To reverse all migrations for an app, you can run:

python manage.py migrate my_app zero

To remove directories, run
git clean -f -d or git clean -fd

To remove ignored files, run
git clean -f -X or git clean -fX

To remove ignored and non-ignored files, run
git clean -f -x or git clean -fx

pip install -e /path/to/package

mysql> SET foreign_key_checks = 0;
mysql> drop table photologue_gallery;
mysql> drop table photologue_photo;
mysql> SET foreign_key_checks = 1;

Issues:

I want to recreate the migrations, so I deleted files under migrations folder, and drop the database. And try this python manage.py makemigrations, it reponse No changes detected.

Fix:

Create the database again, and clear files and folders under migrations, then try the following:

1. python manage.py makemigrations --empty appname
2. python manage.py makemigrations
3. python manage.py migrate

It works!