order_by('-distance') not working as expected

Question

I am trying to make a database query that gives me 20 closest users ordered by the distance (so closest first) I am doing the follwoing

distance_mi = 100

origin = GEOSGeometry('SRID=4326;'+ 'POINT('+ str(user_profile.current_location.x)+' '+str(user_profile.current_location.y)+')')

close_users = UserProfile.objects.exclude(user = user).filter(current_location__distance_lte=(origin, D(mi=distance_mi))).distance(origin).order_by('-distance')[:20]

but this returns back 3 users (which is correct) but the first user is 0 mi away, the second is 8 mi away and the third is 0 mi away where as I am excepting the 8 mi user to be at the very end.

I am not sure what am I doing wrong in this.

Also, the UserProfile has the following Model

class UserProfile(models.Model):
    # This field is required.
    user = models.OneToOneField(User)
    # Other fields here
    current_location = models.PointField(null = True)
    seller_current_location = models.PointField(null = True)
    objects = models.GeoManager()
    def __unicode__(self):
        return u'%s' % (self.user.get_full_name())

Answer 1

Since your UserProfile contains more than one geographic field, you should specify the one you want with the field_name argument to distance().

UserProfile.objects.exclude(user=user).filter(current_location__distance_lte=(origin, D(mi=distance_mi))).distance(origin, field_name='current_location').order_by('distance')[:20]

See the documentation for more details.