Rails - Aug 2007 - Using helper_method from a Mixin Module

Hi,

I have a module with a helper method in it. I want to automatically
declare the method as a helper when I mix the module into a controller
class, so the mixin basically sets itself up. Something like :-

module MyMixin

  # I want to do helper method here in the module
  helper_method :my_helper

  def my_helper
    puts "foo"
  end
end

---

class MyController < ApplicationController

  include MyMixin

#  I dont'' want to have to do helper_method in the controller
#  helper_method :my_helper

---

This does not work as I want, I have to do "helper_method" in the
controller class itself. If I try to do it in the module I get an error
like this :-

undefined method `helper method` for MyMixin:Module

Is there a way to achieve this?
-- 
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Hi --

On Sat, 11 Aug 2007, John Lane wrote:
>
> Hi,
>
> I have a module with a helper method in it. I want to automatically
> declare the method as a helper when I mix the module into a controller
> class, so the mixin basically sets itself up. Something like :-
>
> module MyMixin
>
>  # I want to do helper method here in the module
>  helper_method :my_helper
>
>  def my_helper
>    puts "foo"
>  end
> end
>
> ---
>
> class MyController < ApplicationController
>
>  include MyMixin
>
> #  I dont'' want to have to do helper_method in the controller
> #  helper_method :my_helper
>
> ---
>
> This does not work as I want, I have to do "helper_method" in the
> controller class itself. If I try to do it in the module I get an error
> like this :-
>
> undefined method `helper method` for MyMixin:Module
>
> Is there a way to achieve this?
Try this (untested):

   module MyMixin
     def self.included(c)
       c.helper_method :my_helper
     end

     def my_helper
       etc.
     end
   end

The idea is to call the included callback, which allows you to operate
on the class that''s doing the including.


David

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Many thanks for this, it works beautifully!
>    module MyMixin
>      def self.included(c)
>        c.helper_method :my_helper
>      end
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