From: "Sven S." <svoop@...>
Date: 2010-03-23T18:29:56+09:00
Subject: Re: Callbacks when deleting self-referenced has_many?

Figured it out, I should be using the association callbacks. For some 
odd reason, I've never needed them up until now:

http://guides.rubyonrails.org/association_basics.html#association-callbacks
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