Merge branch 'master' into loofah

Conflicts:
	actionpack/CHANGELOG.md
	actionpack/test/controller/integration_test.rb
	actionview/CHANGELOG.md

24 files changed, 186 insertions, 64 deletions

diff --git a/railties/lib/rails.rb b/railties/lib/rails.rb
index ecd8c22dd8..e7172e491f 100644
--- a/railties/lib/rails.rb
+++ b/railties/lib/rails.rb
@@ -29,7 +29,13 @@ module Rails
   autoload :WelcomeController
 
   class << self
-    attr_accessor :application, :cache, :logger
+    @application = @app_class = nil
+
+    attr_writer :application
+    attr_accessor :app_class, :cache, :logger
+    def application
+      @application ||= (app_class.instance if app_class)
+    end
 
     delegate :initialize!, :initialized?, to: :application
 
diff --git a/railties/lib/rails/app_rails_loader.rb b/railties/lib/rails/app_rails_loader.rb
index 56f05b3844..39d8007333 100644
--- a/railties/lib/rails/app_rails_loader.rb
+++ b/railties/lib/rails/app_rails_loader.rb
@@ -2,6 +2,8 @@ require 'pathname'
 
 module Rails
   module AppRailsLoader
+    extend self
+
     RUBY = Gem.ruby
     EXECUTABLES = ['bin/rails', 'script/rails']
     BUNDLER_WARNING = <<EOS
@@ -26,7 +28,7 @@ generate it and add it to source control:
 
 EOS
 
-    def self.exec_app_rails
+    def exec_app_rails
       original_cwd = Dir.pwd
 
       loop do
@@ -54,7 +56,7 @@ EOS
       end
     end
 
-    def self.find_executable
+    def find_executable
       EXECUTABLES.find { |exe| File.file?(exe) }
     end
   end
diff --git a/railties/lib/rails/application.rb b/railties/lib/rails/application.rb
index 362713eb75..61639be7c6 100644
--- a/railties/lib/rails/application.rb
+++ b/railties/lib/rails/application.rb
@@ -87,7 +87,15 @@ module Rails
     class << self
       def inherited(base)
         super
-        base.instance
+        Rails.app_class = base
+      end
+
+      def instance
+        super.run_load_hooks!
+      end
+
+      def create(initial_variable_values = {}, &block)
+        new(initial_variable_values, &block).run_load_hooks!
       end
 
       # Makes the +new+ method public.
@@ -116,24 +124,33 @@ module Rails
       @ordered_railties  = nil
       @railties          = nil
       @message_verifiers = {}
+      @ran_load_hooks    = false
 
-      Rails.application ||= self
+      # are these actually used?
+      @initial_variable_values = initial_variable_values
+      @block = block
 
       add_lib_to_load_path!
+    end
+
+    # Returns true if the application is initialized.
+    def initialized?
+      @initialized
+    end
+
+    def run_load_hooks! # :nodoc:
+      return self if @ran_load_hooks
+      @ran_load_hooks = true
       ActiveSupport.run_load_hooks(:before_configuration, self)
 
-      initial_variable_values.each do |variable_name, value|
+      @initial_variable_values.each do |variable_name, value|
         if INITIAL_VARIABLES.include?(variable_name)
           instance_variable_set("@#{variable_name}", value)
         end
       end
 
-      instance_eval(&block) if block_given?
-    end
-
-    # Returns true if the application is initialized.
-    def initialized?
-      @initialized
+      instance_eval(&@block) if @block
+      self
     end
 
