django 报错'NoneType' object has no attribute 'strftime'
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django 报错'NoneType' object has no attribute 'strftime'
【现象】models.py 中原来使用的是models.DateField，导致页面显示的只有日期，没有时间，排序混乱
修改models.py文件后，
【报错】'NoneType' object has no attribute 'strftime'
【原因】没有使用命令python manage.py makemigrations 和命令python manage.py migrate重新生成数据库表
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