shortcuts.py 文件源码

def incr_and_update_instance(instance, **fields):
    if not fields:
        return
    updates = {}
    for f, v in fields.items():
        setattr(instance, f, getattr(instance, f) + v)
        updates[f] = F(f) + v
    instance._default_manager.filter(pk=instance.pk).update(**updates)