From: Pit Capitain <pit@...>
Date: 2004-11-07T20:51:24+09:00
Subject: Re: calling binding() within a module method (for mixin)?????

Ben schrieb:
> I've been trying to write a method that can dynamically mixin a module
> to a class. I tried the following code:
 > (... code using eval ...)

Hi Ben,

in order to avoid eval as Guy suggested, you could try

   module MixinUtils
     def self.includeMixin(klass, mixin)
       klass.send(:include, mixin)  # include is a private method
     end
   end

   module Foo
     def printFoo
       puts "foo"
     end
   end

   class Array
     def someMethod
       self.each do |item|
         MixinUtils.includeMixin(item.class, Foo)
         item.printFoo
       end
     end
   end

Calling

   [1,nil,true].someMethod

results in

   foo
   foo
   foo

as you expected.

Regards,
Pit