def postgis_version(self):
        return self._get_postgis_func('postgis_version')
Trying to change a read-only foreign key should result in a 400 error.
dataset/ETHPy150Open django/django/django/contrib/gis/db/backends/postgis/operations.py/PostGISOperations.postgis_version--crossover with--dataset/ETHPy150Open mozilla/moztrap/tests/case/api/crud.py/ApiCrudCases.test_change_fk_should_error