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I have the following migration file db\migrate\20100905201547_create_blocks.rb
How can I specifically rollback that migration file?
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Undoing Migrations You can use db:migrate:undo , this command will revert most the recent migration. You can revert back to the initial state by undoing all migrations with the db:migrate:undo:all command. You can also revert back to a specific migration by passing its name with the --to option.
You must rollback the migration (for example with bin/rails db:rollback ), edit your migration, and then run bin/rails db:migrate to run the corrected version.
rake db:rollback STEP=1 Is a way to do this, if the migration you want to rollback is the last one applied. You can substitute 1 for however many migrations you want to go back.
For example:
rake db:rollback STEP=5 Will also rollback all the migration that happened later (4, 3, 2 and also 1).
To roll back all migrations back to (and including) a target migration, use: (This corrected command was added AFTER all the comments pointing out the error in the original post)
rake db:migrate VERSION=20100905201547 In order to rollback ONLY ONE specific migration (OUT OF ORDER) use:
rake db:migrate:down VERSION=20100905201547 Note that this will NOT rollback any interceding migrations -- only the one listed. If that is not what you intended, you can safely run rake db:migrate and it will re-run only that one, skipping any others that were not previously rolled back.
And if you ever want to migrate a single migration out of order, there is also its inverse db:migrate:up:
rake db:migrate:up VERSION=20100905201547 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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