Morten Bek Ditlevsen writes:
> Hi there,
> I have an entity with a list property containing keys:
>
> favorites = db.ListProperty(db.Key, indexed=False)
>
> I suddenly came to wonder:
> If I check if a key is in the list like this:
>
> if thekey in user.favorites:
>
> will that by any chance try and fetch any entities in the user.favorites
> list?
>
> I don't think so, but I would like to make sure! :-)
When you do foo in bar it's actually calling Python methods, not the datastore
ops., and since
Python sees favorites as a list of keys it should not fetch the entities.
If you were to do index this and do it in datastore side ("WHERE favorites =
thekey") it might have to
"un-marshal" the property and do a normal lookup, but I don't think the
slowdown is noticeable.
--
Federico
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