     # Implements call according to the Rack API. It simply
@@ -187,6 +204,38 @@ module Rails
       end
     end
 
+    # Convenience for loading config/foo.yml for the current Rails env.
+    #
+    # Example:
+    #
+    #     # config/exception_notification.yml:
+    #     production:
+    #       url: http://127.0.0.1:8080
+    #       namespace: my_app_production
+    #     development:
+    #       url: http://localhost:3001
+    #       namespace: my_app_development
+    #
+    #     # config/production.rb
+    #     MyApp::Application.configure do
+    #       config.middleware.use ExceptionNotifier, config_for(:exception_notification)
+    #     end
+    def config_for(name)
+      yaml = Pathname.new("#{paths["config"].existent.first}/#{name}.yml")
+
+      if yaml.exist?
+        require "yaml"
+        require "erb"
+        (YAML.load(ERB.new(yaml.read).result) || {})[Rails.env] || {}
+      else
+        raise "Could not load configuration. No such file - #{yaml}"
+      end
+    rescue Psych::SyntaxError => e
+      raise "YAML syntax error occurred while parsing #{yaml}. " \
+        "Please note that YAML must be consistently indented using spaces. Tabs are not allowed. " \
+        "Error: #{e.message}"
+    end
+
     # Stores some of the Rails initial environment parameters which
     # will be used by middlewares and engines to configure themselves.
     def env_config
diff --git a/railties/lib/rails/application/configuration.rb b/railties/lib/rails/application/configuration.rb
index 5e8f4de847..782bc4b0f1 100644
--- a/railties/lib/rails/application/configuration.rb
+++ b/railties/lib/rails/application/configuration.rb
@@ -13,7 +13,7 @@ module Rails
                     :railties_order, :relative_url_root, :secret_key_base, :secret_token,
                     :serve_static_assets, :ssl_options, :static_cache_control, :session_options,
                     :time_zone, :reload_classes_only_on_change,
-                    :beginning_of_week, :filter_redirect
+                    :beginning_of_week, :filter_redirect, :x
 
       attr_writer :log_level
       attr_reader :encoding
@@ -48,6 +48,7 @@ module Rails
         @eager_load                    = nil
         @secret_token                  = nil
         @secret_key_base               = nil
+        @x                             = Custom.new
 
         @assets = ActiveSupport::OrderedOptions.new
         @assets.enabled                  = true
@@ -154,6 +155,17 @@ module Rails
       def annotations
         SourceAnnotationExtractor::Annotation
       end
+      
+      private
+        class Custom
+          def initialize
+            @configurations = Hash.new
+          end
+    
+          def method_missing(method, *args)
+            @configurations[method] ||= ActiveSupport::OrderedOptions.new
+          end
+        end
     end
   end
 end
diff --git a/railties/lib/rails/commands/server.rb b/railties/lib/rails/commands/server.rb
index 6146b6c1db..c3b7bb6f84 100644
--- a/railties/lib/rails/commands/server.rb
+++ b/railties/lib/rails/commands/server.rb
@@ -9,7 +9,17 @@ module Rails
       def parse!(args)
         args, options = args.dup, {}
 
-        opt_parser = OptionParser.new do |opts|
+        option_parser(options).parse! args
+
+        options[:log_stdout] = options[:daemonize].blank? && (options[:environment] || Rails.env) == "development"
+        options[:server]     = args.shift
+        options
+      end
+
+      private
+
+      def option_parser(options)
+        OptionParser.new do |opts|
           opts.banner = "Usage: rails server [mongrel, thin, etc] [options]"
           opts.on("-p", "--port=port", Integer,
                   "Runs Rails on the specified port.", "Default: 3000") { |v| options[:Port] = v }
@@ -37,12 +47,6 @@ module Rails
 
           opts.on("-h", "--help", "Show this help message.") { puts opts; exit }
         end
-
-        opt_parser.parse! args
-
-        options[:log_stdout] = options[:daemonize].blank? && (options[:environment] || Rails.env) == "development"
-        options[:server]     = args.shift
-        options
       end
     end
 
diff --git a/railties/lib/rails/engine.rb b/railties/lib/rails/engine.rb
index b36ab3d0d5..dc3da1eb41 100644
--- a/railties/lib/rails/engine.rb
+++ b/railties/lib/rails/engine.rb
@@ -395,7 +395,7 @@ module Rails
             end
 
             unless mod.respond_to?(:railtie_routes_url_helpers)
-              define_method(:railtie_routes_url_helpers) { railtie.routes.url_helpers }
+              define_method(:railtie_routes_url_helpers) {|include_path_helpers = true| railtie.routes.url_helpers(include_path_helpers) }
             end
           end
         end
@@ -509,7 +509,7 @@ module Rails
     def call(env)
       env.merge!(env_config)
       if env['SCRIPT_NAME']
-        env.merge! "ROUTES_#{routes.object_id}_SCRIPT_NAME" => env['SCRIPT_NAME'].dup
+        env["ROUTES_#{routes.object_id}_SCRIPT_NAME"] = env['SCRIPT_NAME'].dup
       end
       app.call(env)
     end
diff --git a/railties/lib/rails/generators/actions.rb b/railties/lib/rails/generators/actions.rb
index a239874df0..4709914947 100644
--- a/railties/lib/rails/generators/actions.rb
+++ b/railties/lib/rails/generators/actions.rb
@@ -7,6 +7,7 @@ module Rails
       def initialize(*) # :nodoc:
         super
         @in_group = nil
+        @after_bundle_callbacks = []
       end
 
