Script to restore the username hashes off django-email-as-usernames after ./manage.py dumpdata/loaddata

restore_username_hashes.py

from django.core.management import setup_environ
import settings
setup_environ(settings)
######################################################################################

from django.contrib.auth.models import User
from django.core.validators import email_re
from emailusernames.utils import _email_to_username as create_username_hash_from_email


def is_email(email):
    return bool(email_re.match(email))


def migrate_user(user):
    user.username = create_username_hash_from_email(user.email)
    user.save()


print 'Initiating migration process:'

for user in User.objects.all():

    if not user.email:
        print 'WARNING: User #%d does not have an email address. Skipping.' % user.pk

    elif not user.username:
        print 'WARNING: User #%d does not have a username. Skipping.' % user.pk

    elif not is_email(user.username):
        print 'User #%d does not have an email as his username (%s). Skipping.' % (user.pk, user.username)

    else:
        migrate_user(user)
        print 'Migrated %s -> %s' % (user.username, user.email)


print 'Migration complete.\n'