CODEWITHSUNDEEP
pythondjangopostgresqldjango-migrationsdjango-2.0
mart1n
mart1n

Reputation: 6213

New Django app initial DB migrations of an existing database

I have an existing database filled with a bunch of data. I want to migrate to Django so I went ahead and created the necessary models with python manage.py inspectdb. I haven't changed anything besides removed the managed = False since I want Django to manage the tables (mistake perhaps for initial migration?).

So now that the models are ready, how can I generate the first migration file so that I can start changing the fields to generate additional migrations (renaming a field here and there). I understand python manage.py migrate will handle the creation of Django-specific models but does not actually create any migration files? Some sources indicate the first migration file should be run with --fake so it's not applied. Will the next migration files remember to run the first one as fake and only apply the next ones?

Upvotes: 3

Views: 1511

Answers (1)

Alasdair
Alasdair

Reputation: 308879

You want makemigrations to create the migrations. The migrate command applies migrations, it does not create them.

You can use the --fake-initial option so that Django does not try to create the tables that already exist. Note that --fake and --fake-initial are two different commands.

When you run migrate, the django_migrations table is updated to store the currently applied migrations. The migration files themselves are not changed. The --fake command updates the django_migrations table without running the migration. That means that if you use it incorrectly your database and django_migrations table can get out of sync, which can be difficult to fix.

Upvotes: 3

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