Rails Resque undefined method error in external module

问题

I'm having trouble calling methods from an included module inside a resque worker. In the example below, I keep getting undefined method errrors when I attempt to call the say method inside the worker (which is in the TestLib module). I've reduced the code down to bare basics to illustrate the issue:

Controller (/app/controllers/test_controller.rb)

class TestController < ApplicationController
  def testque
    Resque.enqueue( TestWorker, "HI" )
  end
end

Library (/lib/test_lib.rb)

module TestLib
  def say( word )
    puts word
  end
end

Worker (/workers/test_worker.rb)

require 'test_lib'

class TestWorker
  include TestLib

  @queue = :test_queue

  def self.perform( word )
    say( word ) #returns: undefined method 'say' for TestWorker:Class
    TestLib::say( word ) #returns: undefined method 'say' for TestLib::Module
  end
end

Rakefile (resque.rake)

require "resque/tasks"
task "resque:setup" => :environment

I'm running resque using the following command: rake environment resque:work QUEUE='*'

Gems: rails (3.0.4) redis (2.2.2) redis-namespace (1.0.3) resque (1.19.0)

Server: nginx/1.0.6

Anyone have any ideas as to what's going on there?

回答1:

When you include a module, its methods become instance methods. When you extend, they become class methods. You just need to change include TestLib to extend TestLib and it should work.

来源：https://stackoverflow.com/questions/8130071/rails-resque-undefined-method-error-in-external-module