Django object permission backend, that passesthrough

objectperms.py

from django.conf import settings

class ObjectPermBackend(object):
    """Simple object permission backend that passesthrough the has_perm calls
    to the object.
    
    """
    supports_object_permissions = True
    supports_anonymous_user = True
    
    def authenticate(self, username, password): #@UnusedVariable
        """Stub authenticate, do nothing."""
        return None

    def has_perm(self, user, perm, obj=None):
        """Passes the has_perm call to object.
        
        :param user: User object
        :param perm: Permission string
        :param obj: Object
        
        """
        
        if hasattr(obj, "has_perm"):
            return obj.has_perm(user, perm)
        
        return False

Usage in settings.py:

AUTHENTICATION_BACKENDS = (
    'django.contrib.auth.backends.ModelBackend',
    'objectperms.ObjectPermBackend',
)

Notice that this does not affect the normal ModelBackend when used like this.