Django Unleashed

10.3 Data Migrations

The concept of a data migration is simple: it’s a migration that changes the data within the database and makes no changes to the schema.

Data migrations are strange beasts. For many websites, they’re not particularly useful, or else are applied very minimally. For instance, it may be useful to add the list of countries to your database. They certainly don’t fit the narrative of this book. However, for a project meant to teach Django, they are wonderful. From here on out, any time you use the project code available on Github, you won’t need to add data—it will already exist in the database—allowing you to focus on using/changing the code in the website to better learn Django.