def activate_organizations(self, user):
        """
        Activates the related organizations for the user.

        It only activates the related organizations by model type - that is, if
        there are multiple types of organizations then only organizations in
        the provided model class are activated.
        """
        try:
            relation_name = self.org_model().user_relation_name
        except TypeError:
            # No org_model specified, raises a TypeError because NoneType is
            # not callable. This the most sensible default:
            relation_name = "organizations_organization"
        organization_set = getattr(user, relation_name)
        for org in organization_set.filter(is_active=False):
            org.is_active = True
            org.save()
Activates the related organizations for the user.

        It only activates the related organizations by model type - that is, if
        there are multiple types of organizations then only organizations in
        the provided model class are activated.