出現這種錯誤是因為調用模型對象時使用了變量名，而不是對象名（模型類），例如：
user = UserInfo()
user_li = user.objects.filter(uname=username)
這種調用情況就會報此錯誤，解決方法是使用對象名調用objects方法
user = UserInfo()
user_li = UserInfo.objects.filter(uname=username)
django報錯Manager isn't accessible via UserInfo instances
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