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django Form,BoundField, ModelForm Field与Form Field类型映射变换 源码分析

django middleware 中间件原理概念，源码解读分析

vscode debug django，at changed reloading popup the message "python SystemExit 3"

comment=models.ForeignKey(‘self’, on_delete=models.CASCADE,default=0) 修改default=None。 删除最新migrations记录，重新makemigrations。 参考https://blog.youkuaiyun.com/weixin_33859504/article/details/94456759

You are trying to add a non-nullable field You are trying to add a non-nullable field 'cat' to archive without a default; we can't do that (the database needs something to populate existing rows). Please select a fix: 1) Provide a one-off default now (wil