def update(self, instance, validated_data):
request = self.get_request_or_die()
if not can_edit(request.user, instance, check_api_read_only=False):
# This branch is only entered when doing a PATCH request (partial
# update), because datalogger validation is done first.
raise PermissionDenied(_("Permission to edit Unit denied"))
elif instance.api_read_only:
raise MethodNotAllowed(request.method, _("Unit is read only"))
return super(UnitSerializer, self).update(instance, validated_data)
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