       # Adds an entry into +Gemfile+ for the supplied gem.
@@ -232,6 +233,16 @@ module Rails
         log File.read(find_in_source_paths(path))
       end
 
+      # Registers a callback to be executed after bundle and spring binstubs
+      # have run.
+      #
+      #   after_bundle do
+      #     git add: '.'
+      #   end
+      def after_bundle(&block)
+        @after_bundle_callbacks << block
+      end
+
       protected
 
         # Define log for backwards compatibility. If just one argument is sent,
diff --git a/railties/lib/rails/generators/actions/create_migration.rb b/railties/lib/rails/generators/actions/create_migration.rb
index cf3b7acfff..682092fdf2 100644
--- a/railties/lib/rails/generators/actions/create_migration.rb
+++ b/railties/lib/rails/generators/actions/create_migration.rb
@@ -55,7 +55,8 @@ module Rails
           else
             say_status :conflict, :red
             raise Error, "Another migration is already named #{migration_file_name}: " +
-                         "#{existing_migration}. Use --force to replace this migration file."
+              "#{existing_migration}. Use --force to replace this migration " +
+              "or --skip to ignore conflicted file."
           end
         end
 
diff --git a/railties/lib/rails/generators/app_base.rb b/railties/lib/rails/generators/app_base.rb
index 20e512a7ff..caaaae09e6 100644
--- a/railties/lib/rails/generators/app_base.rb
+++ b/railties/lib/rails/generators/app_base.rb
@@ -113,7 +113,7 @@ module Rails
          javascript_gemfile_entry,
          jbuilder_gemfile_entry,
          sdoc_gemfile_entry,
-         spring_gemfile_entry,
+         psych_gemfile_entry,
          @extra_entries].flatten.find_all(&@gem_filter)
       end
 
@@ -194,21 +194,19 @@ module Rails
         def self.path(name, path, comment = nil)
           new(name, nil, comment, path: path)
         end
-
-        def padding(max_width)
-          ' ' * (max_width - name.length + 2)
-        end
       end
 
       def rails_gemfile_entry
         if options.dev?
           [GemfileEntry.path('rails', Rails::Generators::RAILS_DEV_PATH),
            GemfileEntry.github('arel', 'rails/arel'),
-           GemfileEntry.github('rack', 'rack/rack')]
+           GemfileEntry.github('rack', 'rack/rack'),
+           GemfileEntry.github('i18n', 'svenfuchs/i18n')]
         elsif options.edge?
           [GemfileEntry.github('rails', 'rails/rails'),
            GemfileEntry.github('arel', 'rails/arel'),
-           GemfileEntry.github('rack', 'rack/rack')]
+           GemfileEntry.github('rack', 'rack/rack'),
+           GemfileEntry.github('i18n', 'svenfuchs/i18n')]
         else
           [GemfileEntry.version('rails',
                             Rails::VERSION::STRING,
@@ -307,10 +305,12 @@ module Rails
         end
       end
 
-      def spring_gemfile_entry
-        return [] unless spring_install?
-        comment = 'Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring'
-        GemfileEntry.new('spring', nil, comment, group: :development)
+      def psych_gemfile_entry
+        return [] unless defined?(Rubinius)
+
+        comment = 'Use Psych as the YAML engine, instead of Syck, so serialized ' \
+                  'data can be read safely from different rubies (see http://git.io/uuLVag)'
+        GemfileEntry.new('psych', '~> 2.0', comment, platforms: :rbx)
       end
 
