It seems that the unique
constraint is not natively supported in GAE, although one can enforce unique
check before putting
an object to store.
But that was in January 2009, what about now? Can I specify unique
constraint on a column during schema creation? i.e.
class Account(db.Model):
name = db.StringProperty()
email = db.StringProperty() as unique # something like this
@classmethod
def create(cls, name, email):
a = Account(name=name, email=email)
a.put()
return a