mysql - Django South 字段改长度后出错：FATAL ERROR

Question

在django中的一个WEELesson model 中的 desc字段，原来是200的长度，后来我觉得长了，就把max_length改成了100，原来Mysql中已有三四要记录了，使用South生成了新的Model修改文件，然后使用./manage.py migrate weelesson修改数据库时，就出现了现面的错误：

第一次遇到这情况，实在没搞懂怎么回事，麻烦大家帮帮看看。

Answer 1

I tried to reproduce the error.
When South discovered that there was data with a length greater than 100 in the desc field during the merge, it would prompt:
django.db.utils.DataError: (1265, "Data truncated for column 'XXX' at row X")

Actually, the following at row X has pointed out which record is too long, you just need to modify it yourself.