title: Django model form with selected rows
body: <p>I have a django model roughly as  shown below:</p>
  
  <pre><code>class Event(db.Model):
     creator = db.ReferenceProperty(User, required= True)
     title = db.TextProperty(required = True)
     description = db.TextProperty(required = True)
  
  class Ticket(db.Model):
     user = db.ReferenceProperty(User, required = True)
     event = db.ReferenceProperty(Event, required = True)
     total_seats = db.IntegerProperty(required = True,default=0)
     available_seats = db.IntegerProperty(required = True,default=0)
  </code></pre>
  
  <p>Now I want to create a form from this model which should contain the events which are own by the logged in users only. Currently it shows a drop down with all the events in it.</p>
  
  <p>Is it possible with django forms? I am working on google app engine.</p>
  
  <p>Please suggest.</p>