Django 1.8, syncdb not working, throwing a foreign

问题:

Since I upgrade to Django 1.8 from 1.7, I have got this foreign key constraint error.

File "c:project\env\lib\site-packages\mysql_python-1.2.5-py2.7-win32.egg/MySQLdb\connections.py line 36, in defaulterrorhandler raise errorclass, errorvalue, 

Django.db.utils.IntergrityError: 'Cannot add foreing key contraint

What's some wrong with django 1.8 (latest version)?

回答1:

Try this

DATABASES = {
'default': {
    ...         
    'OPTIONS': {
         "init_command": "SET foreign_key_checks = 0;",
    },
    'STORAGE_ENGINE': 'MyISAM / INNODB / ETC'
 }
}

回答2:

Have you created migrations for all your apps? If not, you may well be hitting the problem that the database tables are being created in the wrong order, which will give you this error.

If you have an existing Django 1.7 project, then you need to create the initial migration files, and then fake the initial migration, as described here

https://docs.djangoproject.com/en/1.8/topics/migrations/#adding-migrations-to-apps

Create the migration with

$ python manage.py make migrations your_app_label

And then fake the application

$  python manage.py migrate --fake-initial your_app_label