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require 'action_view'
require 'action_controller'
require 'action_controller/log_subscriber'
module ActionController
# API Controller is a lightweight version of <tt>ActionController::Base</tt>,
# created for applications that don't require all functionality that a complete
# \Rails controller provides, allowing you to create controllers with just the
# features that you need for API only applications.
#
# An API Controller is different from a normal controller in the sense that
# by default it doesn't include a number of features that are usually required
# by browser access only: layouts and templates rendering, cookies, sessions,
# flash, assets, and so on. This makes the entire controller stack thinner,
# suitable for API applications. It doesn't mean you won't have such
# features if you need them: they're all available for you to include in
# your application, they're just not part of the default API Controller stack.
#
# By default, only the ApplicationController in a \Rails application inherits
# from <tt>ActionController::API</tt>. All other controllers in turn inherit
# from ApplicationController.
#
# A sample controller could look like this:
#
# class PostsController < ApplicationController
# def index
# @posts = Post.all
# render json: @posts
# end
# end
#
# Request, response and parameters objects all work the exact same way as
# <tt>ActionController::Base</tt>.
#
# == Renders
#
# The default API Controller stack includes all renderers, which means you
# can use <tt>render :json</tt> and brothers freely in your controllers. Keep
# in mind that templates are not going to be rendered, so you need to ensure
# your controller is calling either <tt>render</tt> or <tt>redirect</tt> in
# all actions, otherwise it will return 204 No Content response.
#
# def show
# @post = Post.find(params[:id])
# render json: @post
# end
#
# == Redirects
#
# Redirects are used to move from one action to another. You can use the
# <tt>redirect</tt> method in your controllers in the same way as
# <tt>ActionController::Base</tt>. For example:
#
# def create
# redirect_to root_url and return if not_authorized?
# # do stuff here
# end
#
# == Adding new behavior
#
# In some scenarios you may want to add back some functionality provided by
# <tt>ActionController::Base</tt> that is not present by default in
# <tt>ActionController::API</tt>, for instance <tt>MimeResponds</tt>. This
# module gives you the <tt>respond_to</tt> and <tt>respond_with</tt> methods.
# Adding it is quite simple, you just need to include the module in a specific
# controller or in <tt>ApplicationController</tt> in case you want it
# available to your entire app:
#
# class ApplicationController < ActionController::API
# include ActionController::MimeResponds
# end
#
# class PostsController < ApplicationController
# def index
# @posts = Post.all
#
# respond_to do |format|
# format.json { render json: @posts }
# format.xml { render xml: @posts }
# end
# end
# end
#
# Quite straightforward. Make sure to check <tt>ActionController::Base</tt>
# available modules if you want to include any other functionality that is
# not provided by <tt>ActionController::API</tt> out of the box.
class API < Metal
abstract!
# Shortcut helper that returns all the ActionController::API modules except the ones passed in the argument:
#
# class MetalController
# ActionController::API.without_modules(:Redirecting, :DataStreaming).each do |left|
# include left
# end
# end
#
# This gives better control over what you want to exclude and makes it easier
# to create an api controller class, instead of listing the modules required manually.
def self.without_modules(*modules)
modules = modules.map do |m|
m.is_a?(Symbol) ? ActionController.const_get(m) : m
end
MODULES - modules
end
MODULES = [
AbstractController::Rendering,
UrlFor,
Redirecting,
Rendering,
Renderers::All,
ConditionalGet,
RackDelegation,
BasicImplicitRender,
StrongParameters,
ForceSSL,
DataStreaming,
# Before callbacks should also be executed the earliest as possible, so
# also include them at the bottom.
AbstractController::Callbacks,
# Append rescue at the bottom to wrap as much as possible.
Rescue,
# Add instrumentations hooks at the bottom, to ensure they instrument
# all the methods properly.
Instrumentation,
# Params wrapper should come before instrumentation so they are
# properly showed in logs
ParamsWrapper
]
MODULES.each do |mod|
include mod
end
ActiveSupport.run_load_hooks(:action_controller, self)
end
end
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