[Catalyst] Usage of Catalyst::Plugin::Singleton

[John Lifsey - Contractor -]

> Now you want any Category to be related to any other category. Call
> that, say CategoryAssocs and give it two columes 'id1' and 'id2'.
>
> Now to relate any two categories you simply put the id of each
> category into id1 and id2.
>
>   
I was about to do something similar, wouldn't it be better to have 
another column in category for parent_id?

John