diff options
Diffstat (limited to 'railties/guides/source/configuring.textile')
| -rw-r--r-- | railties/guides/source/configuring.textile | 71 |
1 files changed, 51 insertions, 20 deletions
diff --git a/railties/guides/source/configuring.textile b/railties/guides/source/configuring.textile index cad2d03c23..7e715ff79f 100644 --- a/railties/guides/source/configuring.textile +++ b/railties/guides/source/configuring.textile @@ -40,7 +40,9 @@ Rails will use that particular setting to configure Active Record. h4. Rails General Configuration -* +config.after_initialize+ takes a block which will be ran _after_ Rails has finished initializing the application. That includes the initialization of the framework itself, plugins, engines, and all the application's initializers in +config/initializers+. Useful for configuring values set up by other initializers: +These configuration methods are to be called on a +Rails::Railtie+ object, such as a subclass of +Rails::Engine+ or +Rails::Application+. + +* +config.after_initialize+ takes a block which will be run _after_ Rails has finished initializing the application. That includes the initialization of the framework itself, engines, and all the application's initializers in +config/initializers+. Note that this block _will_ be run for rake tasks. Useful for configuring values set up by other initializers: <ruby> config.after_initialize do @@ -64,7 +66,7 @@ NOTE. The +config.asset_path+ configuration is ignored if the asset pipeline is * +config.autoload_paths+ accepts an array of paths from which Rails will autoload constants. Default is all directories under +app+. -* +config.cache_classes+ controls whether or not application classes and modules should be reloaded on each request. Defaults to true in development mode, and false in test and production modes. Can also be enabled with +threadsafe!+. +* +config.cache_classes+ controls whether or not application classes and modules should be reloaded on each request. Defaults to false in development mode, and true in test and production modes. Can also be enabled with +threadsafe!+. * +config.action_view.cache_template_loading+ controls whether or not templates should be reloaded on each request. Defaults to whatever is set for +config.cache_classes+. @@ -80,21 +82,25 @@ NOTE. The +config.asset_path+ configuration is ignored if the asset pipeline is * +config.encoding+ sets up the application-wide encoding. Defaults to UTF-8. +* +config.exceptions_app+ sets the exceptions application invoked by the ShowException middleware when an exception happens. Defaults to +ActionDispatch::PublicExceptions.new(Rails.public_path)+. + +* +config.file_watcher+ the class used to detect file updates in the filesystem when +config.reload_classes_only_on_change+ is true. Must conform to +ActiveSupport::FileUpdateChecker+ API. + * +config.filter_parameters+ used for filtering out the parameters that you don't want shown in the logs, such as passwords or credit card numbers. * +config.force_ssl+ forces all requests to be under HTTPS protocol by using +Rack::SSL+ middleware. * +config.log_level+ defines the verbosity of the Rails logger. This option defaults to +:debug+ for all modes except production, where it defaults to +:info+. +* +config.log_tags+ accepts a list of methods that respond to +request+ object. This makes it easy to tag log lines with debug information like subdomain and request id -- both very helpful in debugging multi-user production applications. + * +config.logger+ accepts a logger conforming to the interface of Log4r or the default Ruby +Logger+ class. Defaults to an instance of +ActiveSupport::BufferedLogger+, with auto flushing off in production mode. * +config.middleware+ allows you to configure the application's middleware. This is covered in depth in the "Configuring Middleware":#configuring-middleware section below. -* +config.plugins+ accepts the list of plugins to load. The default is +nil+ in which case all plugins will be loaded. If this is set to +[]+, no plugins will be loaded. Otherwise, plugins will be loaded in the order specified. This option lets you enforce some particular loading order, useful when dependencies between plugins require it. For that use case, put first the plugins you want to be loaded in a certain order, and then the special symbol +:all+ to have the rest loaded without the need to specify them. - * +config.preload_frameworks+ enables or disables preloading all frameworks at startup. Enabled by +config.threadsafe!