Custom user models and South

问题:

I'm trying to use a custom user model in the most basic way, extending AbstractUser as described at Extending Django’s default User. But, I'm not sure how to properly make this work with South. I'm running into a problem when doing an initial schema migration with Here's what happening:

• I've got my extended user class, Player, in my class tournaments, which is enabled in settings.INSTALLED_APPS.

• To perform an initial syncdb, the tournaments app must be enabled. Otherwise I get this error:

  $ ./manage.py syncdb
  CommandError: One or more models did not validate:
  auth.user: Model has been swapped out for 'tournaments.Player' which has not been installed or is abstract.
  admin.logentry: 'user' has a relation with model tournaments.Player, which has either not been installed or is abstract.
  

• So, I enable the tournaments app that has my Player (custom user) model. But then, upon the initial migration:

  $ ./manage.py schemamigration tournaments --initial 
  ...
  $ ./manage.py migrate tournaments
  Running migrations for tournaments:
   - Migrating forwards to 0001_initial.
   > tournaments:0001_initial
  FATAL ERROR - The following SQL query failed: CREATE TABLE "tournaments_player" ("id" serial NOT NULL PRIMARY KEY, "password" varchar(128) NOT NULL, "last_login" timestamp with time zone NOT NULL, "is_superuser" boolean NOT NULL, "username" varchar(30) NOT NULL UNIQUE, "first_name" varchar(30) NOT NULL, "last_name" varchar(30) NOT NULL, "email" varchar(75) NOT NULL, "is_staff" boolean NOT NULL, "is_active" boolean NOT NULL, "date_joined" timestamp with time zone NOT NULL, "bio" text NOT NULL);
  The error was: relation "tournaments_player" already exists
  
  Error in migration: tournaments:0001_initial
  DatabaseError: relation "tournaments_player" already exists
  

If I skip the syncdb, I get this error, because syncdb is necessary to bootstrap South:

$ ./manage.py migrate tournaments
DatabaseError: relation "south_migrationhistory" does not exist
LINE 1: ...gration", "south_migrationhistory"."applied" FROM "south_mig...

So, it appears that I've got a chicken/egg situation here: I can't syncdb without my user model. But, if I syncdb with my user model, I can't perform an initial migration!

What is the best way to get around this? I've got some ideas, like running the initial syncdb without django.contrib.auth and django.contrib.admin enabled, or running the initial syncdb without south enabled and then converting the app. Both options seem hackey and strange.

回答1:

Try running ./manage.py migrate tournaments --fake 0001. This will add an entry into the south migration history saying that the initial migration has run, without actually executing the SQL. Alternatively, you can set class Meta: managed = False on the custom user object to tell django not to ever syncdb that model.

回答2:

This worked:

• Comment django.contrib.auth, django.contrib.admin and tournament (the app with my custom user model in settings.INSTALLED_APPS.
• manage.py syncdb
• Uncomment django.contrib.auth, django.contrib.admin and tournament
• manage.py schemamigration tournaments --initial
• manage.py syncdb
• manage.py migrate tournaments

Quite hackey and terrible. Would love to know a better way.

回答3:

I'm having the exact same problem, but I get the CommandError: even when I have my app in my INSTALLED_APPS, and uninstalled South. I did find a ticket on South for this, #1179, here. An anonymous poster had a similar work around as Thomas but a bit more complex. They do say that it is an issue with South and not Django, but I don't see how being I have uninstalled South, removed it from my INSTALLED_APPS and I still have the exact same error.

@dimadima It looks like Thomas' answer helped you but could you tell me which way worked for you and maybe accept his answer by clicking the check mark?