Django 之ModelForm

1.Form表单的回顾

    Model
        - 数据库操作
        - 验证
        class A(MOdel):
            user = 
            email = 
            pwd = 

    Form
        - class LoginForm(Form): 
            email = fields.EmailField()
            user = 
            pwd = 

        - is_valid -> 每一个字段进行正则(字段内置正则)+clean_字段 -> clean(__all__)  -> _post_clean
        - cleand_data
        - error

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