Ruby: Is it possible to define a class method in a module?

Question

Say there are three classes: A, B & C. I want each class to have a class method, say self.foo, that has exactly the s

Answer 1

Yep

module Foo
  def self.included(base)
    base.extend(ClassMethods)
  end
  module ClassMethods
    def some_method
      # stuff
    end
  end
end

One possible note I should add - if the module is going to be ALL class methods - better off just using extend ModuleName in the Model and defining the methods directly in the module instead - rather than having a ClassMethods module inside the Module, a la

 module ModuleName
   def foo
     # stuff
   end
 end