Rails: Why does a migration require TWO steps?

Question

If I generate a migration-file, for example rails generate migration create_articles title description:text, then I have to do an additional rails db:migrate afterward.

Theoretically it could all be done with one terminal-command as well: Create table articles field:type ...

Why is the process of creating a database-table done in two steps?

What's the benefit of the two-steps approach?

To have more control over the process. Imagine you misspelled or forgot a column then you can add it to your migration file before migrating. — Erwin Schens
– Erwin Schens, Commented Sep 26, 2020 at 6:21

Spinshot · Accepted Answer · 2020-09-26 11:16:07Z

1

You can edit the migration files before running a migration.
Every migration file has a timestamp. If you are working in a team and create a branch, your migrations are in your branch at first. If you deploy your branch your migration files will be deployed aswell. Because the migration files are independent from a database, you can track what happend to the tables and also update your local database to be up to date.

answered Sep 26, 2020 at 11:16

Spinshot

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