Gql and object inheritance

I am working on an AppEngine project using the Kay Framework.

I was testing my queries in Kay Framework's shell. If you are familiar with Django's shell it is essentially the same.

Running the following query :

query = db.GqlQuery("select * from MyUserObject where user_name = :1 and password = :2")

I got this error :

raise KindError('No implementation for kind \'%s\'' % kind)

I had imported the object. My object inherits from the framework's DatatstoreUser.

Apparently the ORM sometimes struggles with inherited classes in different packages.

Changing to the following :

query = MyUserObject.gql("where user_name = :1", "testuser@testuser.com")

provided exactly what I needed.