title: Query of a subquery in Django
body: <p>I'm trying to do a query from another query, but Django said: 'Caught DatabaseError while rendering: subquery returns more than 1 row.' I'm using PostGis.</p>
  
  <p>my model</p>
  
  <pre><code>class Place(models.Model):    
      coordinate = models.PointField()
  
  class TranslatedPlace(models.Model):
      place = models.ForeignKey(Place)
  </code></pre>
  
  <p>my view</p>
  
  <pre><code>  near_coordinates = Place.objects.filter(coordinate__distance_lte=(place_obj.coordinate, D(km=100)))
    near_places = TranslatedPlace.objects.filter(place=near_coordinates)
  </code></pre>