Just a note to hopefully help others avoid some confusion ... When using the Tree Behaviour, the table should be setup such that it allows NULL, with it being the default. I know the http://book.cakephp.org/view/228/Basic-Usage page shows the SQL as such; however, I have this crazy habit of not allowing null if it doesn't have to be. The docs don't clearly state it must be null, so figured it would be ok. However, after getting frustrated with the `reorder()` function, I finally discovered that parent_id can't be '0', but 'null' if it's at the top.
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