How to remove an app from a django projects (and all its tables)

Question

I want to remove an app from a django project.

I want to remove

• the tables of the app
• the content-types
• foreign-key usages of these content-types

Running manage.py migrate app_to_remove zero does not work:

django.db.migrations.migration.IrreversibleError: 
Operation <RunPython <function forwards_func at 0x7ff76075d668>> in
            fooapp.0007_add_bar is not reversible

I guess there are several migrations which are not reversible ...

Answer 1

Note: this guide is successful with Django 3.1.1 and Python 3.8.2

Can you try this solution to clean your database and migrations first

Step 1: Delete your table from the file your_app/models.py but leave the file itself

Step 2: Check your register in the file admin.py if you have

Step 3: create migration:

manage.py makemigrations your_app

Step 4: migrate into database:

manage.py migrate

you can see the result in my example

Step 5: delete all the files in the folder your_app/migrations

Step 6: Remove migrations in the table django_migrations

python manage.py migrate --fake your_app zero

Check migrations:

python manage.py showmigrations

Step 7: Then you can remove the app completely,check reference,INSTALLED_APPS