Getting implicit property names on a db.Model in Google App Engine?

Question

How can I get access to the implicit property names of a db.Model in Google App Engine? In particular, assume I have the following:

class Foo(db.Model):
  specific = db.IntegerProperty()


class Bar(db.Model):
 foo = db.ReferenceProperty(Foo, collection_name = "bars") 

if I attempt to get the property names on Foo, like so:

my_foo = Foo(specific = 42)
for key, prop in my_foo.properties().iteritems()
    print "HERE bars won't show up"

then the my_foo.bars property doesn't show up. Or am I totally mistaken?

Any help greatly appreciated

edited model to be Python, not ruby

Answer 1

(That model definition looks like a strange hybrid of Python and Ruby.)

I'm not clear on what you're trying to achieve here, but you can get a list of model property members using introspection:

[x for x in dir(Foo) if isinstance(getattr(Foo,x), db.Property)]

If you're just trying to add instances of Bar to Foo, you should create new Bar instances with their foo fields pointing at the Foo instance:

foo = Foo(specific=42)
foo.put()
Bar(foo=foo).put()
Bar(foo=foo).put()
logging.info("Foo bars: %r" % list(foo.bars))

Answer 2

See if this helps you

http://stackoverflow.com/questions/1062108/obtain-collection-name-from-parents-key-in-gae