title: Accessing ReferenceProperty values in a one to many relation from a referenced key in Appengine?
body: <p>I am using AppEngine in Python and I have two Models using ndb  :</p>
  
  <pre><code># Post model
  class WikiPost(ndb.Model) :
      url  = ndb.StringProperty(required = True)
      content = ndb.TextProperty(required = True)
      date = ndb.DateProperty(auto_now_add = True)
  </code></pre>
  
  <p>Second Model</p>
  
  <pre><code>class WikiPostVersion(ndb.Model) :
      r_post = ndb.KeyProperty(kind = WikiPost)
      content = ndb.StringProperty()
      date = ndb.DateProperty(auto_now_add = True)
  </code></pre>
  
  <p>How I can Access the values of the referenced key r_post of the model WikiPostVersion?</p>