Rails 5 db migration: how to fix ActiveRecord::ConcurrentMigrationError

Question

A previous rake db:rollback stalled. Now when attempting a new migration we get the following error:

rake aborted!
ActiveRecord::ConcurrentMigrationError: 

         


        

Answer 1

If you're manipulating with the data in DB, not the table and column settings, maybe one time rake task is a better place for this?