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Config guide: Use bold titles for initializers instead of headings.
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Ryan Bigg
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e4456b6f03
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1 changed files with 58 additions and 153 deletions
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@ -419,219 +419,124 @@ The block's argument of the +initialize+ is the instance of the application itse
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Because +Rails::Application+ inherits from +Rails::Railtie+ (indirectly), you can use the +initializer+ method in +config/application.rb+ to define initializers for the application.
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h4. Initializers
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Below is a comprehensive list of all the initializers found in Rails in the order that they are defined (and therefore run in, unless otherwise stated).
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h4. +load_environment_hook+
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*+load_environment_hook+*
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Serves as a placeholder so that +:load_environment_config+ can be defined to run before it.
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h4. +load_active_support+
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*+load_active_support+* Requires +active_support/dependencies+ which sets up the basis for Active Support. Optionally requires +active_support/all+ if +config.active_support.bare+ is un-truthful, which is the default.
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Requires +active_support/dependencies+ which sets up the basis for Active Support. Optionally requires +active_support/all+ if +config.active_support.bare+ is un-truthful, which is the default.
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*+preload_frameworks+* Will load all autoload dependencies of Rails automatically if +config.preload_frameworks+ is +true+ or "truthful". By default this configuration option is disabled. In Rails, when internal classes are referenced for the first time they are autoloaded. +:preload_frameworks+ loads all of this at once on initialization.
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h4. +preload_frameworks+
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*+initialize_logger+* Initializes the logger (an +ActiveSupport::BufferedLogger+ object) for the application and makes it accessible at +Rails.logger+, providing that there's no initializer inserted before this point that has defined +Rails.logger+.
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Will load all autoload dependencies of Rails automatically if +config.preload_frameworks+ is +true+ or "truthful". By default this configuration option is disabled. In Rails, when internal classes are referenced for the first time they are autoloaded. +:preload_frameworks+ loads all of this at once on initialization.
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*+initialize_cache+* If +RAILS_CACHE+ isn't yet set, initializes the cache by referencing the value in +config.cache_store+ and stores the outcome as +RAILS_CACHE+. If this object responds to the +middleware+ method, its middleware is inserted before +Rack::Runtime+ in the middleware stack.
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h4. +initialize_logger+
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*+set_clear_dependencies_hook+* Provides a hook for +active_record.set_dispatch_hooks+ to use, which will run before this initializer. This initializer -- which runs only if +cache_classes+ is set to +false+ -- uses +ActionDispatch::Callbacks.after+ to remove the constants which have been referenced during the request from the object space so that they will be reloaded during the following request.
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Initializes the logger (an +ActiveSupport::BufferedLogger+ object) for the application and makes it accessible at +Rails.logger+, providing that there's no initializer inserted before this point that has defined +Rails.logger+.
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*+initialize_dependency_mechanism+* If +config.cache_classes+ is set to +true+, configures +ActiveSupport::Dependencies.mechanism+ to +require+ dependencies rather than +load+ them.
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h4. +initialize_cache+
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*+bootstrap_hook+* Runs all configured +before_initialize+ blocks.
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If +RAILS_CACHE+ isn't yet set, initializes the cache by referencing the value in +config.cache_store+ and stores the outcome as +RAILS_CACHE+. If this object responds to the +middleware+ method, its middleware is inserted before +Rack::Runtime+ in the middleware stack.
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*+i18n.callbacks+* In the development environment, sets up a +to_prepare+ callback which will call +I18n.reload!+ if any of the locales have changed since the last request. In production mode this callback will only run on the first request.
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h4. +set_clear_dependencies_hook+
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*+active_support.initialize_whiny_nils+* Will require +active_support/whiny_nil+ if +config.whiny_nil+ is set to +true+. This file will output errors such as:
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Provides a hook for +active_record.set_dispatch_hooks+ to use, which will run before this initializer.
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This initializer -- which runs only if +cache_classes+ is set to +false+ -- uses +ActionDispatch::Callbacks.after+ to remove the constants which have been referenced during the request from the object space so that they will be reloaded during the following request.
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h4. +initialize_dependency_mechanism+
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If +config.cache_classes+ is set to +true+, configures +ActiveSupport::Dependencies.mechanism+ to +require+ dependencies rather than +load+ them.
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h4. +bootstrap_hook+
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Runs all configured +before_initialize+ blocks.
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h4. +i18n.callbacks+
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In the development environment, sets up a +to_prepare+ callback which will call +I18n.reload!+ if any of the locales have changed since the last request. In production mode this callback will only run on the first request.
