Question

I have the following 3 classes:

class Locality(db.Model):
  location = db.ReferenceProperty()

class Organisation(db.Model):
  locality = db.ReferenceProperty(Locality)

class Position(db.Model):
  locality = db.ReferenceProperty(Locality)

Locality.location property is reference to Organisation or Position object.
I need to filter by Locality and get all entries with reference to Organisation.

I already tried, but it won’t work:

Locality.all().filter("location =",Organisation)

Any advices will be appreciated.

Answer 1

Finally, I found the solution based on PolyModels:

class Locality(polymodel.PolyModel):
  { geo properties here }

class Organisation(Locality):
  title = db.StringProperty()

class Position(Locality):
  title = db.StringProperty()

To get all organisations filtered by geo properties:

Organisation.all().filter({by geo properties of Locality model})

To get all localities (organisations + positions) filtered by geo properties:

Locality.all().filter({by geo properties of Locality model})

I guess, my initial explanation was very unclear. Sorry for that. And thank you all, for your advices. They were very useful.