Django模型递归关系 [英] Django model recursive relationship

问题描述

1. 为什么要创建递归关系?

1. Why would I create a recursive relationship?

    aField = models.ForeignKey('self')

与上述相同吗?

Is this the same with the above?

        class aClass(models.Model):  
        aField = models.ForeignKey('aClass')

推荐答案

1. 当您希望具有相同模型结构的父节点和子节点时，可能需要创建一个递归关系.例如，如果您有带有文本，数据和user_id的注释:

1. You may need to create a recursive relationship when you would like to have parent and child nodes with identical model structure. For example if you have comments with text, data and user_id:

class Comment( models.Model ):
    text = models.TextField()
    create_date_time = models.DateTimeField()
    parent_comment = models.ForeignKey( 'self' )

我认为是的(您可以尝试对其进行测试)，但这不是一个很好的形式.如果更改类名，则必须更改括号中的字符串值.如果您使用自我"，就不会感到头疼.

I think yes (you can try to test it) but it's not a good form. If you change a class name then you must change the string value in brackets. If you use 'self' you haven't this headache.

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