Django 3 Web Development Cookbook - Fourth Edition

How it works...

Django migrations are instruction files for the database migration mechanism. The instruction files inform us about which database tables to create or remove, which fields to add or remove, and which data to insert, update, or delete. Also they define which migrations are dependent on which other migrations.

There are two types of migrations in Django. One is schema migration, and the other is data migration. Schema migration should be created when you add new models, or add or remove fields. Data migration should be used when you want to fill the database with some values or massively delete values from the database. Data migrations should be created by using a command in the command-line tool, and then coded in the migration ...