I am using a factory pattern to model my data. Creating the data is
simple. Retrieving it is hard.
class Owner()
class Base(db.Model)
group = StringProperty(default="abc")
@classmethod
def factory(): ...
class Sub1(Base)
class Sub2(Base)
Problem: I want to query for all classes with ancestor == owner (and
group == 'abc').
So to say run a query against a whole entity group. However it appears
I can only retrieve a "Kind"/Class at a time?
Base.all().ancestor(owner).fetch(100) will only return Base instances
not Sub1 and Sub2
Sub1.all().ancestor(owner).fetch(100) will only return Sub1s
Question: Is there any query that could return mixed type lists?
Some solutions I can think of is
* to add a 1000 item ListProperty(RefereneProperty) to Owner ... needs
to be filtered manually by group (slow?)
* to use Base(Expando) with a type property instead using
subclasses ... loose some prop checking
Is there a better way to do that?
Thanks,
Thomas
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