       def bundle_command(command)
diff --git a/railties/lib/rails/generators/erb/scaffold/templates/_form.html.erb b/railties/lib/rails/generators/erb/scaffold/templates/_form.html.erb
index da99e74435..bba9141fb8 100644
--- a/railties/lib/rails/generators/erb/scaffold/templates/_form.html.erb
+++ b/railties/lib/rails/generators/erb/scaffold/templates/_form.html.erb
@@ -17,7 +17,7 @@
     <%%= f.label :password %><br>
     <%%= f.password_field :password %>
   </div>
-  <div>
+  <div class="field">
     <%%= f.label :password_confirmation %><br>
     <%%= f.password_field :password_confirmation %>
 <% else -%>
diff --git a/railties/lib/rails/generators/rails/app/app_generator.rb b/railties/lib/rails/generators/rails/app/app_generator.rb
index 188e62b6c8..9110c129d1 100644
--- a/railties/lib/rails/generators/rails/app/app_generator.rb
+++ b/railties/lib/rails/generators/rails/app/app_generator.rb
@@ -259,6 +259,12 @@ module Rails
       public_task :apply_rails_template, :run_bundle
       public_task :generate_spring_binstubs
 
+      def run_after_bundle_callbacks
+        @after_bundle_callbacks.each do |callback|
+          callback.call
+        end
+      end
+
     protected
 
       def self.banner
diff --git a/railties/lib/rails/generators/rails/app/templates/Gemfile b/railties/lib/rails/generators/rails/app/templates/Gemfile
index 5bdbd58097..8b51fda359 100644
--- a/railties/lib/rails/generators/rails/app/templates/Gemfile
+++ b/railties/lib/rails/generators/rails/app/templates/Gemfile
@@ -1,6 +1,5 @@
 source 'https://rubygems.org'
 
-<% max_width = gemfile_entries.map { |g| g.name.length }.max -%>
 <% gemfile_entries.each do |gem| -%>
 <% if gem.comment -%>
 
@@ -8,7 +7,7 @@ source 'https://rubygems.org'
 <% end -%>
 <%= gem.commented_out ? '# ' : '' %>gem '<%= gem.name %>'<%= %(, '#{gem.version}') if gem.version -%>
 <% if gem.options.any? -%>
-,<%= gem.padding(max_width) %><%= gem.options.map { |k,v|
+, <%= gem.options.map { |k,v|
   "#{k}: #{v.inspect}" }.join(', ') %>
 <% end -%>
 <% end -%>
@@ -22,14 +21,23 @@ source 'https://rubygems.org'
 # Use Capistrano for deployment
 # gem 'capistrano-rails', group: :development
 
+group :development, :test do
 <% unless defined?(JRUBY_VERSION) -%>
-# To use a debugger
+  # Call 'debugger' anywhere in the code to stop execution and get a debugger console
   <%- if RUBY_VERSION < '2.0.0' -%>
-# gem 'debugger', group: [:development, :test]
+  gem 'debugger'
   <%- else -%>
-# gem 'byebug', group: [:development, :test]
+  gem 'byebug'
   <%- end -%>
+
+  # Access an IRB console on exceptions page and /console in development
+  gem 'web-console'
+<%- if spring_install? %>
+  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
+  gem 'spring'
+<% end -%>
 <% end -%>
+end
 
 <% if RUBY_PLATFORM.match(/bccwin|cygwin|emx|mingw|mswin|wince/) -%>
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
diff --git a/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
index bbb409616d..35e3035a0b 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
@@ -30,7 +30,8 @@ Rails.application.configure do
   # number of complex assets.
   config.assets.debug = true
 
-  # Generate digests for assets URLs.
+  # Asset digests allow you to set far-future HTTP expiration dates on all assets, 
+  # yet still be able to expire them through the digest params.
   config.assets.digest = true
 
   # Adds additional error checking when serving assets at runtime.
diff --git a/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt
index 5e52f97249..277fe01e89 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/environments/production.rb.tt
@@ -30,7 +30,8 @@ Rails.application.configure do
   # Do not fallback to assets pipeline if a precompiled asset is missed.
   config.assets.compile = false
 
-  # Generate digests for assets URLs.
+  # Asset digests allow you to set far-future HTTP expiration dates on all assets, 
+  # yet still be able to expire them through the digest params.
   config.assets.digest = true
 
   # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb
@@ -43,8 +44,8 @@ Rails.application.configure do
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
   # config.force_ssl = true
 
-  # Set to :debug to see everything in the log.
-  config.log_level = :info
+  # Set to :info to decrease the log volume.
+  config.log_level = :debug
 
   # Prepend all log lines with the following tags.
   # config.log_tags = [ :subdomain, :uuid ]
diff --git a/railties/lib/rails/generators/rails/app/templates/config/initializers/assets.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/initializers/assets.rb.tt
index d2f4ec33a6..01ef3e6630 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/initializers/assets.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/initializers/assets.rb.tt
@@ -3,6 +3,9 @@
 # Version of your assets, change this if you want to expire all your assets.
 Rails.application.config.assets.version = '1.0'
 
