title: AppEngine Making ndb models json serializable
body: <p>We have an ndb model that we would like to make json serializable. The models are fairly simple along the lines of:</p>
  
  <pre><code>class Pasta(ndb.Model):
     name = ndb.StringProperty()
     type = ndb.StringProperty()
     comments = ndb.JsonProperty()
  </code></pre>
  
  <p>Then on the handler side we would like to do something along the lines of:</p>
  
  <p><code>json.dumps(Pasta.query(Pasta.name=="Ravioli").fetch())</code> 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 <code>__str__</code> or <code>__repr__</code> or is there a niftier way to do it?</p>