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v24	v25
45	45	}}}
46	46	Now let's see, what if condition returns True for a directory and its parent ? If the parent comes first in the main query, it will be modified, saved, reloaded when its child comes up later. If the child comes up first the parent is loaded, modified, saved, and then later on the original value from the outer query will be modified and saved, thus erasing the first change.
	47
	48	The lack of an identity map is the root cause of #8159 - foreign key error when deleting yourself. When an object is deleted it's id is set to None. If you delete yourself, your user is in memory twice. Once as the one being deleted, which gets its id correctly None-ed, and once as request.user, which doesn't.
47	49
48	50	=== Performance ===