Django 4.0.3: "Error no such table" when i add or modify models in existing apps

Using Django Mystery Errors
1

Hello everyone,

I have a problem with a function that seems simple to me from Django, which is adding or modifying a Model in an application.

To add a model in an already existing application with tables already migrated, I follow the following steps:
1 - I create the new class, after the others, in my models.py file
2 - I add the line admin.site.register(myNewModel) in admin.py
3 - I run a python manage.py makemigrations myApp and I can see my table in the text that appears.
4 - Then a python manage.py migrate myApp

Then I open my admin space of the project and I see that the new table is present, except that when I click on it I have an error page

OperationalError at/admin/myApp/myNewModel/
no such table: myApp_myNewModel

and also it is impossible to add anything in, it’s actually not created…

I have been searching for a long time and what works is to completely delete my database before launching a makemigrations/migrate but I would like to find a less radical solution.

I have Django 4.0.3 and the base is the default is in sqlite3.

Thank you in advance for your answers, do not hesitate if you need more information.

2

What output do you get from python manage.py migrate myApp?

What does python manage.py showmigrations show?

What does your new model look like?