13,7 @@ class <%= class_name %>ControllerTest < ActionController::TestCase
 <% else -%>
 <% actions.each do |action| -%>
   test "should get <%= action %>" do
-    get :<%= action %>
+    get <%= file_name %>_<%= action %>_url
     assert_response :success
   end
 
diff --git a/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb b/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb
index f302cd6c3d..de5814eae9 100644
--- a/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb
+++ b/railties/lib/rails/generators/test_unit/scaffold/templates/api_functional_test.rb
@@ -1,40 +1,41 @@
 require 'test_helper'
 
 <% module_namespacing do -%>
-class <%= controller_class_name %>ControllerTest < ActionController::TestCase
+class <%= controller_class_name %>ControllerTest < ActionDispatch::IntegrationTest
+  <% if mountable_engine? -%>
+  include Engine.routes.url_helpers
+
+  <% end -%>
   setup do
     @<%= singular_table_name %> = <%= fixture_name %>(:one)
-<% if mountable_engine? -%>
-    @routes = Engine.routes
-<% end -%>
   end
 
   test "should get index" do
-    get :index
+    get <%= index_helper %>_url
     assert_response :success
   end
 
   test "should create <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count') do
-      post :create, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+      post <%= index_helper %>_url, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
     end
 
     assert_response 201
   end
 
   test "should show <%= singular_table_name %>" do
-    get :show, params: { id: <%= "@#{singular_table_name}" %> }
+    get <%= show_helper %>
     assert_response :success
   end
 
   test "should update <%= singular_table_name %>" do
-    patch :update, params: { id: <%= "@#{singular_table_name}" %>, <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+    patch <%= show_helper %>, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
     assert_response 200
   end
 
   test "should destroy <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count', -1) do
-      delete :destroy, params: { id: <%= "@#{singular_table_name}" %> }
+      delete <%= show_helper %>
     end
 
     assert_response 204
diff --git a/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb b/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb
index 50b98b2631..1989d84c79 100644
--- a/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb
+++ b/railties/lib/rails/generators/test_unit/scaffold/templates/functional_test.rb
@@ -1,50 +1,51 @@
 require 'test_helper'
 
 <% module_namespacing do -%>
-class <%= controller_class_name %>ControllerTest < ActionController::TestCase
+class <%= controller_class_name %>ControllerTest < ActionDispatch::IntegrationTest
+  <%- if mountable_engine? -%>
+  include Engine.routes.url_helpers
+  <% end -%>
+
   setup do
     @<%= singular_table_name %> = <%= fixture_name %>(:one)
-<% if mountable_engine? -%>
-    @routes = Engine.routes
-<% end -%>
   end
 
   test "should get index" do
-    get :index
+    get <%= index_helper %>_url
     assert_response :success
   end
 
   test "should get new" do
-    get :new
+    get <%= new_helper %>
     assert_response :success
   end
 
   test "should create <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count') do
-      post :create, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+      post <%= index_helper %>_url, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
     end
 
     assert_redirected_to <%= singular_table_name %>_path(<%= class_name %>.last)
   end
 
   test "should show <%= singular_table_name %>" do
-    get :show, params: { id: <%= "@#{singular_table_name}" %> }
+    get <%= show_helper %>
     assert_response :success
   end
 
   test "should get edit" do
-    get :edit, params: { id: <%= "@#{singular_table_name}" %> }
+    get <%= edit_helper %>
     assert_response :success
   end
 
   test "should update <%= singular_table_name %>" do
-    patch :update, params: { id: <%= "@#{singular_table_name}" %>, <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
+    patch <%= show_helper %>, params: { <%= "#{singular_table_name}: { #{attributes_hash} }" %> }
     assert_redirected_to <%= singular_table_name %>_path(<%= "@#{singular_table_name}" %>)
   end
 
   test "should destroy <%= singular_table_name %>" do
     assert_difference('<%= class_name %>.count', -1) do
-      delete :destroy, params: { id: <%= "@#{singular_table_name}" %> }
+      delete <%= show_helper %>
     end
 
     assert_redirected_to <%= index_helper %>_path
diff --git a/railties/test/application/asset_debugging_test.rb b/railties/test/application/asset_debugging_test.rb
index 8b83784ed6..0659110ac0 100644
--- a/railties/test/application/asset_debugging_test.rb
+++ b/railties/test/application/asset_debugging_test.rb
@@ -58,7 +58,7 @@ module ApplicationTests
       assert_no_match(/<script src="\/assets\/xmlhr-([0-z]+)\.js"><\/script>/, last_response.body)
     end
 
