Just did a cursory read of the geodjango documentation for the first
time...the querysets being returned from "all()" (or really, just objects)
need to be GeoQuerySets which have a default "position" as part of their
specification (I think), also such modules need to inherit from the geo
version of model.Model AND use a special GeoManager. So, once you use that
special manager, there is a point, boundary or area tat all the geo
functions refer to.
On Wednesday, December 12, 2012 1:15:44 PM UTC-8, mikegolf wrote:
>
> Hi,
> I've recently started learning GeoDjango and I'm a bit confused.
> There's a GeoQuerySet method "distance" which annotates each object with
> the distance to the given point, like that:
>
> pnt = 'POINT(coords... coords ...)'
> MyModel.objects.all().distance(pnt)
>
> but what field of the object does it take to calculate the distance?
> I'd like to do "classic" annotation, like that:
>
> MyModel.objects.all().annotate(distance_to_pnt =
> Distance('location_attribute_of_MyModel', pnt))
>
> any tips?
> thanks
> mg
>
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