pytest-flask-sqlalchemy
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issues with using the application factory pattern
I am using the application factory pattern as described in the flask docs: https://flask.palletsprojects.com/en/1.1.x/patterns/appfactories/ , e.g.:
def create_app():
app = Flask(__name__)
from yourapplication.model import db
db.init_app(app)
As described in the docs here, I would then do:
from yourapplication.model import db
@pytest.fixture(scope="session")
def app():
app = create_app()
return app
@pytest.fixture(scope="session")
def _db(app):
db.init_app(app)
return db
but this leads to a "RuntimeError: No application found...." in my test
_______________________ ERROR at setup of test_set_name ________________________
request = <SubRequest '_transaction' for <Function test_set_name>>
_db = <SQLAlchemy engine=None>
mocker = <pytest_mock.plugin.MockFixture object at 0x7f98a6919be0>
@pytest.fixture(scope='function')
def _transaction(request, _db, mocker):
'''
Create a transactional context for tests to run in.
'''
# Start a transaction
> connection = _db.engine.connect()
.venv/lib64/python3.8/site-packages/pytest_flask_sqlalchemy/fixtures.py:31:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.venv/lib64/python3.8/site-packages/flask_sqlalchemy/__init__.py:943: in engine
return self.get_engine()
.venv/lib64/python3.8/site-packages/flask_sqlalchemy/__init__.py:952: in get_engine
app = self.get_app(app)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
self = <SQLAlchemy engine=None>, reference_app = None
def get_app(self, reference_app=None):
"""Helper method that implements the logic to look up an
application."""
if reference_app is not None:
return reference_app
if current_app:
return current_app._get_current_object()
if self.app is not None:
return self.app
> raise RuntimeError(
'No application found. Either work inside a view function or push'
' an application context. See'
' http://flask-sqlalchemy.pocoo.org/contexts/.'
)
E RuntimeError: No application found. Either work inside a view function or push an application context. See http://flask-sqlalchemy.pocoo.org/contexts/.
.venv/lib64/python3.8/site-packages/flask_sqlalchemy/__init__.py:987: RuntimeError
This also gives the same error:
@pytest.fixture(scope="session")
def _db(app):
db = SQLAlchemy()
db.init_app(app)
return db
But this works:
@pytest.fixture(scope="session")
def _db(app):
db = SQLAlchemy(app=app)
db.init_app(app)
return db
The "db.init_app(app)" is double, but it shows, that this statement does not acutally do something bad.
How do I correctly use this and why is the "init_app" different?
I have the same problem. But for me even the solution presented by @sebastianelsner does not work.