[RAILS] Note how to rollback Mysql deployed on Heroku


Create and deploy an app with RubyOnRails. Make a note of the beta date reset after running the migration file on Heroku.

● Check environment variables from error messages

Execute command

$ heroku run rake db:migrate:reset!

Error screen エラー画面

● Add the confirmed environment variable DISABLE_DATABASE_ENVIRONMENT_CHECK = 1 and drop the database.

Execute command

$ RAILS_ENV=production DISABLE_DATABASE_ENVIRONMENT_CHECK=1 bundle exec rake db:drop

After execution スクリーンショット 2020-10-28 16.09.06.png

● Regeneration

Execute command

Database generation
$ heroku run rails db:create

Perform migration
$ heroku run rake db:migrate


[Rails5] heroku db: from reset to migrate Rails 5 production doesn't allow rake db: drop, normally

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