Just noticed there is a small typo in the code above, the query should
be hitting "WaitingQuestions", not "WaitingAnswer".
On Dec 15, 11:00 am, Lenny Rachitsky <lenny...@gmail.com> wrote:
> 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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