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python - AppEngine Making ndb models json serializable

We have an ndb model that we would like to make json serializable. The models are fairly simple along the lines of:

class Pasta(ndb.Model):
   name = ndb.StringProperty()
   type = ndb.StringProperty()
   comments = ndb.JsonProperty()

Then on the handler side we would like to do something along the lines of:

json.dumps(Pasta.query(Pasta.name=="Ravioli").fetch()) and return it to the client, but it keeps throwing json parse errors since the class Pasta is not json serializable. So, the question is, do we have to implement __str__ or __repr__ or is there a niftier way to do it?

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