限制Django表中的行数

问题描述

我的模型文件中有一个表，我希望对其进行设计，以使表中的行数限制为十。当超出限制时，最早的行将被删除。在某些情况下，这是为了在前端进行显示，向用户显示他们已访问的十个最新链接。我是Django新手，所以如果有人对如何执行此操作有任何建议，将不胜感激！

I have a table in my models file and I want to design it such that there is a limit to ten rows in the table. When the limit is exceeded the oldest row will be deleted. For some context this is for a display on the front end that shows a user the ten most recent links they have accessed. I am new to Django so if anyone had a suggestion on how to do this, it would be greatly appreciated!

推荐答案

编写一个自定义的 save 方法，该方法检查 YourObject.objects.all（）的长度，然后删除最旧的方法当长度等于10时。

You could write a custom save method that checks the length of YourObject.objects.all(), and then deletes the oldest one when that length is equal to 10.

类似于以下内容的行：

def save(self, *args, **kwargs):
    if YourModel.objects.count() == 10:
        objects[0].delete()

    super(YourModel, self).save(*args, **kwargs)

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