像django的orm里定义model 时field的顺序是怎么保证的呢? - V2EX
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像django的orm里定义model 时field的顺序是怎么保证的呢?

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  •   args
    pendulm 2011-11-12 10:51:37 +08:00 6027 次点击
    这是一个创建于 5131 天前的主题,其中的信息可能已经有所发展或是发生改变。
    类似这样

    class Person(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)


    按理说这样定义的属性都会到Person的 __dict__ 对象里,这是一个字典,顺序完全没有保证的啊。不知道顺序的话,后面的插入之类的sql语句怎么实现?

    有研究过的人进来说一说嘛~
    3 条回复    1970-01-01 08:00:00 +08:00
    dreamersdw
        1
    dreamersdw  
       2011-11-12 10:58:46 +08:00
    INSERT INTO Persons (last_name, first_name) VALUES ('Tom', 'Wilson')
    iiduce
        2
    iiduce  
       2011-11-12 11:16:58 +08:00
    The dict is a sorteddict,which presents the items in the order they are added.

    https://code.djangoproject.com/wiki/SortedDict
    kaiix
        3
    kaiix  
       2011-11-12 11:39:20 +08:00
    sorteddict python的dict是不保序的 所以django用了一个list来保存顺序 见django.utils.datastructure
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