diff options
Diffstat (limited to 'railties/guides/source/rails_on_rack.textile')
| -rw-r--r-- | railties/guides/source/rails_on_rack.textile | 57 |
1 files changed, 31 insertions, 26 deletions
diff --git a/railties/guides/source/rails_on_rack.textile b/railties/guides/source/rails_on_rack.textile index aa53aa6db6..d6cbd84b1f 100644 --- a/railties/guides/source/rails_on_rack.textile +++ b/railties/guides/source/rails_on_rack.textile @@ -89,36 +89,45 @@ $ rake middleware For a freshly generated Rails application, this might produce something like: <ruby> +use ActionDispatch::Static use Rack::Lock -use ActionController::Failsafe -use ActionController::Session::CookieStore, , {:secret=>"<secret>", :session_key=>"_<app>_session"} -use Rails::Rack::Metal -use ActionDispatch::RewindableInput -use ActionController::ParamsParser -use Rack::MethodOverride -use Rack::Head +use ActiveSupport::Cache::Strategy::LocalCache +use Rack::Runtime +use Rails::Rack::Logger +use ActionDispatch::ShowExceptions +use ActionDispatch::RemoteIp +use Rack::Sendfile +use ActionDispatch::Callbacks +use ActiveRecord::ConnectionAdapters::ConnectionManagement use ActiveRecord::QueryCache -run ActionController::Dispatcher.new +use ActionDispatch::Cookies +use ActionDispatch::Session::CookieStore +use ActionDispatch::Flash +use ActionDispatch::ParamsParser +use Rack::MethodOverride +use ActionDispatch::Head +use ActionDispatch::BestStandardsSupport +run Blog::Application.routes </ruby> Purpose of each of this middlewares is explained in the "Internal Middlewares":#internal-middleware-stack section. h4. Configuring Middleware Stack -Rails provides a simple configuration interface +config.middleware+ for adding, removing and modifying the middlewares in the middleware stack via +environment.rb+ or the environment specific configuration file <tt>environments/<environment>.rb</tt>. +Rails provides a simple configuration interface +config.middleware+ for adding, removing and modifying the middlewares in the middleware stack via +application.rb+ or the environment specific configuration file <tt>environments/<environment>.rb</tt>. h5. Adding a Middleware You can add a new middleware to the middleware stack using any of the following methods: -* +config.middleware.use(new_middleware, args)+ - Adds the new middleware at the bottom of the middleware stack. +* <tt>config.middleware.use(new_middleware, args)</tt> - Adds the new middleware at the bottom of the middleware stack. -* +config.middleware.insert_before(existing_middleware, new_middleware, args)+ - Adds the new middleware before the specified existing middleware in the middleware stack. +* <tt>config.middleware.insert_before(existing_middleware, new_middleware, args)</tt> - Adds the new middleware before the specified existing middleware in the middleware stack. -* +config.middleware.insert_after(existing_middleware, new_middleware, args)+ - Adds the new middleware after the specified existing middleware in the middleware stack. +* <tt>config.middleware.insert_after(existing_middleware, new_middleware, args)</tt> - Adds the new middleware after the specified existing middleware in the middleware stack. <ruby> -# config/environment.rb +# config/application.rb # Push Rack::BounceFavicon at the bottom config.middleware.use Rack::BounceFavicon @@ -133,7 +142,7 @@ h5. Swapping a Middleware You can swap an existing middleware in the middleware stack using +config.middleware.swap+. <ruby> -# config/environment.rb +# config/application.rb # Replace ActionController::Failsafe with Lifo::Failsafe config.middleware.swap ActionController::Failsafe, Lifo::Failsafe @@ -154,20 +163,21 @@ h4. Internal Middleware Stack Much of Action Controller's functionality is implemented as Middlewares. The following table explains the purpose of each of them: |_.Middleware|_.Purpose| -|+Rack::Lock+|Sets +env["rack.multithread"]+ flag to +true+ and wraps the application within a Mutex.| +|+Rack::Lock+|Sets <tt>env["rack.multithread"]</tt> flag to +true+ and wraps the application within a Mutex.| |+ActionController::Failsafe+|Returns HTTP Status +500+ to the client if an exception gets raised while dispatching.| |+ActiveRecord::QueryCache+|Enables the Active Record query cache.| -|+ActionController::Session::CookieStore+|Uses the cookie based session store.| -|+ActionController::Session::MemCacheStore+|Uses the memcached based session store.| +|+ActionDispatch::Session::CookieStore+|Uses the cookie based session store.| +|+ActionDispatch::Session::CacheStore+|Uses the Rails cache based session store.| +|+ActionDispatch::Session::MemCacheStore+|Uses the memcached based session store.| |+ActiveRecord::SessionStore+|Uses the database based session store.| -|+Rack::MethodOverride+|Sets HTTP method based on +_method+ parameter or +env["HTTP_X_HTTP_METHOD_OVERRIDE"]+.| +|+Rack::MethodOverride+|Sets HTTP method based on +_method+ parameter or <tt>env["HTTP_X_HTTP_METHOD_OVERRIDE"]</tt>.| |+Rack::Head+|Discards the response body if the client sends a +HEAD+ request.| TIP: It's possible to use any of the above middlewares in your custom Rack stack. h4. Customizing Internal Middleware Stack -It's possible to replace the entire middleware stack with a custom stack using +ActionController::Dispatcher.middleware=+. +It's possible to replace the entire middleware stack with a custom stack using <tt>ActionController::Dispatcher.middleware=</tt>. Put the following in an initializer: @@ -198,7 +208,7 @@ The following shows how to replace use +Rack::Builder+ instead of the Rails supp <strong>Clear the existing Rails middleware stack</strong> <ruby> -# environment.rb +# config/application.rb config.middleware.clear </ruby> @@ -207,7 +217,7 @@ config.middleware.clear <ruby> # config.ru -use MyOwnStackFromStratch +use MyOwnStackFromScratch run ActionController::Dispatcher.new </ruby> @@ -223,8 +233,3 @@ h4. Learning Rack h4. Understanding Middlewares * "Railscast on Rack Middlewares":http://railscasts.com/episodes/151-rack-middleware - -h3. Changelog - -* February 7, 2009: Second version by "Pratik":credits.html#lifo -* January 11, 2009: First version by "Pratik":credits.html#lifo |