I have a model with a field called 'geom' that is a MultiPolygonField. When
I query for instances of the model, I'd like the data in this field to
follow the right hand rule. Because I am using PostGIS on the back end, I
have support for ForceRHR (I am using Django 2.06), but I can't figure out
how to use it.
In views.py, I get a URL request with name value pairs, and I convert that
dictionary into a dictionary suitable for use in a filter:
def field_datasets(request):
client_name = 'MSFF'
grower = Growers.objects.filter(name__exact=client_name).get()
fields = serialize('geojson',
Fields.objects.filter(grower__exact=grower.id).filter(
Q(*[(k,v)for k,vs in request.GET.lists() for v in vs], _connector=Q.OR)
))
return HttpResponse(fields, content_type='json'
I've tried this:
...
test = Fields.objects.filter(grower__exact=grower.id).filter(
Q(*[(k,v)for k,vs in request.GET.lists() for v in vs], _connector=Q.OR)
)
test.update(geom = ForceRHR('geom'))
fields = serialize('geojson', test)
...
and I've tried this:
...
test = Fields.objects.filter(grower__exact=grower.id).filter(
Q(*[(k,v)for k,vs in request.GET.lists() for v in vs], _connector=Q.OR)
)
for item in test:
rhr_geom = ForceRHR(item.geom)
test[item].geom = rhr_geom
fields = serialize('geojson', test)
...
The documentation says:
Accepts a single geographic field or expression and returns a modified
version of the polygon/multipolygon in which all exterior rings are
oriented clockwise and all interior rings are oriented counterclockwise.
Non-polygonal geometries are returned unchanged.
So how else do you pass a geographic field?
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