python 2.7 - Google App Engine error: NeedIndexError: no matching index found

Question

I'm having trouble with Google's App engine indexes. When running my app via the GoogleAppEngineLauncher, the app is working fine. When deploying the app, I get the following error:

NeedIndexError: no matching index found.
The suggested index for this query is:
- kind: Bar
  ancestor: yes
  properties:
  - name: rating
    direction: desc

The error is generated after this line of code:

 bars = bar_query.fetch(10)

Before the above line of code, it reads:

bar_query = Bar.query(ancestor=guestbook_key(guestbook_name)).order(-Bar.rating)

My index.yaml file contains the exact "suggested" index below # AUTOGENERATED:

- kind: Bar
  ancestor: yes
  properties:
  - name: rating
    direction: desc

Am I maybe missing something? I removed the index.yaml file and deployed the app again (via the command-line) and one less file was uploaded - so the index.yaml file is there.

Everything is working fine locally. I'm working on the latest Mac OSx. The command used for deployment was:

appcfg.py -A app-name --oauth2 update app

The datastore I implemented is loosely based on the guestbook tutorial app.

Any help would be greatly appreciated.

EDIT:

My ndb.Model is defined as follow:

class Bar(ndb.Model):
    content = ndb.StringProperty(indexed=False)
    lat = ndb.FloatProperty(indexed=False)
    lon = ndb.FloatProperty(indexed=False)
    rating = ndb.IntegerProperty(indexed=True)
    url = ndb.TextProperty(indexed=False)

Answer 1

Waitting for answers