Rails - Jan 2010 - Extending instance-methods of an Module for Plugin-Development

Don''t know if i should write this to rails or ruby mailinglist. But in
the
case i wan''t to extend the facebooker-plugin without touching it, i
will
here.

1. Instance-Methods of modules?
The methods in a module may be instance methods or module methods. Instance
methods appear as methods in a class when the module is included, module
methods do not. Conversely, module methods may be called without creating an
encapsulating object, while instance methods may not. (See
Module#module_function)

The method which i wan''t to alias in this case is a method which is
listed,
when i call:

puts Facebooker::Rails::Helpers.instance_methods

And it''s not listed, when i call:

puts Facebooker::Rails::Helpers.methods



2. What I wanna do?
I wan''t to extend facebooker with tracking-functionality for our
company.
For this, i want to write an second plugin which is loaded after it
(beginning with a letter higher then F).
In this plugin i wan''t to alias the methods from facebooker like

 alias_method :fb_multi_friend_selector_without_awesome,
:fb_multi_friend_selector

And write a new method which do the tracking and call the old


Why can''t i do this with:

module Facebooker
  module Rails
    module Helpers
        alias :fb_multi_friend_selector_without_awesome
:fb_multi_friend_selector
    end
  end
end


This should just be a normal plain method!!




This don''t work too:

module Facebooker
  module Rails
    module Helpers
      class << self
        alias :fb_multi_friend_selector_without_awesome
:fb_multi_friend_selector
      end
    end
  end
end

It seems this possibility just works when there are module-methods.





I have tried the following things, but none of this works (for me):

Facebooker::Rails::Helpers::InstanceMethods.module_eval do
  alias_method :fb_multi_friend_selector_without_awesome,
:fb_multi_friend_selector
end

(Don''t work because there are no Instance of the Module .. )




Theoretically i can Use the Name of the Class which included the model to
extend it this way. But for me, without any experience on developing on
rails itself it would be easier if i can extend the classes and modules
which are only defined in the facebooker-plugin.



Greetings from Germany,
Klaus



Regards
kb


http://klausbreyer.de


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