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ruby-on-railsrubymigration

Run a single migration file

Is there an easy way to run a single migration? I don't want to migrate to a certain version I just want to run a specific one.

Solution

  • You can just run the code directly out of the ruby file:

    rails console
>> require "db/migrate/20090408054532_add_foos.rb"
>> AddFoos.new.up

    Note: Very old versions of rails may require AddFoos.up rather than AddFoos.new.up. If your migration has a "change" method, you need to run AddFoos.new.change.

    An alternative way (without IRB) which relies on the fact that require returns an array of class names:

    script/runner 'require("db/migrate/20090408054532_add_foos.rb").first.constantize.up'

    Note that if you do this, it won't update the schema_migrations table, but it seems like that's what you want anyway.

    Additionally, if it can't find the file you may need to use require("./db/..." or try require_relative depending on your working directory