如何使在Rails引擎的应用程序控制器中定义的方法自动适用于安装它的任何其他引擎？

Question

Rails 3.2 engine A is a logger engine and there is a logger method (create an entry in log table) defined in its application controller . Engine B mounts engine A and engine B's model or controller will call logger method in engine A for logging. Is there a way logger method in engine A could be called by engine B without using include or require ? Basically we want logger method in engine A to be automatically available for any other engines which mount it.

Answer 1

In your engine's application controllers, inherit from parent application controller:

module EngineA
  class ApplicationController < ::ApplicationController
  ..