Create a deprecation behavior that triggers a notification for deprecation notices, and make the behaviors independent of the environment names.

* In Rails 2.3 apps being upgraded, you will need to add the deprecation
  configuration to each of your environments. Failing to do so will
  result in the same behavior as Rails 2.3, but with an outputted warning
  to provide information on how to set up the setting.
* New Rails 3 applications generate the setting
* The notification style will send deprecation notices using
  ActiveSupport::Notifications. Third-party tools can listen in to
  these notifications to provide a streamlined view of the
  deprecation notices occurring in your app.
* The payload in the notification is the deprecation warning itself
  as well as the callstack from the point that triggered the
  notification.

5 files changed, 12 insertions, 1 deletions

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 f0e917dd96..99758dfcf7 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
@@ -16,4 +16,7 @@
 
   # Don't care if the mailer can't send
   config.action_mailer.raise_delivery_errors = false
+
+  # Print deprecation notices to the Rails logger
+  config.active_support.deprecation = :log
 end
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 b9fb13b640..93407fa058 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
@@ -43,4 +43,7 @@
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
   # the I18n.default_locale when a translation can not be found)
   config.i18n.fallbacks = true
+
+  # Send deprecation notices to registered listeners
+  config.active_support.deprecation = :notification
 end
diff --git a/railties/lib/rails/generators/rails/app/templates/config/environments/test.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/environments/test.rb.tt
index beb28e2229..26cdef071a 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/environments/test.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/environments/test.rb.tt
@@ -29,4 +29,7 @@
   # This is necessary if your schema can't be completely dumped by the schema dumper,
   # like if you have constraints or database-specific column types
   # config.active_record.schema_format = :sql
+
+  # Print deprecation notices to the stderr
+  config.active_support.deprecation = :stderr
 end
diff --git a/railties/test/application/url_generation_test.rb b/railties/test/application/url_generation_test.rb
index 72cae23985..2b6ec26cd0 100644
--- a/railties/test/application/url_generation_test.rb
+++ b/railties/test/application/url_generation_test.rb
@@ -16,6 +16,7 @@ module ApplicationTests
       class MyApp < Rails::Application
         config.secret_token = "3b7cd727ee24e8444053437c36cc66c4"
         config.session_store :cookie_store, :key => "_myapp_session"
+        config.active_support.deprecation = :log
       end
 
       MyApp.initialize!
diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index b46ac0efaf..390c0ab543 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -100,7 +100,7 @@ module TestHelpers
         end
       end
 
-      add_to_config 'config.secret_token = "3b7cd727ee24e8444053437c36cc66c4"; config.session_store :cookie_store, :key => "_myapp_session"'
+      add_to_config 'config.secret_token = "3b7cd727ee24e8444053437c36cc66c4"; config.session_store :cookie_store, :key => "_myapp_session"; config.active_support.deprecation = :log'
     end
 
     def make_basic_app
@@ -110,6 +110,7 @@ module TestHelpers
       app = Class.new(Rails::Application)
       app.config.secret_token = "3b7cd727ee24e8444053437c36cc66c4"
       app.config.session_store :cookie_store, :key => "_myapp_session"
+      app.config.active_support.deprecation = :log
 
       yield app if block_given?
       app.initialize!