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# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.apps import apps
from django.conf import settings
from django.core import checks
def check_user_model(**kwargs):
errors = []
cls = apps.get_model(settings.AUTH_USER_MODEL)
# Check that REQUIRED_FIELDS is a list
if not isinstance(cls.REQUIRED_FIELDS, (list, tuple)):
errors.append(
checks.Error(
"'REQUIRED_FIELDS' must be a list or tuple.",
hint=None,
obj=cls,
id='auth.E001',
)
)
# Check that the USERNAME FIELD isn't included in REQUIRED_FIELDS.
if cls.USERNAME_FIELD in cls.REQUIRED_FIELDS:
errors.append(
checks.Error(
("The field named as the 'USERNAME_FIELD' "
"for a custom user model must not be included in 'REQUIRED_FIELDS'."),
hint=None,
obj=cls,
id='auth.E002',
)
)
# Check that the username field is unique
if not cls._meta.get_field(cls.USERNAME_FIELD).unique:
if (settings.AUTHENTICATION_BACKENDS ==
['django.contrib.auth.backends.ModelBackend']):
errors.append(
checks.Error(
"'%s.%s' must be unique because it is named as the 'USERNAME_FIELD'." % (
cls._meta.object_name, cls.USERNAME_FIELD
),
hint=None,
obj=cls,
id='auth.E003',
)
)
else:
errors.append(
checks.Warning(
"'%s.%s' is named as the 'USERNAME_FIELD', but it is not unique." % (
cls._meta.object_name, cls.USERNAME_FIELD
),
hint=('Ensure that your authentication backend(s) can handle '
'non-unique usernames.'),
obj=cls,
id='auth.W004',
)
)
return errors
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