module ActionController #:nodoc: # Components allows you to call other actions for their rendered response while execution another action. You can either delegate # the entire response rendering or you can mix a partial response in with your other content. # # class WeblogController < ActionController::Base # # Performs a method and then lets hello_world output its render # def delegate_action # do_other_stuff_before_hello_world # render_component :controller => "greeter", :action => "hello_world", :params => { "person" => "david" } # end # end # # class GreeterController < ActionController::Base # def hello_world # render_text "#{@params['person']} says, Hello World!" # end # end # # The same can be done in a view to do a partial rendering: # # Let's see a greeting: # <%= render_component :controller => "greeter", :action => "hello_world" %> module Components def self.append_features(base) #:nodoc: super base.helper do def render_component(options) @controller.send(:render_component_as_string, options) end end end protected # Renders the component specified as the response for the current method def render_component(options = {}) #:doc: component_logging(options) { render_text(component_response(options).body, response.headers["Status"]) } end # Returns the component response as a string def render_component_as_string(options) #:doc: component_logging(options) { component_response(options, false).body } end private def component_response(options, reuse_response = true) component_class(options).process(request_for_component(options), reuse_response ? @response : response_for_component) end def component_class(options) options[:controller] ? (options[:controller].camelize + "Controller").constantize : self.class end def request_for_component(options) request_for_component = @request.dup request_for_component.send( :instance_variable_set, :@parameters, (options[:params] || {}).merge({ "controller" => options[:controller], "action" => options[:action], "id" => options[:id] }).with_indifferent_access ) return request_for_component end def response_for_component @response.dup end def component_logging(options) logger.info("Start rendering component (#{options.inspect}): ") unless logger.nil? result = yield logger.info("\n\nEnd of component rendering") unless logger.nil? return result end end end