python - Django staticfiles not found on Heroku (with whitenoise)

Question

This question seems to be asked several time but I can not fix it.

I deployed a django app on production with DEBUG = False. I set my allowed_host. I used {% load static from staticfiles %} to load static files. I exactly write the settings sugested by Heroku doc :

BASE_DIR = os.path.dirname(os.path.dirname(__file__))
PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))

STATIC_ROOT = os.path.join(PROJECT_ROOT, 'staticfiles')
STATIC_URL = '/static/'

STATICFILES_DIRS = (
    os.path.join(PROJECT_ROOT, 'static'),
)

STATICFILES_STORAGE = 'whitenoise.django.GzipManifestStaticFilesStorage'

BUT I got an error 500. And got this traceback (by mail)

...
`cache_name = self.clean_name(self.hashed_name(name))
 File "/app/.heroku/python/lib/python3.5/site-    packages/django/contrib/staticfiles/storage.py", line 94, in hashed_name (clean_name, self))
...
ValueError: The file ‘app/css/font.css’ could not be found with <whitenoise.django.GzipManifestStaticFilesStorage object at 0x7febf600a7f0>.`

When I run heroku run python manage.py collectstatic --noinput All seems ok :

276 static files copied to '/app/annuaire/staticfiles', 276 post-processed.

Does anyone have an idea to help me, please ?

Thanks

EDIT :

annuaire
|-- /annuaire
|-- -- /settings.py
|-- /app
|-- -- /static/...`

wsgi.py

from django.core.wsgi import get_wsgi_application
from whitenoise.django import DjangoWhiteNoise


application = get_wsgi_application()
application = DjangoWhiteNoise(application)

Answer 1

With DEBUG=False, what originals use to work does not work for me anymore.

However a fix by enabling whitenoise on MIDDLEWARE in settings.py solved it. Best to be just below SecurityMiddleware.

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware', # add this line
    #Other middleware...
]

```

According to the docs, it actually needs to be enabled in the first place.