you can achieve this in polymodel by adding all common properties to
polymodel base class and specific property to the hierarchy.
i.e.
Class LivingThing(polymodel.PolyModel):
Kingdom = db.StringProperty()
Phylum = db.StringProperty()
Subphylum = db.StringProperty()
Class Mammal(LivingThing):
noofbreast = db.IntegerProperty()
class Monkey(Mammal):
canjump = db.BooleanProperty()
now you can create class monkey as,
Monkey(Kingdom="Animal",canjump=True)
and later query as LivingThing.filter("Kingdom =","Animal").fetch()
can return Monkey.
On Jul 19, 1:04 pm, Bill Edwards <[email protected]> wrote:
> Hi!
>
> I've been recently trying to wrap my head around GAE's datatypes. Is
> there a model type in GAE that allows me to define subproperties? For
> example, I want to have a "category" property where some categories
> fall under others, and when i query for all entities within a
> supercategory, i get the subcategories also.
>
> For example:
> class Animals(db.Model):
> type = db.StringProperty()
>
> Animals(type='mammal')
> Animals(type='chimpanzee')
> Animals(type='monkey')
>
> When I query for all animals with type mammal, i want to return all 3
> of the above objects.
>
> I've read through the documentation, and the PolyModel datastore model
> has struck my eye as being potentially helpful. However, it doesn't
> seem to quite do the job.
>
> Thanks!
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