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Editorial Team
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Asked: 2026-05-12T14:51:51+00:00

I have 4 related migrations in my Rails app: First 3 migrations create one

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I have 4 related migrations in my Rails app:

First 3 migrations create one table each in the self.up and and drops them in their respective self.down methods.

4th migration runs a rake task that loads data to all three (in self.up). I am thinking what to put in self.down of this migration to delete the rows from the 3 tables?

Am I doing it wrong? Probably should have created one migration where I create 3 tables and load the data in self.up and just drop all three tables in the self.down method?

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  1. Editorial Team

    This is wrong!

    Migrations should be used only for migrating your Data Model not your Data.

    Rails 2.3.4 adds ‘seeds’. This is a file in db/seeds.rb contains ruby code to ‘bootstrap’ your database. This is a great way to create semi-static content for your database like categories, look-up tables or user accounts.

    You can then load the seed data with a simple rake task

    rake db:seed
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