From: James Edward Gray II <james@...>
Date: 2010-02-02T06:55:26+09:00
Subject: Re: Module children

On Feb 1, 2010, at 3:38 PM, Ryan Davis wrote:

> 
> On Feb 1, 2010, at 13:06 , Aaron Patterson wrote:
> 
>> On Tue, Feb 02, 2010 at 04:50:34AM +0900, Camille Roux wrote:
>>> Hello,
>>> 
>>> I'd like to get the list of all the classes contained in a module.
>>> What's the simple way to do that?
>> 
>>>> module Foo; A = 1; class B; end; module C; end end
>> => nil
>>>> Foo.constants.find_all { |k| Class === Foo.const_get(k) }
>> => ["B"]
> 
> Personally, I usually map first:
> 
>>> Foo.constants.map { |s| Foo.const_get s }.find_all { |k| Class === k }
> => [Foo::B]

Then you can switch the the under loved grep():

>> Foo.constants.map { |s| Foo.const_get s }.grep(Class)
=> [Foo::B]

James Edward Gray II