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h4. +active_support.initialize_whiny_nils+
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Will require +active_support/whiny_nil+ if +config.whiny_nil+ is set to +true+. This file will output errors such as:
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<text>
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<plain>
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Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id
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</text>
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</plain>
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And:
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<text>
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<plain>
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You have a nil object when you didn't expect it!
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You might have expected an instance of Array.
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The error occurred while evaluating nil.each
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</text>
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</plain>
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h4. +active_support.deprecation_behavior+
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*+active_support.deprecation_behavior+* Sets up deprecation reporting for environments, defaulting to +log+ for development, +notify+ for production and +stderr+ for test. If a value isn't set for +config.active_support.deprecation+ then this initializer will prompt the user to configure this line in the current environment's +config/environments+ file.
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Sets up deprecation reporting for environments, defaulting to +log+ for development, +notify+ for production and +stderr+ for test. If a value isn't set for +config.active_support.deprecation+ then this initializer will prompt the user to configure this line in the current environment's +config/environments+ file.
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*+active_support.initialize_time_zone+* Sets the default time zone for the application based off the +config.time_zone+ setting, which defaults to "UTC".
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h4. +active_support.initialize_time_zone+
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*+action_dispatch.configure+* Configures the +ActionDispatch::Http::URL.tld_length+ to be set to the value of +config.action_dispatch.tld_length+.
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Sets the default time zone for the application based off the +config.time_zone+ setting, which defaults to "UTC".
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*+action_view.cache_asset_ids+* Will set +ActionView::Helpers::AssetTagHelper::AssetPaths.cache_asset_ids+ to +false+ when Active Support loads, but only if +config.cache_classes+ is too.
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h4. +action_dispatch.configure+
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*+action_view.javascript_expansions+* Registers the expansions set up by +config.action_view.javascript_expansions+ and +config.action_view.stylesheet_expansions+ to be recognised by Action View and therefore usable in the views.
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Configures the +ActionDispatch::Http::URL.tld_length+ to be set to the value of +config.action_dispatch.tld_length+.
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*+action_view.set_configs+* Sets up Action View by using the settings in +config.action_view+ by +send+'ing the method names as setters to +ActionView::Base+ and passing the values through.
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h4. +action_view.cache_asset_ids+
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*+action_controller.logger+* Sets +ActionController::Base.logger+ -- if it's not already set -- to +Rails.logger+.
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Will set +ActionView::Helpers::AssetTagHelper::AssetPaths.cache_asset_ids+ to +false+ when Active Support loads, but only if +config.cache_classes+ is too.
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*+action_controller.initialize_framework_caches+* Sets +ActionController::Base.cache_store+ -- if it's not already set -- to +RAILS_CACHE+.
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h4. +action_view.javascript_expansions+
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*+action_controller.set_configs+* Sets up Action Controller by using the settings in +config.action_controller+ by +send+'ing the method names as setters to +ActionController::Base+ and passing the values through.
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Registers the expansions set up by +config.action_view.javascript_expansions+ and +config.action_view.stylesheet_expansions+ to be recognised by Action View and therefore usable in the views.
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*+action_controller.compile_config_methods+* Initializes methods for the config settings specified so that they are quicker to access.
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h4. +action_view.set_configs+
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*+active_record.initialize_timezone+* Sets +ActiveRecord::Base.time_zone_aware_attributes+ to true, as well as setting +ActiveRecord::Base.default_timezone+ to UTC. When attributes are read from the database, they will be converted into the time zone specified by +Time.zone+.
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Sets up Action View by using the settings in +config.action_view+ by +send+'ing the method names as setters to +ActionView::Base+ and passing the values through.
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*+active_record.logger+* Sets +ActiveRecord::Base.logger+ -- if it's not already set -- to +Rails.logger+.
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h4. +action_controller.logger+
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*+active_record.set_configs+* Sets up Active Record by using the settings in +config.active_record+ by +send+'ing the method names as setters to +ActiveRecord::Base+ and passing the values through.
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Sets +ActionController::Base.logger+ -- if it's not already set -- to +Rails.logger+.
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*+active_record.initialize_database+* Loads the database configuration (by default) from +config/database.yml+ and establishes a connection for the current environment.
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h4. +action_controller.initialize_framework_caches+
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*+active_record.log_runtime+* Includes +ActiveRecord::Railties::ControllerRuntime+ which is responsible for reporting the length of time Active Record calls took for the request back to the logger.
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Sets +ActionController::Base.cache_store+ -- if it's not already set -- to +RAILS_CACHE+.
