rails migration reversible code example
Example 1: rails rollback multiple migrations
rake db:rollback STEP=n
# n = how many migrations you want to rollbackExample 2: rials db down
bin/rails db:migrate:down VERSION=YYYYMMDDHHMMSSrake db:rollback STEP=n
# n = how many migrations you want to rollbackbin/rails db:migrate:down VERSION=YYYYMMDDHHMMSS