from django.db.models import Q

from .models import Team

class TeamPermissionsBackend(object):

    def authenticate(self, username=None, password=None):

        return None

    def get_team_permissions(self, user_obj, obj=None):

        """

        Returns a set of permission strings that this user has through his/her

        team memberships.

        """

        if user_obj.is_anonymous() or obj is not None: