GeoQuerySet creates invalid SQL on calls to `__nonzero__` or `__len__`

[wardi]

from django.contrib.gis.db import models
from django.contrib.gis.geos import Point

class Location(models.Model):
    point = models.PointField()

bool(Location.objects.filter(point=Point(1,0)))

causes an exception in the regular django db layer (not the gis one), it looks like the implementation of __nonzero__ and __len__ in QuerySet are not properly overridden by GeoQuerySet.

[jbronn]

You forgot:

    objects = models.GeoManager()

See also the ​GeoManager documentation.

[wardi]

Thanks jbronn!

The error is a little misleading, though, and the result of user error probably shouldn't be generating invalid SQL.

Ian