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*+active_record.set_dispatch_hooks+* If +config.cache_classes+ is set to false, all reloadable connections to the database will be reset.
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h4. +action_controller.set_configs+
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*+action_mailer.logger+* Sets +ActionMailer::Base.logger+ -- if it's not already set -- to +Rails.logger+.
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Sets up Action Controller by using the settings in +config.action_controller+ by +send+'ing the method names as setters to +ActionController::Base+ and passing the values through.
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*+action_mailer.set_configs+* Sets up Action Mailer by using the settings in +config.action_mailer+ by +send+'ing the method names as setters to +ActionMailer::Base+ and passing the values through.
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h4. +action_controller.compile_config_methods+
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*+action_mailer.compile_config_methods+* Initializes methods for the config settings specified so that they are quicker to access.
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Initializes methods for the config settings specified so that they are quicker to access.
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*+active_resource.set_configs+* Sets up Active Resource by using the settings in +config.active_resource+ by +send+'ing the method names as setters to +ActiveResource::Base+ and passing the values through.
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h4. +active_record.initialize_timezone+
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*+set_load_path+* This initializer runs before +bootstrap_hook+. Adds the +vendor+, +lib+, all directories of +app+ and any paths specified by +config.load_paths+ to +$LOAD_PATH+.
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Sets +ActiveRecord::Base.time_zone_aware_attributes+ to true, as well as setting +ActiveRecord::Base.default_timezone+ to UTC. When attributes are read from the database, they will be converted into the time zone specified by +Time.zone+.
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*+set_autoload_path+* This initializer runs before +bootstrap_hook+. Adds all sub-directories of +app+ and paths specified by +config.autoload_paths+ to +ActiveSupport::Dependencies.autoload_paths+.
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h4. +active_record.logger+
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*+add_routing_paths+* Loads (by default) all +config/routes.rb+ files (in the application and railties, including engines) and sets up the routes for the application.
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Sets +ActiveRecord::Base.logger+ -- if it's not already set -- to +Rails.logger+.
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*+add_locales+* Adds the files in +config/locales+ (from the application, railties and engines) to +I18n.load_path+, making available the translations in these files.
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h4. +active_record.set_configs+
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*+add_view_paths+* Adds the directory +app/views+ from the application, railties and engines to the lookup path for view files for the application.
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Sets up Active Record by using the settings in +config.active_record+ by +send+'ing the method names as setters to +ActiveRecord::Base+ and passing the values through.
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*+load_environment_config+* Loads the +config/environments+ file for the current environment.
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h4. +active_record.initialize_database+
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*+append_asset_paths+* Finds asset paths for the application and all attached railties and keeps a track of the available directories in +config.static_asset_paths+.
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Loads the database configuration (by default) from +config/database.yml+ and establishes a connection for the current environment.
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*+prepend_helpers_path+* Adds the directory +app/helpers+ from the application, railties and engines to the lookup path for helpers for the application.
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h4. +active_record.log_runtime+
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Includes +ActiveRecord::Railties::ControllerRuntime+ which is responsible for reporting the length of time Active Record calls took for the request back to the logger.
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h4. +active_record.set_dispatch_hooks+
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If +config.cache_classes+ is set to false, all reloadable connections to the database will be reset.
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h4. +action_mailer.logger+
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Sets +ActionMailer::Base.logger+ -- if it's not already set -- to +Rails.logger+.
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h4. +action_mailer.set_configs+
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Sets up Action Mailer by using the settings in +config.action_mailer+ by +send+'ing the method names as setters to +ActionMailer::Base+ and passing the values through.
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h4. +action_mailer.compile_config_methods+
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Initializes methods for the config settings specified so that they are quicker to access.
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h4. +active_resource.set_configs+
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Sets up Active Resource by using the settings in +config.active_resource+ by +send+'ing the method names as setters to +ActiveResource::Base+ and passing the values through.
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h4. +set_load_path+
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This initializer runs before +bootstrap_hook+. Adds the +vendor+, +lib+, all directories of +app+ and any paths specified by +config.load_paths+ to +$LOAD_PATH+.
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h4. +set_autoload_path+
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This initializer runs before +bootstrap_hook+. Adds all sub-directories of +app+ and paths specified by +config.autoload_paths+ to +ActiveSupport::Dependencies.autoload_paths+.
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h4. +add_routing_paths+
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Loads (by default) all +config/routes.rb+ files (in the application and railties, including engines) and sets up the routes for the application.
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h4. +add_locales+
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Adds the files in +config/locales+ (from the application, railties and engines) to +I18n.load_path+, making available the translations in these files.
