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args
V2EX  ›  Python

像django的orm里定义model 时field的顺序是怎么保证的呢?

  •  
  •   args ·
    pendulm · Nov 12, 2011 · 6710 views
    This topic created in 5434 days ago, the information mentioned may be changed or developed.
    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 replies  •  1970-01-01 08:00:00 +08:00
    dreamersdw
        1
    dreamersdw  
       Nov 12, 2011
    INSERT INTO Persons (last_name, first_name) VALUES ('Tom', 'Wilson')
    iiduce
        2
    iiduce  
       Nov 12, 2011
    The dict is a sorteddict,which presents the items in the order they are added.

    https://code.djangoproject.com/wiki/SortedDict
    kaiix
        3
    kaiix  
       Nov 12, 2011
    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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