From: Phrogz <gavin@...>
Date: 2006-09-02T06:50:36+09:00
Subject: Re: How can I ask to which module a method belongs to?

> irb(main):001:0> load 'moddefining.rb'
> => true
> irb(main):002:0> String.module_defining('==')
> => String
> irb(main):003:0> String.module_defining('id')
> => Kernel
> irb(main):004:0> String.module_defining('map')
> => Enumerable

Sexy! :)

IMO something like this would make a nice addition to the core library.
Jumping through hoops for introspection is no fun. (At least this one
doesn't involve any string parsing.)

Note that the Method#inspect method gives you this same information in
string form:

irb(main):001:0> "".method( :== )
=> #<Method: String#==>
irb(main):002:0> String.instance_method( :== )
=> #<UnboundMethod: String#==>
irb(main):003:0> "".method( :id )
=> #<Method: String(Kernel)#id>
irb(main):004:0> String.instance_method( :id )
=> #<UnboundMethod: String(Kernel)#id>
irb(main):005:0> "".method( :map )
=> #<Method: String(Enumerable)#map>
irb(main):006:0> String.instance_method( :map )
=> #<UnboundMethod: String(Enumerable)#map>

Less or more reliable to use this with string parsing? Perhaps slightly
more, if only to be sure that the method resolution order is properly
followed.