+# Add additional assets to the asset load path
+# Rails.application.config.assets.paths << Emoji.images_path
+
 # Precompile additional assets.
 # application.js, application.css, and all non-JS/CSS in app/assets folder are already added.
 # Rails.application.config.assets.precompile += %w( search.js )
diff --git a/railties/lib/rails/generators/rails/controller/USAGE b/railties/lib/rails/generators/rails/controller/USAGE
index de33900e0a..64239ad599 100644
--- a/railties/lib/rails/generators/rails/controller/USAGE
+++ b/railties/lib/rails/generators/rails/controller/USAGE
@@ -16,4 +16,3 @@ Example:
         Test:       test/controllers/credit_cards_controller_test.rb
         Views:      app/views/credit_cards/debit.html.erb [...]
         Helper:     app/helpers/credit_cards_helper.rb
-        Test:       test/helpers/credit_cards_helper_test.rb
diff --git a/railties/lib/rails/generators/rails/helper/USAGE b/railties/lib/rails/generators/rails/helper/USAGE
index 30e323a858..8855ef3b01 100644
--- a/railties/lib/rails/generators/rails/helper/USAGE
+++ b/railties/lib/rails/generators/rails/helper/USAGE
@@ -5,13 +5,9 @@ Description:
     To create a helper within a module, specify the helper name as a
     path like 'parent_module/helper_name'.
 
-    This generates a helper class in app/helpers and invokes the configured
-    test framework.
-
 Example:
     `rails generate helper CreditCard`
 
     Credit card helper.
         Helper:     app/helpers/credit_card_helper.rb
-        Test:       test/helpers/credit_card_helper_test.rb
 
diff --git a/railties/lib/rails/generators/rails/model/USAGE b/railties/lib/rails/generators/rails/model/USAGE
index 833b7beb7f..2a6b8700e3 100644
--- a/railties/lib/rails/generators/rails/model/USAGE
+++ b/railties/lib/rails/generators/rails/model/USAGE
@@ -6,6 +6,11 @@ Description:
     model's attributes. Timestamps are added by default, so you don't have to
     specify them by hand as 'created_at:datetime updated_at:datetime'.
 
+    As a special case, specifying 'password:digest' will generate a
+    password_digest field of string type, and configure your generated model and
+    tests for use with ActiveModel has_secure_password (assuming the default ORM
+    and test framework are being used).
+
     You don't have to think up every attribute up front, but it helps to
     sketch out a few so you can start working with the model immediately.
 
@@ -27,7 +32,8 @@ Available field types:
         `rails generate model post title:string body:text`
 
     will generate a title column with a varchar type and a body column with a text
-    type. You can use the following types:
+    type. If no type is specified the string type will be used by default.
+    You can use the following types:
 
         integer
         primary_key
@@ -73,6 +79,10 @@ Available field types:
         `rails generate model user username:string{30}:uniq`
         `rails generate model product supplier:references{polymorphic}:index`
 
+    If you require a `password_digest` string column for use with
+    has_secure_password, you should specify `password:digest`:
+
+        `rails generate model user password:digest`
 
 Examples:
     `rails generate model account`
diff --git a/railties/lib/rails/generators/rails/plugin/templates/Gemfile b/railties/lib/rails/generators/rails/plugin/templates/Gemfile
index 796587f316..35ad9fbf9e 100644
--- a/railties/lib/rails/generators/rails/plugin/templates/Gemfile
+++ b/railties/lib/rails/generators/rails/plugin/templates/Gemfile
@@ -31,7 +31,7 @@ end
 <% end -%>
 <%= gem.commented_out ? '# ' : '' %>gem '<%= gem.name %>'<%= %(, '#{gem.version}') if gem.version -%>
 <% if gem.options.any? -%>
-,<%= gem.padding(max_width) %><%= gem.options.map { |k,v|
+, <%= gem.options.map { |k,v|
   "#{k}: #{v.inspect}" }.join(', ') %>
 <% end -%>
 <% end -%>
diff --git a/railties/lib/rails/generators/rails/scaffold/USAGE b/railties/lib/rails/generators/rails/scaffold/USAGE
index 4a3eb2c7c7..1b2a944103 100644
--- a/railties/lib/rails/generators/rails/scaffold/USAGE
+++ b/railties/lib/rails/generators/rails/scaffold/USAGE
@@ -9,11 +9,16 @@ Description:
 
