dependencies: cap flask-sqlalchemy < 2.5
dependencies: cap flask-sqlalchemy < 2.5

Otherwise experience this breaking change:

self = <flask_sqlalchemy._EngineConnector object at 0x7f80aafb65c0>, sa_url = postgresql+psycopg2://invenio:***@localhost:5432/invenio, echo = False

    def get_options(self, sa_url, echo):
        options = {}

        options = self._sa.apply_pool_defaults(self._app, options)
>       sa_url, options = self._sa.apply_driver_hacks(self._app, sa_url, options)
E       TypeError: 'NoneType' object is not iterable

.venv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py:608: TypeError

inveniosoftware/invenio-db,inveniosoftware/invenio-db