问题
So I'm rapidly iterating on a django app at the moment and I'm constantly adjusting models.py. Over the course of a day or two of programming and testing I generate a couple dozen migration files. Sometimes I really tear the schema apart and completely re-do it. This causes the migration process to complain a great deal about defaults and null values and so on. If possible, I would just like to scratch all the migration stuff and re-start the migrations now that I finally know what I'm doing. My approach thus far has been the following:
- delete everything in the migrations folder except for
__init__.py
. - drop into my PostgreSQL console and do:
DELETE FROM south_migrationhistory WHERE app_name='my_app';
- while at the PostgreSQL console, drop all of the tables associated with my_app.
- re-run
./manage.py makemigrations my_app
- this generates a0001_initial.py
file in my migrations folder. - run
./manage migrate my_app
- I expect this command to re-build all my tables, but instead it says: "No migrations to apply."
What gives?
Also, is the south_migrationhistory
database table still in play now that I've dumped South and have switched to Django 1.7?
Thanks.
回答1:
So the step-by-step plan I outlined in my question does work, but instead of deleting rows from the south_migrationhistory
database table, I had to delete rows from the django_migrations
database table.
The command is: DELETE FROM django_migrations WHERE app='my_app'
Once this is done, you will be able to re-run your migrations from scratch.
回答2:
I just wanted to put all the steps into a command format:
NOTE: The commands below are pretty destructive, it is a means to start from scratch
as the OP asked.
After a comment from mikeb
I thought to add this line:
PRE - CHECK WHAT FILES YOU WOULD DELETE
find . -path "*migrations*" -name "*.py" -not -path "*__init__*"
Then, adjust the command in step 1
to one that works for your dev environment.
- remove all the migrations from all the apps:
find . -path "*migrations*" -name "*.py" -not -path "*__init__*" -exec rm {} \; # make sure to be in your projects path
- recreate the whole database:
sudo -u postgres bash -c "psql -c \"DROP DATABASE rootedin;\""
sudo -u postgres bash -c "psql -c \"CREATE DATABASE rootedin;\""
sudo -u postgres bash -c "psql -c \"GRANT ALL PRIVILEGES ON DATABASE rootedin to vagrant;\"" # vagrant is my current user
- get your db up to date:
python3 manage.py makemigrations
python3 manage.py migrate
来源:https://stackoverflow.com/questions/26283159/django-1-7-migrations-how-do-i-clear-all-migrations-and-start-over-from-scrat