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h4. +add_view_paths+
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Adds the directory +app/views+ from the application, railties and engines to the lookup path for view files for the application.
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h4. +load_environment_config+
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Loads the +config/environments+ file for the current environment.
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h4. +append_asset_paths+
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Finds asset paths for the application and all attached railties and keeps a track of the available directories in +config.static_asset_paths+.
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h4. +prepend_helpers_path+
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Adds the directory +app/helpers+ from the application, railties and engines to the lookup path for helpers for the application.
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h4. +load_config_initializers+
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Loads all files from +config/initializers+ in the application, railties and engines. The files in this directory can be used to hold configuration settings that should be made after all of the frameworks and plugins are loaded.
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*+load_config_initializers+* Loads all Ruby files from +config/initializers+ in the application, railties and engines. The files in this directory can be used to hold configuration settings that should be made after all of the frameworks and plugins are loaded.
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NOTE: You can use subfolders to organize your initializers if you like, because Rails will look into the whole file hierarchy from the +initializers+ folder on down.
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TIP: If you have any ordering dependency in your initializers, you can control the load order by naming. For example, +01_critical.rb+ will be loaded before +02_normal.rb+.
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h4. +engines_blank_point+
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*+engines_blank_point+* Provides a point-in-initialization to hook into if you wish to do anything before engines are loaded. After this point, all railtie and engine initializers are ran.
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Provides a point-in-initialization to hook into if you wish to do anything before engines are loaded. After this point, all railtie and engine initializers are ran.
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*+add_generator_templates+* Finds templates for generators at +lib/templates+ for the application, railities and engines and adds these to the +config.generators.templates+ setting, which will make the templates available for all generators to reference.
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h4. +add_generator_templates+
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*+ensure_autoload_once_paths_as_subset+* Ensures that the +config.autoload_once_paths+ only contains paths from +config.autoload_paths+. If it contains extra paths, then an exception will be raised.
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Finds templates for generators at +lib/templates+ for the application, railities and engines and adds these to the +config.generators.templates+ setting, which will make the templates available for all generators to reference.
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*+add_to_prepare_blocks+* The block for every +config.to_prepare+ call in the application, a railtie or engine is added to the +to_prepare+ callbacks for Action Dispatch which will be ran per request in development, or before the first request in production.
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h4. +ensure_autoload_once_paths_as_subset+
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*+add_builtin_route+* If the application is running under the development environment then this will append the route for +rails/info/properties+ to the application routes. This route provides the detailed information such as Rails and Ruby version for +public/index.html+ in a default Rails application.
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Ensures that the +config.autoload_once_paths+ only contains paths from +config.autoload_paths+. If it contains extra paths, then an exception will be raised.
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*+build_middleware_stack+* Builds the middleware stack for the application, returning an object which has a +call+ method which takes a Rack environment object for the request.
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h4. +add_to_prepare_blocks+
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*+eager_load!+* If +config.cache_classes+ is +true+, runs the +config.before_eager_load+ hooks and then calls +eager_load!+ which will load all the Ruby files from +config.eager_load_paths+.
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The block for every +config.to_prepare+ call in the application, a railtie or engine is added to the +to_prepare+ callbacks for Action Dispatch which will be ran per request in development, or before the first request in production.
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*+finisher_hook+* Provides a hook for after the initialization of process of the application is complete, as well as running all the +config.after_initialize+ blocks for the application, railties and engines.
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h4. +add_builtin_route+
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*+set_routes_reloader+* Configures Action Dispatch to reload the routes file using +ActionDispatch::Callbacks.to_prepare+.
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If the application is running under the development environment then this will append the route for +rails/info/properties+ to the application routes. This route provides the detailed information such as Rails and Ruby version for +public/index.html+ in a default Rails application.
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h4. +build_middleware_stack+
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Builds the middleware stack for the application, returning an object which has a +call+ method which takes a Rack environment object for the request.
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h4. +eager_load!+
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If +config.cache_classes+ is +true+, runs the +config.before_eager_load+ hooks and then calls +eager_load!+ which will load all the Ruby files from +config.eager_load_paths+.
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h4. +finisher_hook+
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Provides a hook for after the initialization of process of the application is complete, as well as running all the +config.after_initialize+ blocks for the application, railties and engines.
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h4. +set_routes_reloader+
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Configures Action Dispatch to reload the routes file using +ActionDispatch::Callbacks.to_prepare+.
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h4. +disable_dependency_loading+
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*+disable_dependency_loading+*
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h3. Changelog
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