Yo tengo unOrder modelo, que tiene unorigin PointField y unarange IntegerField. Además, hay unaUserProfile model, que tiene ungeo_location PointField. Ahora tengo unaUser instancia,user. Quiero seleccionar todosOrders, cuya distancia entreOrder.origin yuser.userprofile.geo_location es menor que el valor (metros) enOrder.range campo modelo.

Así que de nuevo, modelos simplificados:

class Order(models.Model):
    origin = models.PointField()
    range = models.IntegerField(blank=True, default=10000)

class UserProfile(models.Model):
    geo_location = models.PointField()

Tengo esto funcionando (pasando la distancia estáticamente):

>>> Order.objects.filter(origin__distance_lte=(user.profile.geo_location, D(m=3000)))

Mi siguiente intento (sin éxito) fue usar unF( expresión para usar el valor deOrder.range campo:

>>> Order.objects.filter(origin__distance_lte=(user.profile.geo_location, D(m=F('range'))))
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/contrib/gis/measure.py", line 165, in __init__
self.m, self._default_unit = self.default_units(kwargs)
  File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/contrib/gis/measure.py", line 49, in default_units
if not isinstance(value, float): value = float(value)
 TypeError: float() argument must be a string or a number

Creo que el problema es que el D () no se ejecuta perezosamente, puedo entender eso. Así que traté de tomar el valor bruto de larange field (entero) que supuse que funcionaba, pero:

>>> Order.objects.filter(origin__distance_lte=(user.profile.geo_location, F('range')))
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/query.py", line 69, in __repr__
data = list(self[:REPR_OUTPUT_SIZE + 1])
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/query.py", line 84, in __len__
self._result_cache.extend(self._iter)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/query.py", line 273, in iterator
for row in compiler.results_iter():
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 680, in results_iter
for rows in self.execute_sql(MULTI):
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 725, in execute_sql
sql, params = self.as_sql()
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 68, in as_sql
where, w_params = self.query.where.as_sql(qn=qn, connection=self.connection)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/where.py", line 92, in as_sql
sql, params = child.as_sql(qn=qn, connection=connection)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/db/models/sql/where.py", line 95, in as_sql
sql, params = self.make_atom(child, qn, connection)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/contrib/gis/db/models/sql/where.py", line 47, in make_atom
spatial_sql = connection.ops.spatial_lookup_sql(data, lookup_type, params_or_value, lvalue.field, qn)
File "/Users/danger/devel/.virtualenvs/proj/lib/python2.7/site-packages/django/contrib/gis/db/backends/postgis/operations.py", line 531, in spatial_lookup_sql
raise ValueError('Argument type should be %s, got %s instead.' % (arg_type, type(value[1])))
ValueError: Argument type should be (<class 'decimal.Decimal'>, <class 'django.contrib.gis.measure.Distance'>, <type 'float'>, <type 'int'>, <type 'long'>), got <class 'django.db.models.expressions.F'> instead.

Entonces, ¿cómo puedo lograr lo que estoy tratando de hacer? Cualquier ayuda es apreciada!