Django数据模型中on_delete使用详解
on_delete属性针对外键ForeignKey 一、django3.0官方文档介绍: Many-to-one relationships多对一关系 To define a many-to-one relationship, use django.db.models.ForeignKey. You use it just like any other Field type: by including it as a class attribute of your model. ForeignKey requires a positional argument: the class to
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