Migrating old users into custom user model

Hello,

I have an existing project with migrations, datamigrations and I need a custom user model now, not just 1-1 profile so I created one.

However, when I switch the AUTH_USER_MODEL setting, I can't access the old auth.user model for my datamigration

def transfer_users(apps, schema_editor):

    OldUser = apps.get_model('auth', 'User')

    User = apps.get_model('users', 'User')

    for old_user in OldUser.objects.all():

        new_user = User.objects.create(

            date_joined=old_user.date_joined,

            email=old_user.email and old_user.email or '%s@example.com' % old_user.username,

            first_name=old_user.first_name,

            id=old_user.id,

            is_active=old_user.is_active,

            is_staff=old_user.is_staff,

            is_superuser=old_user.is_superuser,

            last_login=old_user.last_login,

            last_name=old_user.last_name,

            password=old_user.password)

        for perm in old_user.user_permissions.all():

            new_user.user_permissions.add(perm)

        for group in old_user.groups.all():

            new_user.groups.add(group)

class Migration(migrations.Migration):

    dependencies = [

        ('users', '0001_initial'),

        ('auth', '0006_require_contenttypes_0002'),

    ]

    operations = [

        migrations.RunPython(transfer_users)

    ]

Running this migration gives 

AttributeError: Manager isn't available; User has been swapped for 'users.User'

When trying to use OldUser.objects.all()

Is there another way to do this? Preferably in a datamigration not using a database shell

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