This is just another example showing how I refactor code down to its bare minimum. The reason why I do this so much (and indeed I think why ruby is so easy to read compared to other languages) is because it makes my code more readable and less of a bugger to pick up after a while.
Page.find( self.parent_id )
return Page.find( self.parent_id ) if self.parent?
parent return exactly the same, but one is 2 lines compared to 5 and easier to read.
Update: Ciaran pointed out that the Page.parent method would only ever return false. Added the return statement to it to fix the bug.