ActionController::Metal provides a way to get a valid Rack application from a controller.

In AbstractController, dispatching is triggered directly by calling process on a new controller. ActionController::Metal provides an #action method that returns a valid Rack application for a given action. Other rack builders, such as Rack::Builder, Rack::URLMap, and the Rails router, can dispatch directly to the action returned by FooController.action(:index).

Methods
Public Class methods
action(name, klass = ActionDispatch::Request)

Return a rack endpoint for the given action. Memoize the endpoint, so multiple calls into MyController.action will return the same object for the same action.

Parameters

action<#to_s>

An action name

Returns

Proc

A rack application

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 176
def self.action(name, klass = ActionDispatch::Request)
  middleware_stack.build(name.to_s) do |env|
    new.dispatch(name, klass.new(env))
  end
end
call(env)

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 163
def self.call(env)
  action(env['action_dispatch.request.path_parameters'][:action]).call(env)
end
controller_name()

Returns the last part of the controller’s name, underscored, without the ending “Controller”. For instance, MyApp::MyPostsController would return “my_posts” for controller_name

Returns

String

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 63
def self.controller_name
  @controller_name ||= self.name.demodulize.sub(/Controller$/, '').underscore
end
inherited(base)

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 150
def self.inherited(base)
  base.middleware_stack = self.middleware_stack.dup
  super
end
middleware()

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  # File actionpack/lib/action_controller/metal.rb, line 159
def self.middleware
  middleware_stack
end
new(*)

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  # File actionpack/lib/action_controller/metal.rb, line 81
def initialize(*)
  @_headers = {"Content-Type" => "text/html"}
  @_status = 200
  super
end
use(*args, &block)

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  # File actionpack/lib/action_controller/metal.rb, line 155
def self.use(*args, &block)
  middleware_stack.use(*args, &block)
end
Public Instance methods
content_type()

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  # File actionpack/lib/action_controller/metal.rb, line 103
def content_type
  headers["Content-Type"]
end
content_type=(type)

Basic implementations for content_type=, location=, and headers are provided to reduce the dependency on the RackDelegation module in Renderer and Redirector.

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 99
def content_type=(type)
  headers["Content-Type"] = type.to_s
end
controller_name()

Delegates to the class’ controller_name

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 68
def controller_name
  self.class.controller_name
end
dispatch(name, request)

:api: private

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 134
def dispatch(name, request)
  @_request = request
  @_env = request.env
  @_env['action_controller.instance'] = self
  process(name)
  to_a
end
location()

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 107
def location
  headers["Location"]
end
location=(url)

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  # File actionpack/lib/action_controller/metal.rb, line 111
def location=(url)
  headers["Location"] = url
end
params()

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  # File actionpack/lib/action_controller/metal.rb, line 87
def params
  @_params ||= request.parameters
end
params=(val)

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  # File actionpack/lib/action_controller/metal.rb, line 91
def params=(val)
  @_params = val
end
response_body=(val)

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  # File actionpack/lib/action_controller/metal.rb, line 128
def response_body=(val)
  body = val.respond_to?(:each) ? val : [val]
  super body
end
status()

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  # File actionpack/lib/action_controller/metal.rb, line 120
def status
  @_status
end
status=(status)

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 124
def status=(status)
  @_status = Rack::Utils.status_code(status)
end
to_a()

:api: private

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 143
def to_a
  response ? response.to_a : [status, headers, response_body]
end
url_for(string)

basic url_for that can be overridden for more robust functionality

[ show source ]

  # File actionpack/lib/action_controller/metal.rb, line 116
def url_for(string)
  string
end