Method assertForeignKeyExists

tests/schema/tests.py:326–339

Fail if the FK constraint on `model.Meta.db_table`.`column` to `expected_fk_table`.id doesn't exist.

(self, model, column, expected_fk_table, field="id")

        )

    def assertForeignKeyExists(self, model, column, expected_fk_table, field="id"):
        """
        Fail if the FK constraint on `model.Meta.db_table`.`column` to
        `expected_fk_table`.id doesn't exist.
        """
        if not connection.features.can_introspect_foreign_keys:
            return
        constraints = self.get_constraints(model._meta.db_table)
        constraint_fk = None
        for details in constraints.values():
            if details["columns"] == [column] and details["foreign_key"]:
                constraint_fk = details["foreign_key"]
                break
        self.assertEqual(constraint_fk, (expected_fk_table, field))

    def assertForeignKeyNotExists(self, model, column, expected_fk_table):
        if not connection.features.can_introspect_foreign_keys: