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from django.http.response import Http404


class UpdateNonExistentMixin(object):
    """
    drf views mixin for update an non-existent object(e.g. update or create then update).
    """
    def get_object(self):
        try:
            obj = super().get_object()
        except Http404:
            # update even not exists
            if self.action in ['update', 'partial_update']:
                lookup_url_kwarg = self.lookup_url_kwarg or self.lookup_field
                obj = self.get_serializer_class().Meta.model(**{self.lookup_field: self.kwargs[lookup_url_kwarg]})
            else:
                raise Http404
        return obj