def remove(self, elem):
        """Remove a requirement.

        :param elem: a string or :class:`Requirement` instance.
        """
        if isinstance(elem, text_type):
            for requirement in self:
                if requirement.package == elem:
                    return super(Requirements, self).remove(requirement)
        return super(Requirements, self).remove(elem)
def deactivate(cls):
        """
        Syntax sugar, return to public schema

        Usage:
            test_tenant.deactivate()
            # or simpler
            Tenant.deactivate()
        """
        connection = connections[get_tenant_database_alias()]
        connection.set_schema_to_public()