-    test "assets are served with sourcemaps when compile is true and debug_assets params is true" do
+    test "assets aren't concatenated when compile is true is on and debug_assets params is true" do
       add_to_env_config "production", "config.assets.compile = true"
 
       # Load app env
@@ -67,7 +67,8 @@ module ApplicationTests
       class ::PostsController < ActionController::Base ; end
 
       get '/posts?debug_assets=true'
-      assert_match(/<script src="\/assets\/application(\.debug)?-([0-z]+)\.js"><\/script>/, last_response.body)
+      assert_match(/<script src="\/assets\/application(\.self)?-([0-z]+)\.js\?body=1"><\/script>/, last_response.body)
+      assert_match(/<script src="\/assets\/xmlhr(\.self)?-([0-z]+)\.js\?body=1"><\/script>/, last_response.body)
     end
   end
 end
diff --git a/railties/test/application/assets_test.rb b/railties/test/application/assets_test.rb
index 18882e1855..7e9a9a5f3b 100644
--- a/railties/test/application/assets_test.rb
+++ b/railties/test/application/assets_test.rb
@@ -174,7 +174,7 @@ module ApplicationTests
 
       precompile!
 
-      assert_file_exists("#{app_path}/public/assets/something-*.js")
+      assert_file_exists("#{app_path}/public/assets/something/index-*.js")
     end
 
     test 'precompile use assets defined in app env config' do
@@ -410,7 +410,7 @@ module ApplicationTests
 
       precompile!
 
-      assert_equal "Post\n;\n", File.read(Dir["#{app_path}/public/assets/application-*.js"].first)
+      assert_equal "Post;\n", File.read(Dir["#{app_path}/public/assets/application-*.js"].first)
     end
 
     test "initialization on the assets group should set assets_dir" do
@@ -458,9 +458,9 @@ module ApplicationTests
       class ::PostsController < ActionController::Base; end
 
       get '/posts', {}, {'HTTPS'=>'off'}
-      assert_match('src="http://example.com/assets/application.debug.js', last_response.body)
+      assert_match('src="http://example.com/assets/application.self.js', last_response.body)
       get '/posts', {}, {'HTTPS'=>'on'}
-      assert_match('src="https://example.com/assets/application.debug.js', last_response.body)
+      assert_match('src="https://example.com/assets/application.self.js', last_response.body)
     end
 
     test "asset urls should be protocol-relative if no request is in scope" do
diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index 264f254bfe..b638ca1614 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -228,6 +228,7 @@ module ApplicationTests
     end
 
     test "the application can be eager loaded even when there are no frameworks" do
+      FileUtils.rm_rf("#{app_path}/app/models/application_record.rb")
       FileUtils.rm_rf("#{app_path}/config/environments")
       add_to_config <<-RUBY
         config.eager_load = true
diff --git a/railties/test/application/rake_test.rb b/railties/test/application/rake_test.rb
index 0da0928b48..6373c7b42b 100644
--- a/railties/test/application/rake_test.rb
+++ b/railties/test/application/rake_test.rb
@@ -98,7 +98,7 @@ module ApplicationTests
     end
 
     def test_code_statistics_sanity
-      assert_match "Code LOC: 7     Test LOC: 0     Code to Test Ratio: 1:0.0",
+      assert_match "Code LOC: 10     Test LOC: 0     Code to Test Ratio: 1:0.0",
         Dir.chdir(app_path){ `bin/rake stats` }
     end
 
