title: How do I make child and parent entities in GAE Python?
body: <p>I have the following database models in my application:</p>
  
  <pre><code>class Account(ndb.Model):
      username = ndb.StringProperty()
      userid = ndb.IntegerProperty()
      email = ndb.StringProperty()
  
  class Post(nbd.Model):
      text = nbd.StringProperty()
  </code></pre>
  
  <p>How can I tell the program that "many posts belong to one account" ?</p>
  
  <p>Thanks!</p>