Relation Does Not Exist - Django & Postgres

I added some table to an existant model, but I got an error when i push my project to heroku : This happens to any models I add on this particular app ProgrammingError at /admin/

Solution 1:

This worked for me

1. heroku run bash
2. python manage.py makemigrations
3. python manage.py migrate

Solution 2:

I got the same error when landing on a template getting data from my database, after having resetted my database from Heroku dashboard.

I solved it by doing:

1. python manage.py makemigrations
2. python manage.py migrate
3. git add .
4. git push -m "upload empty database"
5. git push heroku master