id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
22352	GeoQuerySet methods: support lookups on reversed o2o relationships as field_name	pchiquet	anonymous	"GeoQuerySet methods, for example ''distance'', are performed on a given geographic field of the model.

The geographic field to use can be specified thanks the '''field_name''' argument. '''field_name''' can be a field directly in the model or a lookup to a related field in another model (such as, {{{'address__point'}}}). However '''lookups with reversed one to one relation are not supported'''.

For example, with the following model:
{{{
#!python
class User(Model):
    pass

class UserProfile(NamedModel):
    user = models.OneToOneField(User)
    point = models.PointField()
}}}

the following spatial operation on User fails:
{{{
#!python
  User.objects.all().distance(Point(1,1), field_name='userlocation__point')
}}}

and raises the following exception:
{{{
  Traceback (most recent call last):
    (...)
    File ""django/contrib/gis/db/models/query.py"", line 104, in distance
      return self._distance_attribute('distance', geom, **kwargs)
    File ""django/contrib/gis/db/models/query.py"", line 593, in _distance_attribute
      procedure_args, geo_field = self._spatial_setup(func, field_name=kwargs.get('field_name', None))
    File ""django/contrib/gis/db/models/query.py"", line 466, in _spatial_setup
      raise TypeError('%s output only available on GeometryFields.' % func)
  TypeError: ST_Distance output only available on GeometryFields.
}}}

The lookup is supported only if the foreign key is in the Queryset model. I think it would be nice to support reversed relations too."	New feature	closed	GIS	dev	Normal	wontfix	geodjango, GeoQuerySet	mmitar@… jernej@…	Accepted	1	0	0	1	0	0