Column ‘createDatetime’ cannot be null
问题描述：
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问题原因：
models文件中创建createDatetime字段时未声明字段可为空
createDatetime=models.DateTimeField(auto_created=datetime.datetime.now())
解决方法：
增加blank=True参数或将字段属性改为
createDatetime=models.DateTimeField(auto_created=datetime.datetime.now(),blank=True)
createDatetime = models.DateTimeField(auto_now_add=datetime.datetime.now())