+. Defaults to +nil+, so is disabled. -* +config.reload_plugins+ enables or disables plugin reloading. Defaults to false. +* +config.reload_classes_only_on_change+ enables or disables reloading of classes only when tracked files change. By default tracks everything on autoload paths and is set to true. If +config.cache_classes+ is true, this option is ignored. * +config.secret_token+ used for specifying a key which allows sessions for the application to be verified against a known secure key to prevent tampering. Applications get +config.secret_token+ initialized to a random key in +config/initializers/secret_token.rb+. @@ -146,6 +152,7 @@ Rails 3.1, by default, is set up to use the +sprockets+ gem to manage assets wit * +config.assets.compile+ is a boolean that can be used to turn on live Sprockets compilation in production. +* +config.assets.logger+ accepts a logger conforming to the interface of Log4r or the default Ruby +Logger+ class. Defaults to the same configured at +config.logger+. Setting +config.assets.logger+ to false will turn off served assets logging. h4. Configuring Generators @@ -179,16 +186,17 @@ h4. Configuring Middleware Every Rails application comes with a standard set of middleware which it uses in this order in the development environment: -* +Rack::SSL+ Will force every request to be under HTTPS protocol. Will be available if +config.force_ssl+ is set to +true+. +* +Rack::SSL+ forces every request to be under HTTPS protocol. Will be available if +config.force_ssl+ is set to +true+. Options passed to this can be configured by using +config.ssl_options+. * +ActionDispatch::Static+ is used to serve static assets. Disabled if +config.serve_static_assets+ is +true+. -* +Rack::Lock+ Will wrap the app in mutex so it can only be called by a single thread at a time. Only enabled if +config.action_controller.allow_concurrency+ is set to +false+, which it is by default. -* +ActiveSupport::Cache::Strategy::LocalCache+ Serves as a basic memory backed cache. This cache is not thread safe and is intended only for serving as a temporary memory cache for a single thread. -* +Rack::Runtime+ Sets an +X-Runtime+ header, containing the time (in seconds) taken to execute the request. -* +Rails::Rack::Logger+ Notifies the logs that the request has began. After request is complete, flushes all the logs. -* +ActionDispatch::ShowExceptions+ Rescues any exception returned by the application and renders nice exception pages if the request is local or if +config.consider_all_requests_local+ is set to +true+. If +config.action_dispatch.show_exceptions+ is set to +false+, exceptions will be raised regardless. -* +ActionDispatch::RemoteIp+ Checks for IP spoofing attacks. Configurable with the +config.action_dispatch.ip_spoofing_check+ and +config.action_dispatch.trusted_proxies+ settings. -* +Rack::Sendfile+ Intercepts responses whose body is being served from a file and replaces it with a server specific X-Sendfile header. Configurable with +config.action_dispatch.x_sendfile_header+. -* +ActionDispatch::Callbacks+ Runs the prepare callbacks before serving the request. +* +Rack::Lock+ wraps the app in mutex so it can only be called by a single thread at a time. Only enabled if +config.action_controller.allow_concurrency+ is set to +false+, which it is by default. +* +ActiveSupport::Cache::Strategy::LocalCache+ serves as a basic memory backed cache. This cache is not thread safe and is intended only for serving as a temporary memory cache for a single thread. +* +Rack::Runtime+ sets an +X-Runtime+ header, containing the time (in seconds) taken to execute the request. +* +Rails::Rack::Logger+ notifies the logs that the request has began. After request is complete, flushes all the logs. +* +ActionDispatch::ShowExceptions+ rescues any exception returned by the application and renders nice exception pages if the request is local or if +config.consider_all_requests_local+ is set to +true+. If +config.action_dispatch.show_exceptions+ is set to +false+, exceptions will be raised regardless. +* +ActionDispatch::RequestId+ makes a unique X-Request-Id header available to the response and enables the +ActionDispatch::Request#uuid+ method. +* +ActionDispatch::RemoteIp+ checks for IP spoofing attacks. Configurable with the +config.action_dispatch.ip_spoofing_check+ and +config.action_dispatch.trusted_proxies+ settings. +* +Rack::Sendfile+ intercepts responses whose body is being served from a file and replaces it with a server specific X-Sendfile header. Configurable with +config.action_dispatch.x_sendfile_header+. +* +ActionDispatch::Callbacks+ runs the prepare callbacks before serving the request. * +ActiveRecord::ConnectionAdapters::ConnectionManagement+ cleans active connections after each request, unless the +rack.test+ key in the request environment is set to +true+. * +ActiveRecord::QueryCache+ caches all SELECT queries generated in a request. If any INSERT or UPDATE takes place then the cache is cleaned. * +ActionDispatch::Cookies+ sets cookies for the request. @@ -261,6 +269,10 @@ h4. Configuring Active Record * +config.active_record.whitelist_attributes+ will create an empty whitelist of attributes available for mass-assignment security for all models in your app. +* +config.active_record.identity_map+ controls whether the identity map is enabled, and is false by default. + +* +config.active_record.auto_explain_threshold_in_seconds+ configures the threshold for automatic EXPLAINs (+nil+ disables this feature). Queries exceeding the threshold get their query plan logged. Default is 0.5 in development mode. + The MySQL adapter adds one additional configuration option: * +ActiveRecord::ConnectionAdapters::MysqlAdapter.emulate_booleans+ controls whether Active Record will