@@ -186,7 +186,7 @@ module ApplicationTests
     def test_scaffold_tests_pass_by_default
       output = Dir.chdir(app_path) do
         `bin/rails generate scaffold user username:string password:string;
-         bin/rake db:migrate test`
+         RAILS_ENV=test bin/rake db:migrate test`
       end
 
       assert_match(/7 runs, 12 assertions, 0 failures, 0 errors/, output)
@@ -205,7 +205,7 @@ module ApplicationTests
 
       output = Dir.chdir(app_path) do
         `bin/rails generate scaffold user username:string password:string;
-         bin/rake db:migrate test`
+         RAILS_ENV=test bin/rake db:migrate test`
       end
 
       assert_match(/5 runs, 7 assertions, 0 failures, 0 errors/, output)
@@ -218,7 +218,7 @@ module ApplicationTests
 
       output = Dir.chdir(app_path) do
         `bin/rails generate scaffold LineItems product:references cart:belongs_to;
-         bin/rake db:migrate test`
+         RAILS_ENV=test bin/rake db:migrate test`
       end
 
       assert_match(/7 runs, 12 assertions, 0 failures, 0 errors/, output)
diff --git a/railties/test/generators/api_app_generator_test.rb b/railties/test/generators/api_app_generator_test.rb
index be2cd3a853..2c24a6e46a 100644
--- a/railties/test/generators/api_app_generator_test.rb
+++ b/railties/test/generators/api_app_generator_test.rb
@@ -37,9 +37,8 @@ class ApiAppGeneratorTest < Rails::Generators::TestCase
       assert_no_match(/gem 'coffee-rails'/, content)
       assert_no_match(/gem 'jquery-rails'/, content)
       assert_no_match(/gem 'sass-rails'/, content)
-      assert_no_match(/gem 'jbuilder'/, content)
       assert_no_match(/gem 'web-console'/, content)
-      assert_match(/gem 'active_model_serializers'/, content)
+      assert_match(/# gem 'jbuilder'/, content)
     end
 
     assert_file "config/application.rb" do |content|
diff --git a/railties/test/generators/app_generator_test.rb b/railties/test/generators/app_generator_test.rb
index 9f74282b28..d4b751cc0c 100644
--- a/railties/test/generators/app_generator_test.rb
+++ b/railties/test/generators/app_generator_test.rb
@@ -334,6 +334,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
     run_generator [destination_root, "--skip-active-record"]
     assert_no_file "config/database.yml"
     assert_no_file "config/initializers/active_record_belongs_to_required_by_default.rb"
+    assert_no_file "app/models/application_record.rb"
     assert_file "config/application.rb", /#\s+require\s+["']active_record\/railtie["']/
     assert_file "test/test_helper.rb" do |helper_content|
       assert_no_match(/fixtures :all/, helper_content)
diff --git a/railties/test/generators/model_generator_test.rb b/railties/test/generators/model_generator_test.rb
index e1722b84b3..fb502ec0c5 100644
--- a/railties/test/generators/model_generator_test.rb
+++ b/railties/test/generators/model_generator_test.rb
@@ -35,6 +35,17 @@ class ModelGeneratorTest < Rails::Generators::TestCase
     assert_no_migration "db/migrate/create_accounts.rb"
   end
 
+  def test_model_with_existent_application_record
+    mkdir_p "#{destination_root}/app/models"
+    touch "#{destination_root}/app/models/application_record.rb"
+
+    Dir.chdir(destination_root) do
+      run_generator ["account"]
+    end
+
+    assert_file "app/models/account.rb", /class Account < ApplicationRecord/
+  end
+
   def test_plural_names_are_singularized
     content = run_generator ["accounts".freeze]
     assert_file "app/models/account.rb", /class Account < ActiveRecord::Base/
diff --git a/railties/test/generators/namespaced_generators_test.rb b/railties/test/generators/namespaced_generators_test.rb
index 918faae74b..d76759a7d1 100644
--- a/railties/test/generators/namespaced_generators_test.rb
+++ b/railties/test/generators/namespaced_generators_test.rb
@@ -218,7 +218,7 @@ class NamespacedScaffoldGeneratorTest < NamespacedGeneratorTestCase
                 /class ProductLinesController < ApplicationController/
 
     assert_file "test/controllers/test_app/product_lines_controller_test.rb",
-                /module TestApp\n  class ProductLinesControllerTest < ActionController::TestCase/
+                /module TestApp\n  class ProductLinesControllerTest < ActionDispatch::IntegrationTest/
 
