python - App engine ndb. Query model based on Reference Property -

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I have some problems in querying the object while using NDB in the AppEngine framework for I It is very new and I think I understand some important concepts wrong.

Here's what I got:

I have my model code teacher (ndb.model) from the teacher : Webapp2_extras.appengine.auth.models : User = ndb.StructuredProperty (user) ranking = ndb.FloatProperty (required = true) as you can see, from webapp 2 framework Comes. Then I try to ask some affiliate teacher. I do it like this: 

  def _findTeacher (self, user): t = teacher. Curious (teacher.use == user). Fetch (1) If T: Returns T [0] Else: return Anyone   
 The user coming in the form of this function comes as follows:  < Pre>  user_session = self.auth.get_user_by_session () user = Self.auth.store.user_model.get_by_auth_token (user_session ['user_id'], user_session ['token']) [0]   
 However, I get the following error:  
  BadFilterError: invalid filter: non-empty repetitive property can not query for auth_ids   
 I would like to know where my mistake Land and example of an app using Andibi and Vebpp 2 Eighth system will be very useful.  
 thanks all   
 
 
 to:  
 
 Although a structured property can be duplicated and a structured property may include another structured property, be careful: if one is in a structured asset, only one of them can be repeated.   
 The error is happening because the teacher User is a structured property that includes teachers. The user .auth_ids, which is the repetitive Structured Sprouts.  
 Edit (solution):  
 I recommend doing this:  
  class teacher (ndb.model): user = ndb.KeyProperty ( User) Ranking = ndb.FloatProperty (required = true)   
 Store a reference for the user. It will work for your example above, however, it also means that you can not query any user properties, such as  Teacher.User.name == 'bob' .  
 And you will ask:  
  t = teacher.query (teacher.user == user.key) .fetch (1)   
 I hope it helps.

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