def get_aggregation(self, using):
# Remove any aggregates marked for reduction from the subquery
# and move them to the outer AggregateQuery.
connection = connections[using]
for alias, aggregate in self.aggregate_select.items():
if isinstance(aggregate, gis_aggregates.GeoAggregate):
if not getattr(aggregate, 'is_extent',
False) or connection.ops.oracle:
self.extra_select_fields[alias] = GeomField()
return super(GeoQuery, self).get_aggregation(using)
def convert_values(self, value, field):
"""
Using the same routines that Oracle does we can convert our
extra selection objects into Geometry and Distance objects.
TODO: Make converted objects 'lazy' for less overhead.
"""
if SpatialBackend.oracle:
# Running through Oracle's first.
value = super(GeoQuery,
self).convert_values(value, field or GeomField())
if isinstance(field, DistanceField):
# Using the field's distance attribute, can instantiate
# `Distance` with the right context.
value = Distance(**{field.distance_att: value})
elif isinstance(field, AreaField):
value = Area(**{field.area_att: value})
elif isinstance(field, GeomField):
value = SpatialBackend.Geometry(value)
return value