resourceful_requests_helper.rb

module ResourcefulRequestHelper
  
  # Iterates through each route defined for the current controller, yielding
  # each one to allow the same set of assertions / expectations to be tested.
  # 
  # Usage:
  # ======
  # describe UsersController do
  #   let(:user) { double('user') }
  # 
  #   it "allows all standard resourceful actions" do
  #     all_resourceful_requests(user.id, name: 'Changed Name') do
  #       response.should be_success        
  #     end
  #   end
  # end
  #
  #
  # @param [int] the id of a resource to test member-based routes
  # @params [Hash] optional paramaters, not passed to collection-based routes
  def all_resourceful_requests(id, params = {})    

    controller_name  = subject.class.name.underscore.gsub(/_controller$/, '')
    pertinent_routes = Rails.application.routes.routes.select do |r| 
      r.defaults[:controller] == controller_name
    end
    
    pertinent_routes.each do |route|      
      # if the route refers to an instance, not a collection
      if route.conditions[:path_info].names.include?('id')
        self.send(route.verb.downcase, route.defaults[:action], params.merge(id: id))
      else
        self.send(route.verb.downcase, route.defaults[:action])
      end

      # yield to the example's expectations...
      yield      
    end 
  end
end