小编JR *_*uez的帖子

嗨，这是我在 models.py 中添加的特定行

billingMonth2 = models.DateTimeField()

这就是 makemigrations 中发生的事情，我想我添加了一个不可为空的字段，所以我尝试定义一个默认值：

    You are trying to add a non-nullable field 'billingMonth' to bills 
    without a default; we can't do that (the database needs something to populate
    existing rows).
    Please select a fix:
    1) Provide a one-off default now (will be set on all existing rows)
    2) Quit, and let me add a default in models.py
    Select an option: 1
    Please enter the default value now, as valid Python
    The datetime and django.utils.timezone modules …