def save(self, *args, **kwargs):
"""Save user object and update ``last_login`` field"""
if hasattr(self, 'backend'):
backend = self.backend
del(self.backend)
else:
backend = None
if hasattr(self, 'last_login') and type(self.last_login) == datetime:
from django.conf import settings
self.last_login = self.last_login.strftime(settings.DATETIME_FMT)
Document.save(self, *args, **kwargs)
if backend:
self.backend = backend
