CODEWITHSUNDEEP
pythonflask
Joan Prat Rigol
Joan Prat Rigol

Reputation: 71

Flask Application was not able to create a URL adapter for request

I have this code which used to work:

import unittest

from flask import url_for

from dm.web import create_app, db


class TestApi(unittest.TestCase):
    def setUp(self):
        """Create and configure a new app instance for each test."""
        self.app = create_app('test')
        self.app_context = self.app.app_context()
        self.app_context.push()
        db.create_all()
        self.client = self.app.test_client(use_cookies=True)

    def tearDown(self) -> None:
        db.session.remove()
        db.drop_all()
        self.app_context.pop()

    def test_url(self):
        self.assertEqual('/', url_for('root.home'))

if __name__ == '__main__':
    unittest.main()

But since today I am getting this error:

ERROR: test_url (__main__.TestApi)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/joan/.PyCharmCE2019.3/config/scratches/scratch.py", line 17, in test_url
    self.assertEqual('/', url_for('root.home'))
  File "/home/joan/venvs/dimensigon3.7/lib/python3.7/site-packages/flask/helpers.py", line 333, in url_for
    "Application was not able to create a URL adapter for request"
RuntimeError: Application was not able to create a URL adapter for request independent URL generation. You might be able to fix this by setting the SERVER_NAME config variable.

From what I see in the url_for, I am getting None on the appctx.url_adapter which I don't know when it is set.

Thanks!

Upvotes: 7

Views: 8526

Answers (1)

Sean McCarthy
Sean McCarthy

Reputation: 5578

As per this blog post, you could try this pattern, which gives you both an app context and a temporary request context:

    def test_url(self):
        with app.app_context(), app.test_request_context():
            self.assertEqual('/', url_for('root.home'))

Upvotes: 15

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