#25313: Document how to migrate from a built-in User model to a custom User
model
-------------------------------+------------------------------------
Reporter: Carl Meyer | Owner: nobody
Type: New feature | Status: new
Component: Documentation | Version: 1.8
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Thomas Grainger):
I've used a custom management command to automate this - avoiding raw sql
by using MigrationRecorder
{{{
from __future__ import annotations
import argparse
from django.contrib.contenttypes.models import ContentType
from django.core.management import call_command
from django.core.management.base import BaseCommand
from django.db import DEFAULT_DB_ALIAS, connections
from django.db.migrations.recorder import MigrationRecorder
class Command(BaseCommand):
"""
Custom management command for forcing the django custom user migration
"""
help = "fake users.migrations.0001_initial and switch auth.User
content types to users.User if required"
def add_arguments(self, parser: argparse.ArgumentParser) -> None:
parser.add_argument(
"--database",
default=DEFAULT_DB_ALIAS,
help="Nominates a database to apply migrations for. Defaults
to the 'default' database.",
)
def handle(self, *args: object, database: object = DEFAULT_DB_ALIAS,
**options: object) -> None:
"""
fake users.migrations.0001_initial and switch auth.User content
types to users.User if required"
"""
assert isinstance(database, str)
connection = connections[database]
recorder = MigrationRecorder(connection)
recorded_migrations = recorder.applied_migrations()
if (
# not faked yet
("users", "0001_initial") not in recorded_migrations
# django auth migrations have already been applied
and ("auth", "0001_initial") in recorded_migrations
):
# https://www.caktusgroup.com/blog/2019/04/26/how-switch-
custom-django-user-model-mid-project/
recorder.record_applied(app="users", name="0001_initial")
ContentType.objects.filter(app_label="auth",
model="user").update(app_label="users")
call_command("migrate", database=database)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/25313#comment:26>
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