Does App Engine allow self-referencing queries, where I use a property
of an entity as part of the filter? For example, below I am attempting
to use the "question_ttl" property to filter questions that are
expired (e.g. older than "question_ttl" minutes). I'm attempting to
avoid having to iterate through the entire batch. Is this possible? I
attempted to use "self" below, but that doesn't work.
--------------------
class WaitingQuestions(db.Model):
question = db.TextProperty()
question_ttl = db.IntegerProperty()
timestamp = db.DateTimeProperty(auto_now=True, auto_now_add=True)
@staticmethod
def get_expired_questions():
return WaitingAnswer.all().filter('timestamp < ',
datetime.now() - timedelta(minutes=self.question_ttl))
--------------------
Any help would be much appreciated. Thank you in advance,
Lenny
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