Access controller's methods in anywhere.

store_controller.rb

module StoreController
  @@controllers = Hash.new

  Finalizer = lambda { |id|
    @@controllers.delete id
  }

  class << self
    def set_controller(controller)
      unless @@controllers.has_key?(Thread.current.object_id)
        ObjectSpace.define_finalizer Thread.current, Finalizer
      end if RUBY_VERSION != "1.9.3"
      @@controllers[Thread.current.object_id] = controller
    end

    def get_controller
      @@controllers[Thread.current.object_id]
    end

    def unset_controller
      Finalizer.call(Thread.current.object_id)
    end
  end

  module Model
    # ADICIONAR AO MODEL
    # include StoreController::Model
    # store_controller_method :current_customer do |controller|
    #   controller && controller.current_customer
    # end
    extend ActiveSupport::Concern

    module ClassMethods
      def store_controller_method(method_name, &block)
        define_method(method_name) { block.call(StoreController.get_controller) }
      end
    end
  end

  module Controller
    # ADICIONAR AO CONTROLLER
    # include StoreController::Controller
    extend ActiveSupport::Concern

    included do
      before_filter :set_store_controller
      after_filter :unset_store_controller
    end

    private
    def set_store_controller
      StoreController.set_controller(self)
    end

    def unset_store_controller
      StoreController.unset_controller
    end
  end
end