     Attributes are field arguments specifying the model's attributes. You can
     optionally pass the type and an index to each field. For instance:
-    "title body:text tracking_id:integer:uniq" will generate a title field of
+    'title body:text tracking_id:integer:uniq' will generate a title field of
     string type, a body with text type and a tracking_id as an integer with an
     unique index. "index" could also be given instead of "uniq" if one desires
     a non unique index.
 
+    As a special case, specifying 'password:digest' will generate a
+    password_digest field of string type, and configure your generated model,
+    controller, views, and test suite for use with ActiveModel
+    has_secure_password (assuming they are using Rails defaults).
+
     Timestamps are added by default, so you don't have to specify them by hand
     as 'created_at:datetime updated_at:datetime'.
 
@@ -33,3 +38,4 @@ Examples:
     `rails generate scaffold post`
     `rails generate scaffold post title body:text published:boolean`
     `rails generate scaffold purchase amount:decimal tracking_id:integer:uniq`
+    `rails generate scaffold user email:uniq password:digest`
diff --git a/railties/lib/rails/generators/test_unit/helper/helper_generator.rb b/railties/lib/rails/generators/test_unit/helper/helper_generator.rb
index 0db76f9eaf..bde4e88915 100644
--- a/railties/lib/rails/generators/test_unit/helper/helper_generator.rb
+++ b/railties/lib/rails/generators/test_unit/helper/helper_generator.rb
@@ -3,11 +3,7 @@ require 'rails/generators/test_unit'
 module TestUnit # :nodoc:
   module Generators # :nodoc:
     class HelperGenerator < Base # :nodoc:
-      check_class_collision suffix: "HelperTest"
-
-      def create_helper_files
-        template 'helper_test.rb', File.join('test/helpers', class_path, "#{file_name}_helper_test.rb")
-      end
+      # Rails does not generate anything here.
     end
   end
 end
diff --git a/railties/lib/rails/generators/test_unit/helper/templates/helper_test.rb b/railties/lib/rails/generators/test_unit/helper/templates/helper_test.rb
deleted file mode 100644
index 7d37bda0f9..0000000000
--- a/railties/lib/rails/generators/test_unit/helper/templates/helper_test.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-require 'test_helper'
-
-<% module_namespacing do -%>
-class <%= class_name %>HelperTest < ActionView::TestCase
-end
-<% end -%>
diff --git a/railties/lib/rails/generators/testing/behaviour.rb b/railties/lib/rails/generators/testing/behaviour.rb
index 7576eba6e0..e0600d0b59 100644
--- a/railties/lib/rails/generators/testing/behaviour.rb
+++ b/railties/lib/rails/generators/testing/behaviour.rb
@@ -100,6 +100,23 @@ module Rails
             dirname, file_name = File.dirname(absolute), File.basename(absolute).sub(/\.rb$/, '')
             Dir.glob("#{dirname}/[0-9]*_*.rb").grep(/\d+_#{file_name}.rb$/).first
           end
+
+          def capture(stream)
+            stream = stream.to_s
+            captured_stream = Tempfile.new(stream)
+            stream_io = eval("$#{stream}")
+            origin_stream = stream_io.dup
+            stream_io.reopen(captured_stream)
+
+            yield
+
+            stream_io.rewind
+            return captured_stream.read
+          ensure
+            captured_stream.close
+            captured_stream.unlink
+            stream_io.reopen(origin_stream)
+          end
       end
     end
   end
diff --git a/railties/lib/rails/rack/logger.rb b/railties/lib/rails/rack/logger.rb
index 3b35798679..9962e6d943 100644
--- a/railties/lib/rails/rack/logger.rb
+++ b/railties/lib/rails/rack/logger.rb
@@ -34,7 +34,7 @@ module Rails
 
         instrumenter = ActiveSupport::Notifications.instrumenter
         instrumenter.start 'request.action_dispatch', request: request
-        logger.info started_request_message(request)
+        logger.info { started_request_message(request) }
         resp = @app.call(env)
         resp[2] = ::Rack::BodyProxy.new(resp[2]) { finish(request) }
         resp