How to delete migration files in Rails 3

 

I would like to remove/delete a migration file. How would I go about doing that? I know there are similar questions on here but as an update, is there a better way than doing script/destroy?

Also, should I do a db:reset or db:drop if I remove/delete a migration?

I usually:

  • Perform a rake db:migrate VERSION=XXX on all environments, to the version before the one I want to delete.
  • Delete the migration file manually.
  • If there are pending migrations (ie, the migration I removed was not the last one), I just perform a new rake db:migrate again.

    • If your application is already on production or staging, it's safer to just write another migration that destroys your table or columns.

    Another great reference for migrations is: http://guides.rubyonrails.org/migrations.html

    Another way to delete the migration: 

    $ rails d migration SameMigrationNameAsUsedToGenerate

    Use it before rake db:migrate is executed because changes in database will stay forever :) - or remove changes manually

    Run below commands from app's home directory:

  • rake db:migrate:down VERSION="20140311142212" (here version is the timestamp prepended by rails when migration was created. This action will revert DB changes due to this migration)

  • Run "rails destroy migration migration_name" (migration_name is the one use chose while creating migration. Remove " timestamp_ " from your migration file name to get it)

    • 链接地址: http://www.djcxy.com/p/56896.html

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