     # Views
     %w(index edit new show _form).each do |view|
@@ -285,7 +285,7 @@ class NamespacedScaffoldGeneratorTest < NamespacedGeneratorTestCase
     end
 
     assert_file "test/controllers/test_app/admin/roles_controller_test.rb",
-                /module TestApp\n  class Admin::RolesControllerTest < ActionController::TestCase/
+                /module TestApp\n  class Admin::RolesControllerTest < ActionDispatch::IntegrationTest/
 
     # Views
     %w(index edit new show _form).each do |view|
@@ -352,7 +352,7 @@ class NamespacedScaffoldGeneratorTest < NamespacedGeneratorTestCase
     end
 
     assert_file "test/controllers/test_app/admin/user/special/roles_controller_test.rb",
-                /module TestApp\n  class Admin::User::Special::RolesControllerTest < ActionController::TestCase/
+                /module TestApp\n  class Admin::User::Special::RolesControllerTest < ActionDispatch::IntegrationTest/
 
     # Views
     %w(index edit new show _form).each do |view|
@@ -418,6 +418,6 @@ class NamespacedScaffoldGeneratorTest < NamespacedGeneratorTestCase
       assert_match(%r(require_dependency "test_app/application_controller"), content)
     end
     assert_file "test/controllers/test_app/admin/roles_controller_test.rb",
-                /module TestApp\n  class Admin::RolesControllerTest < ActionController::TestCase/
+                /module TestApp\n  class Admin::RolesControllerTest < ActionDispatch::IntegrationTest/
   end
 end
diff --git a/railties/test/generators/resource_generator_test.rb b/railties/test/generators/resource_generator_test.rb
index 581d80d60e..addaf83bc8 100644
--- a/railties/test/generators/resource_generator_test.rb
+++ b/railties/test/generators/resource_generator_test.rb
@@ -33,7 +33,7 @@ class ResourceGeneratorTest < Rails::Generators::TestCase
   def test_resource_controller_with_pluralized_class_name
     run_generator
     assert_file "app/controllers/accounts_controller.rb", /class AccountsController < ApplicationController/
-    assert_file "test/controllers/accounts_controller_test.rb", /class AccountsControllerTest < ActionController::TestCase/
+    assert_file "test/controllers/accounts_controller_test.rb", /class AccountsControllerTest < ActionDispatch::IntegrationTest/
 
     assert_file "app/helpers/accounts_helper.rb", /module AccountsHelper/
   end
diff --git a/railties/test/generators/scaffold_controller_generator_test.rb b/railties/test/generators/scaffold_controller_generator_test.rb
index b4ba101017..c37e289f4b 100644
--- a/railties/test/generators/scaffold_controller_generator_test.rb
+++ b/railties/test/generators/scaffold_controller_generator_test.rb
@@ -104,10 +104,10 @@ class ScaffoldControllerGeneratorTest < Rails::Generators::TestCase
     run_generator ["User", "name:string", "age:integer", "organization:references{polymorphic}"]
 
     assert_file "test/controllers/users_controller_test.rb" do |content|
-      assert_match(/class UsersControllerTest < ActionController::TestCase/, content)
+      assert_match(/class UsersControllerTest < ActionDispatch::IntegrationTest/, content)
       assert_match(/test "should get index"/, content)
-      assert_match(/post :create, params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
-      assert_match(/patch :update, params: \{ id: @user, user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
+      assert_match(/post users_url, params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
+      assert_match(/patch user_url\(@user\), params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
     end
   end
 
@@ -115,10 +115,10 @@ class ScaffoldControllerGeneratorTest < Rails::Generators::TestCase
     run_generator ["User"]
 
     assert_file "test/controllers/users_controller_test.rb" do |content|
-      assert_match(/class UsersControllerTest < ActionController::TestCase/, content)
+      assert_match(/class UsersControllerTest < ActionDispatch::IntegrationTest/, content)
       assert_match(/test "should get index"/, content)
-      assert_match(/post :create, params: \{ user: \{  \} \}/, content)
-      assert_match(/patch :update, params: \{ id: @user, user: \{  \} \}/, content)
+      assert_match(/post users_url, params: \{ user: \{  \} \}/, content)
+      assert_match(/patch user_url\(@user\), params: \{ user: \{  \} \}/, content)
     end
   end
 
