Collapse all new default initializers into a single file

- Adjusted tests also for this new behavior.
- Based on the discussion in
  https://github.com/rails/rails/pull/25184#issuecomment-222454583.

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -90,41 +90,26 @@ def config
 
     def config_when_updating
       cookie_serializer_config_exist = File.exist?('config/initializers/cookies_serializer.rb')
-      callback_terminator_config_exist = File.exist?('config/initializers/new_framework_defaults/callback_terminator.rb')
-      active_record_belongs_to_required_by_default_config_exist = File.exist?('config/initializers/new_framework_defaults/active_record_belongs_to_required_by_default.rb')
-      to_time_preserves_timezone_config_exist = File.exist?('config/initializers/new_framework_defaults/to_time_preserves_timezone.rb')
+      new_framework_defaults_config_exist = File.exist?('config/initializers/new_framework_defaults.rb')
       action_cable_config_exist = File.exist?('config/cable.yml')
-      ssl_options_exist = File.exist?('config/initializers/new_framework_defaults/ssl_options.rb')
       rack_cors_config_exist = File.exist?('config/initializers/cors.rb')
 
       config
 
       gsub_file 'config/environments/development.rb', /^(\s+)config\.file_watcher/, '\1# config.file_watcher'
 
-      unless callback_terminator_config_exist
-        remove_file 'config/initializers/new_framework_defaults/callback_terminator.rb'
-      end
-
       unless cookie_serializer_config_exist
         gsub_file 'config/initializers/cookies_serializer.rb', /json(?!,)/, 'marshal'
       end
 
-      unless active_record_belongs_to_required_by_default_config_exist
-        remove_file 'config/initializers/new_framework_defaults/active_record_belongs_to_required_by_default.rb'
-      end
-
-      unless to_time_preserves_timezone_config_exist
-        remove_file 'config/initializers/new_framework_defaults/to_time_preserves_timezone.rb'
+      unless new_framework_defaults_config_exist
+        remove_file 'config/initializers/new_framework_defaults.rb'
       end
 
       unless action_cable_config_exist
         template 'config/cable.yml'
       end
 
-      unless ssl_options_exist
-        remove_file 'config/initializers/new_framework_defaults/ssl_options.rb'
-      end
-
       unless rack_cors_config_exist
         remove_file 'config/initializers/cors.rb'
       end
@@ -342,12 +327,6 @@ def delete_action_mailer_files_skipping_action_mailer
         end
       end
 
-      def delete_active_record_initializers_skipping_active_record
-        if options[:skip_active_record]
-          remove_file 'config/initializers/new_framework_defaults/active_record_belongs_to_required_by_default.rb'
-        end
-      end
-
       def delete_action_cable_files_skipping_action_cable
         if options[:skip_action_cable]
           remove_file 'config/cable.yml'
@@ -360,8 +339,6 @@ def delete_non_api_initializers_if_api_option
         if options[:api]
           remove_file 'config/initializers/session_store.rb'
           remove_file 'config/initializers/cookies_serializer.rb'
-          remove_file 'config/initializers/new_framework_defaults/request_forgery_protection.rb'
-          remove_file 'config/initializers/new_framework_defaults/per_form_csrf_tokens.rb'
         end
       end
 

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults.rb.tt

+# Be sure to restart your server when you modify this file.
+# This file contains all the new default configuration options from
+# Rails 5.0.
+<%- unless options[:skip_active_record] -%>
+
+# Require `belongs_to` associations by default. This is a new Rails 5.0
+# default, so it is introduced as a configuration option to ensure that apps
+# made on earlier versions of Rails are not affected when upgrading.
+Rails.application.config.active_record.belongs_to_required_by_default = true
+<%- end -%>
+
+# Do not halt callback chains when a callback returns false. This is a new
+# Rails 5.0 default, so it is introduced as a configuration option to ensure
+# that apps made with earlier versions of Rails are not affected when upgrading.
+ActiveSupport.halt_callback_chains_on_return_false = false
+<%- unless options[:api] -%>
+
+# Enable per-form CSRF tokens.
+Rails.application.config.action_controller.per_form_csrf_tokens = true
+
+# Enable origin-checking CSRF mitigation.
+Rails.application.config.action_controller.forgery_protection_origin_check = true
+<%- end -%>
+
+# Configure SSL options to enable HSTS with subdomains. This is a new
+# Rails 5.0 default, so it is introduced as a configuration option to ensure
+# that apps made on earlier versions of Rails are not affected when upgrading.
+Rails.application.config.ssl_options = { hsts: { subdomains: true } }
+
+# Preserve the timezone of the receiver when calling to `to_time`.
+# Ruby 2.4 will change the behavior of `to_time` to preserve the timezone
+# when converting to an instance of `Time` instead of the previous behavior
+# of converting to the local system timezone.
+#
+# Rails 5.0 introduced this config option so that apps made with earlier
+# versions of Rails are not affected when upgrading.
+ActiveSupport.to_time_preserves_timezone = true

