So, I've spent quite a long time working on this, with many nights
spent sleepless, and I've eventually managed to create a monster. :P
The class described in the following TG Docs link works quite well,
but could use some optimization which, alas, I do not have the skill
to perform. Basically it's a combination of a nested set model and
adjacency list model, giving you the joys of both. Some things, like
single-level children, are hard to query using pure nested sets,
whereas adjacency lists make those queries trivial.
The reason I'm posting it as-is is because I'll be porting this to
SQLAlchemy today. *winces*
http://docs.turbogears.org/1.0/HybridNestedSetModel
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