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django.contrib.gis.measure import Distance
is not a Model, it is just a class that extends MeasureBase that extends object.
class MeasureBase(object):¬
STANDARD_UNIT = None¬
ALIAS = {}¬
UNITS = {}¬
LALIAS = {}¬
So, “Why does Django think that Distance is not a valid model?” – because it isn’t a model. Models in Django are created by extending models.Model
.
Source:stackexchange.com