If you don't get an answer here, you can also ask on the geodjango list: https://groups.google.com/forum/#!forum/geodjango.
On Monday, December 19, 2016 at 6:59:43 AM UTC-5, Sanjay Bhangar wrote: > > Hey folks, > > I am trying to use the 'Area' function documented here: > https://docs.djangoproject.com/en/1.10/ref/contrib/gis/functions/#area to > annotate my geo queryset results with Area of the polygon geometries in my > database. > > This works great with something like: > > annotated_qset = GeoModel.objects.annotate(area=Area('geom')) > > I then have a property called 'area` which I can use and it's all great. > > However, I then try and filter by Area by following the documentation for > filtering by Length on the documentation page, so I try something like: > > filtered_qset = > GeoModel.objects.annotate(area=Area('geom')).filter(area__gt=1) > > This gives an error like "AttributeError: 'AreaField' object has no > attribute 'get_lookup". > > It makes sense that this works for the Length function since Length uses > the FloatField class, so supports lookups and filters, whereas the > AreaField does not: > https://github.com/django/django/blob/master/django/contrib/gis/db/models/sql/conversion.py#L24 > > I could be totally naive here and this may just not be a trivial thing for > the back-end (PostGIS in my case) to support, but just wondering if anyone > has any work-arounds to filter by area size of feature, and / or if there > are plans to support this in future versions. > > Thank you all again for an amazing community and amazing piece of software > :-) > > -Sanjay > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/bd72b2f9-1efb-4b68-946b-917c0b539f54%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
