title: Rails helper modules in controller
body: <p>I have a controller, I want to create a helper for this controller that I can use without including it. I tried creating a helper with the same name as the controller like so </p>
  
  <pre><code>class Cars::EnginesController &lt; ApplicationController
    def start_engine
      check_fuel
    end
  end
  </code></pre>
  
  <p>and the helper that i created was</p>
  
  <pre><code>module Cars::EnginesHelper
    def check_fuel
      logger.debug("cheking fuel")
    end
  end
  </code></pre>
  
  <p>and the error that i got was </p>
  
  <pre><code>undefined local variable or method `check_fuel' for #&lt;Cars::EnginesController:0x1160e8c80&gt;
  </code></pre>
  
  <p>is there any conventions that i am missing out?</p>