Django 1.7迁移问题与我的旧项目有关

Question

I have a django 1.5 app , now I migrated it to django 1.7 and app is working fine with old database. But Now I want create migrations for that app using django 1.7.

I deleted old migrations and just kept migrations folders with __ init__ files

then I ran ./manage.py makemigrations

while running ./manage.py migrate its giving some errors.

django.db.utils.ProgrammingError: relation "django_site" does not exist
LINE 1: SELECT (1) AS "a" FROM "django_site" LIMIT 1

I have added django_sites to installed apps.

Is there any particular way to create/apply migrations when updating to native migrations?

Answer 1

you have a migration that depend on django.contrib.site but is the tables related are not available. you can

• move django.contrib.site up in the INSTALLED_APPS
• check the attribute dependencies of your migration

Anyway I think your problem is with the default value of some field.

If you don't find the involved application you can:

1. disable all the apps in the INSTALLED_APPS
2. enable the first one
3. run makemigrations
4. delete all migrations
5. enable the next application
6. run makemigrations ... repeat step 4..6 until you get the error

Answer 2

From the documentation :

If you already have pre-existing migrations created with South, then the upgrade process to use django.db.migrations is quite simple:

• Ensure all installs are fully up-to-date with their migrations.
• Remove 'south' from INSTALLED_APPS.
• Delete all your (numbered) migration files, but not the directory or init .py - make sure you remove the .pyc files too.
• Run python manage.py makemigrations. Django should see the empty migration directories and make new initial migrations in the new format. Run python manage.py migrate. Django will see that the tables for the initial migrations already exist and mark them as applied without running them.

I suspect you forgot to

find . -iname "*.pyc" | xargs rm