Fast Rails API with ActionController::Metal

	#app/controllers/api/api_controller.rb
	class Api::ApplicationController < ActionController::Metal
	include ActionController::Rendering
	respond_to :json
	end
	#app/controllers/api/v1/tasks_controller.rb
	module Api
	module V1
	class TasksController < Api::ApplicationController
	def do_something
	render :json => Task.find(params[:id]).to_json
	end
	end
	end
	end
	#routes
	namespace :api , defaults: {format: 'json'} do
	namespace :v1 do
	resources :tasks, :only => [] do
	member do
	get 'do_something'
	end
	end
	end
	end

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