第一次建model时，漏了最后的括号：

title = models.TextField()

加上后出现错误：

OperationalError at /admin/blog/article/

no such column: blog_article.title

重新添加括号后，尝试    python manage.py makemigrations  但是出现如下问题：

You are trying to add a non-nullable field 'title' to article 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 with a null value for this column)

 2) Quit, and let me add a default in models.py

此时选择1）也没有解决，应该怎么解决？