def get_or_init_instance(self, instance_loader, row):
        """
        Either fetches an already existing instance or initializes a new one.
        """
        instance = self.get_instance(instance_loader, row)
        if instance:
            return (instance, False)
        else:
            return (self.init_instance(row), True)
Either fetches an already existing instance or initializes a new one.