From: Mike Gold <mike.gold.4433@...>
Date: 2009-01-26T08:35:29+09:00
Subject: Re: unalias a method?

Todd Burch wrote:
>  
> I'm assuming that alias_method is what I need to be using to temporarily 
> "redirect" all my Foo.hello calls to do something different for a 
> certain period of time, and finally I want to revert to the original 
> behavior of Foo.hello.
> 

In that case, maybe push/pop would make things easier.

module MethodStack
  class << self
    def included(includer)
      stack = Hash.new

      define_method(:push_method) { |method_name, &block|
        unless stack.has_key?(method_name)
          stack[method_name] = [instance_method(method_name)]
        end
        stack[method_name].push(block)
        define_method(method_name, &block)
      }

      define_method(:pop_method) { |method_name|
        stack[method_name].pop
        define_method(method_name, stack[method_name].last)
      }
    end
  end
end

class Foo
  class << self
    include MethodStack
  end
  def hello
    p "original hello"
  end
end

obj = Foo.new
obj.hello # => "original hello"

class Foo
  push_method(:hello) {
    p "replacement hello"
  }
end

obj.hello # => "replacement hello"
Foo.pop_method(:hello)
obj.hello # => "original hello"
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