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults/active_record_belongs_to_required_by_default.rb

-# Be sure to restart your server when you modify this file.
-
-# Require `belongs_to` associations by default. This is a new Rails 5.0
-# default, so it is introduced as a configuration option to ensure that apps
-# made on earlier versions of Rails are not affected when upgrading.
-Rails.application.config.active_record.belongs_to_required_by_default = true

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults/callback_terminator.rb

-# Be sure to restart your server when you modify this file.
-
-# Do not halt callback chains when a callback returns false. This is a new
-# Rails 5.0 default, so it is introduced as a configuration option to ensure
-# that apps made with earlier versions of Rails are not affected when upgrading.
-ActiveSupport.halt_callback_chains_on_return_false = false

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults/per_form_csrf_tokens.rb

-# Be sure to restart your server when you modify this file.
-
-# Enable per-form CSRF tokens.
-Rails.application.config.action_controller.per_form_csrf_tokens = true

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults/request_forgery_protection.rb

-# Be sure to restart your server when you modify this file.
-
-# Enable origin-checking CSRF mitigation.
-Rails.application.config.action_controller.forgery_protection_origin_check = true

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults/ssl_options.rb

-# Be sure to restart your server when you modify this file.
-
-# Configure SSL options to enable HSTS with subdomains. This is a new
-# Rails 5.0 default, so it is introduced as a configuration option to ensure
-# that apps made on earlier versions of Rails are not affected when upgrading.
-Rails.application.config.ssl_options = { hsts: { subdomains: true } }

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults/to_time_preserves_timezone.rb

-# Be sure to restart your server when you modify this file.
-
-# Preserve the timezone of the receiver when calling to `to_time`.
-# Ruby 2.4 will change the behavior of `to_time` to preserve the timezone
-# when converting to an instance of `Time` instead of the previous behavior
-# of converting to the local system timezone.
-#
-# Rails 5.0 introduced this config option so that apps made with earlier
-# versions of Rails are not affected when upgrading.
-ActiveSupport.to_time_preserves_timezone = true

railties/test/generators/api_app_generator_test.rb

@@ -62,6 +62,15 @@ def test_generator_if_skip_action_cable_is_given
     end
   end
 
+  def test_generator_skips_per_form_csrf_token_and_origin_check_configs_for_api_apps
+    run_generator
+
+    assert_file "config/initializers/new_framework_defaults.rb" do |initializer_content|
+      assert_no_match(/per_form_csrf_tokens/, initializer_content)
+      assert_no_match(/forgery_protection_origin_check/, initializer_content)
+    end
+  end
+
   private
 
   def default_files
@@ -100,8 +109,6 @@ def skipped_files
        config/initializers/assets.rb
        config/initializers/cookies_serializer.rb
        config/initializers/session_store.rb
-       config/initializers/new_framework_defaults/request_forgery_protection.rb
-       config/initializers/new_framework_defaults/per_form_csrf_tokens.rb
        lib/assets
        vendor/assets
        test/helpers

railties/test/generators/app_generator_test.rb

@@ -172,34 +172,6 @@ def test_rails_update_keep_the_cookie_serializer_if_it_is_already_configured
     end
   end
 
-  def test_rails_update_does_not_create_callback_terminator_initializer
-    app_root = File.join(destination_root, 'myapp')
-    run_generator [app_root]
-
-    FileUtils.rm("#{app_root}/config/initializers/new_framework_defaults/callback_terminator.rb")
-
-    stub_rails_application(app_root) do
-      generator = Rails::Generators::AppGenerator.new ["rails"], [], destination_root: app_root, shell: @shell
-      generator.send(:app_const)
-      quietly { generator.send(:update_config_files) }
-      assert_no_file "#{app_root}/config/initializers/new_framework_defaults/callback_terminator.rb"
-    end
-  end
-
-  def test_rails_update_does_not_remove_callback_terminator_initializer_if_already_present
-    app_root = File.join(destination_root, 'myapp')
-    run_generator [app_root]
-
-    FileUtils.touch("#{app_root}/config/initializers/new_framework_defaults/callback_terminator.rb")
-
-    stub_rails_application(app_root) do
-      generator = Rails::Generators::AppGenerator.new ["rails"], [], destination_root: app_root, shell: @shell
-      generator.send(:app_const)
-      quietly { generator.send(:update_config_files) }
-      assert_file "#{app_root}/config/initializers/new_framework_defaults/callback_terminator.rb"
-    end
-  end
-
   def test_rails_update_set_the_cookie_serializer_to_marshal_if_it_is_not_already_configured
     app_root = File.join(destination_root, 'myapp')
     run_generator [app_root]
@@ -229,87 +201,31 @@ def test_rails_update_dont_set_file_watcher
     end
   end
 
