“没有名为‘django_heroku’的模块”应用程序无法在 Heroku 上启动

Question

Trying to push to the heroku server, I get this:

git push heroku master

remote: Building source:
remote:
remote: -----> Python app detected
remote:  !     Python has released a security update! Please consider upgrading to python-3.7.3
remote:        Learn More: https://devcenter.heroku.com/articles/python-runtimes
remote: -----> Installing requirements with pip
remote:
remote: -----> Downloading NLTK corpora…
remote:  !     'nltk.txt' not found, not downloading any corpora
remote:  !     Learn more: https://devcenter.heroku.com/articles/python-nltk
remote: -----> Discovering process types
remote:        Procfile declares types -> web
remote:
remote: -----> Compressing...
remote:        Done: 206.4M
remote: -----> Launching...
remote:        Released v10
remote:        https://versally.herokuapp.com/ deployed to Heroku

However, when I go to my app, it tells me there's an error. When I check in on the logs, I see this:

2019-04-30T13:22:00.633794+00:00 app[web.1]: import django_heroku
2019-04-30T13:22:00.633801+00:00 app[web.1]: ModuleNotFoundError: No module named 'django_heroku'
2019-04-30T13:22:00.634020+00:00 app[web.1]: [2019-04-30 13:22:00 +0000] [11] [INFO] Worker exiting (pid: 11)
2019-04-30T13:22:00.789044+00:00 app[web.1]: [2019-04-30 13:22:00 +0000] [4] [INFO] Shutting down: Master

I'm yet to setup the database, but I'm just looking to get a debug message from the django code so I can start with configuration of the database.

Answer 1

I ran into this issue myself and discovered the problem. This error will happen if the module cannot be found, as the name of the error explains. If the virtual environment containing the module is not included in the code pushed to heroku, then the module cannot be found.

If you are using pipenv as your virtual environment, you will get this error. To fix this, you will need to do the following:

1. Delete the Pipfile and Pipfile.lock files.

2. Outside the pipenv,issue the following commands:

python -m venv virtual_environment_name

virtual_environment_name/Scripts/Activate (Windows)

source virtual_environment_name/bin/activate (Mac)

3. Install the packages previously installed again.

4. Run the git add . and git commit -am "Some text here" commands.

You should be good to go!

Answer 2

For anyone out there with this problem, I solved it by emptying my requirements.txt, pushing (which forces Heroku to uninstall all the requirements) then pushing populated requirements through aggain.

I had to make sure gunicorn was included in requirements - which it was, but a log showed that for some reason heroku uninstalled my 'stale' version.

Heroku + gunicorn not working (bash: gunicorn: command not found )