consider all +tinyint(1)+ columns in a MySQL database to be booleans and is true by default. @@ -331,7 +343,7 @@ Proc.new { |html_tag, instance| %Q(<div class="field_with_errors">#{html_tag}</d * +config.action_view.default_form_builder+ tells Rails which form builder to use by default. The default is +ActionView::Helpers::FormBuilder+. -* +config.action_view.logger+ accepts a logger conforming to the interface of Log4r or the default Ruby Logger class, which is then used to log information from Action Mailer. Set to +nil+ to disable logging. +* +config.action_view.logger+ accepts a logger conforming to the interface of Log4r or the default Ruby Logger class, which is then used to log information from Action View. Set to +nil+ to disable logging. * +config.action_view.erb_trim_mode+ gives the trim mode to be used by ERB. It defaults to +'-'+. See the "ERB documentation":http://www.ruby-doc.org/stdlib/libdoc/erb/rdoc/ for more information. @@ -447,7 +459,7 @@ Some parts of Rails can also be configured externally by supplying environment v h3. Using Initializer Files -After loading the framework and any gems and plugins in your application, Rails turns to loading initializers. An initializer is any Ruby file stored under +config/initializers+ in your application. You can use initializers to hold configuration settings that should be made after all of the frameworks, plugins and gems are loaded, such as options to configure settings for these parts. +After loading the framework and any gems in your application, Rails turns to loading initializers. An initializer is any Ruby file stored under +config/initializers+ in your application. You can use initializers to hold configuration settings that should be made after all of the frameworks and gems are loaded, such as options to configure settings for these parts. 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. @@ -461,12 +473,31 @@ Rails has 5 initialization events which can be hooked into (listed in the order * +before_initialize+: This is run directly before the initialization process of the application occurs with the +:bootstrap_hook+ initializer near the beginning of the Rails initialization process. -* +to_prepare+: Run after the initializers are ran for all Railties (including the application itself), but before eager loading and the middleware stack is built. +* +to_prepare+: Run after the initializers are ran for all Railties (including the application itself), but before eager loading and the middleware stack is built. More importantly, will run upon every request in +development+, but only once (during boot-up) in +production+ and +test+. * +before_eager_load+: This is run directly before eager loading occurs, which is the default behaviour for the _production_ environment and not for the +development+ environment. * +after_initialize+: Run directly after the initialization of the application, but before the application initializers are run. +To define an event for these hooks, use the block syntax within a +Rails::Aplication+, +Rails::Railtie+ or +Rails::Engine+ subclass: + +<ruby> +module YourApp + class Application < Rails::Application + config.before_initialize do + # initialization code goes here + end + end +end +</ruby> + +Alternatively, you can also do it through the +config+ method on the +Rails.application+ object: + +<ruby> +Rails.application.config.before_initialize do + # initialization code goes here +end +</ruby> WARNING: Some parts of your application, notably observers and routing, are not yet set up at the point where the +after_initialize+ block is called. @@ -503,7 +534,7 @@ Serves as a placeholder so that +:load_environment_config+ can be defined to run *+initialize_logger+* Initializes the logger (an +ActiveSupport::BufferedLogger+ object) for the application and makes it accessible at +Rails.logger+, provided that no initializer inserted before this point has defined +Rails.logger+. -*+initialize_cache+* If +RAILS_CACHE+ isn't set yet, 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. +*+initialize_cache+* If +Rails.cache+ isn't set yet, 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. *+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. @@ -541,7 +572,7 @@ The error occurred while evaluating nil.each *+action_controller.logger+* Sets +ActionController::Base.logger+ -- if it's not already set -- to +Rails.logger+. -*+action_controller.initialize_framework_caches+* Sets +ActionController::Base.cache_store+ -- if it's not already set -- to +RAILS_CACHE+. +*+action_controller.initialize_framework_caches+* Sets +ActionController::Base.cache_store+ -- if it's not already set -- to +Rails.cache+. *+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. @@ -583,7 +614,7 @@ The error occurred while evaluating nil.each *+prepend_helpers_path+* Adds the directory +app/helpers+ from the application, railties and engines to the lookup path for helpers for the application. -*+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. +*+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 are loaded. *+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. |