-  def test_rails_update_does_not_create_active_record_belongs_to_required_by_default
-    app_root = File.join(destination_root, 'myapp')
-    run_generator [app_root]
-
-    FileUtils.rm("#{app_root}/config/initializers/new_framework_defaults/active_record_belongs_to_required_by_default.rb")
-
-    stub_rails_application(app_root) do
-      generator = Rails::Generators::AppGenerator.new ["rails"], [], destination_root: app_root, shell: @shell
-      generator.send(:app_const)
-      quietly { generator.send(:update_config_files) }
-      assert_no_file "#{app_root}/config/initializers/new_framework_defaults/active_record_belongs_to_required_by_default.rb"
-    end
-  end
-
-  def test_rails_update_does_not_remove_active_record_belongs_to_required_by_default_if_already_present
-    app_root = File.join(destination_root, 'myapp')
-    run_generator [app_root]
-
-    FileUtils.touch("#{app_root}/config/initializers/new_framework_defaults/active_record_belongs_to_required_by_default.rb")
-
-    stub_rails_application(app_root) do
-      generator = Rails::Generators::AppGenerator.new ["rails"], [], destination_root: app_root, shell: @shell
-      generator.send(:app_const)
-      quietly { generator.send(:update_config_files) }
-      assert_file "#{app_root}/config/initializers/new_framework_defaults/active_record_belongs_to_required_by_default.rb"
-    end
-  end
-
-  def test_rails_update_does_not_create_to_time_preserves_timezone
-    app_root = File.join(destination_root, 'myapp')
-    run_generator [app_root]
-
-    FileUtils.rm("#{app_root}/config/initializers/new_framework_defaults/to_time_preserves_timezone.rb")
-
-    stub_rails_application(app_root) do
-      generator = Rails::Generators::AppGenerator.new ["rails"], [], destination_root: app_root, shell: @shell
-      generator.send(:app_const)
-      quietly { generator.send(:update_config_files) }
-      assert_no_file "#{app_root}/config/initializers/new_framework_defaults/to_time_preserves_timezone.rb"
-    end
-  end
-
-  def test_rails_update_does_not_remove_to_time_preserves_timezone_if_already_present
+  def test_rails_update_does_not_create_new_framework_defaults_by_default
     app_root = File.join(destination_root, 'myapp')
     run_generator [app_root]
 
-    FileUtils.touch("#{app_root}/config/initializers/new_framework_defaults/to_time_preserves_timezone.rb")
+    FileUtils.rm("#{app_root}/config/initializers/new_framework_defaults.rb")
 
     stub_rails_application(app_root) do
       generator = Rails::Generators::AppGenerator.new ["rails"], [], destination_root: app_root, shell: @shell
       generator.send(:app_const)
       quietly { generator.send(:update_config_files) }
-      assert_file "#{app_root}/config/initializers/new_framework_defaults/to_time_preserves_timezone.rb"
+      assert_no_file "#{app_root}/config/initializers/new_framework_defaults.rb"
     end
   end
 
-  def test_rails_update_does_not_create_ssl_options_by_default
+  def test_rails_update_does_not_new_framework_defaults_if_already_present
     app_root = File.join(destination_root, 'myapp')
     run_generator [app_root]
 
-    FileUtils.rm("#{app_root}/config/initializers/new_framework_defaults/ssl_options.rb")
+    FileUtils.touch("#{app_root}/config/initializers/new_framework_defaults.rb")
 
     stub_rails_application(app_root) do
       generator = Rails::Generators::AppGenerator.new ["rails"], [], destination_root: app_root, shell: @shell
       generator.send(:app_const)
       quietly { generator.send(:update_config_files) }
-      assert_no_file "#{app_root}/config/initializers/new_framework_defaults/ssl_options.rb"
-    end
-  end
-
-  def test_rails_update_does_not_remove_ssl_options_if_already_present
-    app_root = File.join(destination_root, 'myapp')
-    run_generator [app_root]
-
-    FileUtils.touch("#{app_root}/config/initializers/new_framework_defaults/ssl_options.rb")
-
-    stub_rails_application(app_root) do
-      generator = Rails::Generators::AppGenerator.new ["rails"], [], destination_root: app_root, shell: @shell
-      generator.send(:app_const)
-      quietly { generator.send(:update_config_files) }
-      assert_file "#{app_root}/config/initializers/new_framework_defaults/ssl_options.rb"
+      assert_file "#{app_root}/config/initializers/new_framework_defaults.rb"
     end
   end
 
@@ -452,12 +368,15 @@ def test_generator_if_skip_puma_is_given
   def test_generator_if_skip_active_record_is_given
     run_generator [destination_root, "--skip-active-record"]
     assert_no_file "config/database.yml"
-    assert_no_file "config/initializers/new_framework_defaults/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)
     end
+
+    assert_file "config/initializers/new_framework_defaults.rb" do |initializer_content|
+      assert_no_match(/belongs_to_required_by_default/, initializer_content)
+    end
   end
 
   def test_generator_if_skip_action_mailer_is_given