Hi David,
I'm having some trouble understanding your reply

> class Like(db.Model):
>     topic = db.StringProperty() #enumeration
>     user = db.ReferenceProperty(User)
>
 
By enumeration, do you mean a number representing the thing being liked?
So for example
topic = 5
(where 5 might mean "Dogs")?

>
> Your key strategy can be (serial of topic + user.key().name())
>
> Are you saying the key for a Like might be ("Dogs" + "John Smith")?

Forgive me, I might be too much of a newb to understand this. 

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