@@ -236,10 +236,10 @@ class ScaffoldControllerGeneratorTest < Rails::Generators::TestCase
     run_generator ["User", "name:string", "age:integer", "organization:references{polymorphic}", "--api"]
 
     assert_file "test/controllers/users_controller_test.rb" do |content|
-      assert_match(/class UsersControllerTest < ActionController::TestCase/, content)
+      assert_match(/class UsersControllerTest < ActionDispatch::IntegrationTest/, content)
       assert_match(/test "should get index"/, content)
-      assert_match(/post :create, params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
-      assert_match(/patch :update, params: \{ id: @user, user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
+      assert_match(/post users_url, params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
+      assert_match(/patch user_url\(@user\), params: \{ user: \{ age: @user\.age, name: @user\.name, organization_id: @user\.organization_id, organization_type: @user\.organization_type \} \}/, content)
       assert_no_match(/assert_redirected_to/, content)
     end
   end
diff --git a/railties/test/generators/scaffold_generator_test.rb b/railties/test/generators/scaffold_generator_test.rb
index 0c3808a9a0..eb81ea3d0e 100644
--- a/railties/test/generators/scaffold_generator_test.rb
+++ b/railties/test/generators/scaffold_generator_test.rb
@@ -57,9 +57,9 @@ class ScaffoldGeneratorTest < Rails::Generators::TestCase
     end
 
     assert_file "test/controllers/product_lines_controller_test.rb" do |test|
-      assert_match(/class ProductLinesControllerTest < ActionController::TestCase/, test)
-      assert_match(/post :create, params: \{ product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
-      assert_match(/patch :update, params: \{ id: @product_line, product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
+      assert_match(/class ProductLinesControllerTest < ActionDispatch::IntegrationTest/, test)
+      assert_match(/post product_lines_url, params: \{ product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
+      assert_match(/patch product_line_url\(@product_line\), params: \{ product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
     end
 
     # Views
@@ -135,9 +135,9 @@ class ScaffoldGeneratorTest < Rails::Generators::TestCase
     end
 
     assert_file "test/controllers/product_lines_controller_test.rb" do |test|
-      assert_match(/class ProductLinesControllerTest < ActionController::TestCase/, test)
-      assert_match(/post :create, params: \{ product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
-      assert_match(/patch :update, params: \{ id: @product_line, product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
+      assert_match(/class ProductLinesControllerTest < ActionDispatch::IntegrationTest/, test)
+      assert_match(/post product_lines_url, params: \{ product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
+      assert_match(/patch product_line_url\(@product_line\), params: \{ product_line: \{ product_id: @product_line\.product_id, title: @product_line\.title, user_id: @product_line\.user_id \} \}/, test)
       assert_no_match(/assert_redirected_to/, test)
     end
 
@@ -161,10 +161,10 @@ class ScaffoldGeneratorTest < Rails::Generators::TestCase
     run_generator ["product_line"]
 
     assert_file "test/controllers/product_lines_controller_test.rb" do |content|
-      assert_match(/class ProductLinesControllerTest < ActionController::TestCase/, content)
+      assert_match(/class ProductLinesControllerTest < ActionDispatch::IntegrationTest/, content)
       assert_match(/test "should get index"/, content)
-      assert_match(/post :create, params: \{ product_line: \{  \} \}/, content)
-      assert_match(/patch :update, params: \{ id: @product_line, product_line: \{  \} \}/, content)
+      assert_match(/post product_lines_url, params: \{ product_line: \{  \} \}/, content)
+      assert_match(/patch product_line_url\(@product_line\), params: \{ product_line: \{  \} \}/, content)
     end
   end
 
@@ -250,7 +250,7 @@ class ScaffoldGeneratorTest < Rails::Generators::TestCase
     end
 
     assert_file "test/controllers/admin/roles_controller_test.rb",
-                /class Admin::RolesControllerTest < ActionController::TestCase/
+                /class Admin::RolesControllerTest < ActionDispatch::IntegrationTest/
 
     # Views
     %w(index edit new show _form).each do |view|