出现这种错误是因为调用模型对象时使用了变量名，而不是对象名（模型类），例如：
user = UserInfo()
user_li = user.objects.filter(uname=username)
这种调用情况就会报此错误，解决方法是使用对象名调用objects方法
user = UserInfo()
user_li = UserInfo.objects.filter(uname=username)
django报错Manager isn't accessible via UserInfo instances
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