Recursive delete in google app engine

Question

I\'m using google app engine with django 1.0.2 (and the django-helper) and wonder how people go about doing recursive delete. Suppose you have a model that\'s something like thi

Answer 1

Reconsider the data structure. If the relationship will never change on the record lifetime, you could use "ancestors" feature of GAE:

class Top(db.Model): pass
class Middle(db.Model): pass
class Bottom(db.Model): pass

top = Top()
middles = [Middle(parent=top) for i in range(0,10)]
bottoms = [Bottom(parent=middle) for i in range(0,10) for middle in middles]

Then querying for ancestor=top will find all the records from all levels. So it will be easy to delete them.

descendants = list(db.Query().ancestor(top))
# should return [top] + middles + bottoms