本文介绍了一种强大的数据库迁移方法，可以在不删除现有数据库或丢失数据的情况下调整模型结构。通过三个步骤实现：修改 models.py 中的模型定义；运行 python manage.py makemigrations 创建迁移文件；最后运行 python manage.py migrate 应用更改。
Migrations are very powerful and let you change your models over time, as you develop your project, without the need to delete your database or tables and make new ones - it specializes in upgrading your database live, without losing data. We’ll cover them in more depth in a later part of the tutorial, but for now, remember the three-step guide to making model changes:
1)Change your models (in models.py).
2)Run python manage.py makemigrations to create migrations for those changes
3)Run python manage.py migrate to apply those changes to the database.
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