From: "David A. Black" <dblack@...>
Date: 2005-08-26T22:17:50+09:00
Subject: Re: Circular dependecy on classes

Hi --

On Fri, 26 Aug 2005, Robert Klemme wrote:

> 2005/8/26, Derek Wyatt <derek@derekwyatt.org>:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>>
>> I think you're simply using an instance variable where a method is
>> what you want.  Take advantage of the runtime compile/binding that
>> you're currently having problems with.  Do this instead:
>>
>> class Solder
>> ~  def can_upgrade_to
>> ~    [Knight]
>> ~  end
>> end
>>
>> And your problems go away.  You don't have to open it up later.  If
>> you want it private, you can simply make it private.
>
> Doesn't solve the OP'S problem because it was about dependencies:
> Knight has to be defined when it is used.

As long as it's defined before the method is called it should be OK:

   class C
     def can_upgrade_to
       [D]
     end
   end

   class D
   end

   p C.new.can_upgrade_to[0].new  # #<D:0x401c0db8>


David

-- 
David A. Black
dblack@wobblini.net