#26112: Aggregate Sum of GIS Aggregates fails
----------------------------+------------------------
Reporter: yellowcap | Owner: yellowcap
Type: Bug | Status: new
Component: GIS | Version: 1.9
Severity: Normal | Keywords: aggregates
Triage Stage: Unreviewed | Has patch: 1
Easy pickings: 0 | UI/UX: 0
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There is an error when trying to compute a regular aggregate value from a
GIS aggregate output. To take an example from the GIS geoapp tests, the
following query fails.
{{{
from django.db.models import Sum
from django.contrib.gis.db.models.functions import Area, Intersection
Country.objects.annotate(intersum=Sum(Area(Intersection('mpoly', geom))))
}}}
I tracked this down to the `from_db_value` function in the GeometryField
class here:
https://github.com/django/django/blob/master/django/contrib/gis/db/models/fields.py#L259
The problem seems to be that the `Area` function returns a float, but the
field is expecting a value that can be converted to a Geometry.
I'll open a pull request with a regression test and a proposed solution,
basically checking if the value is a float or int.
--
Ticket URL: <https://code.djangoproject.com/ticket/26112>
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