From: Brian Candler <b.candler@...>
Date: 2011-01-26T07:18:24+09:00
Subject: Re: How to call a method from within a module or class.

Jason Cameron wrote in post #977476:
> module Outer_module
>   def make_it_a_double(parameter)
>     return parameter * 2
>   end
>
>   puts make_it_a_double(2)
> end
>
> I get the error:
> undefined method `make_it_a_double' for Outer_module:Module
> (NoMethodError)

What you've defined is an instance method (which would be available if 
you mixed it into a class). What you want is a method on the module 
itself.

Option 1:

module Outer_module
  def self.make_it_a_double(parameter)
    ...
  end
end

Option 2:

module Outer_module
  def make_it_a_double(parameter)
    ...
  end
  module_function :make_it_a_double
end

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