GeoDjango annotate distance

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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