rails revert last migration code example

Example 1: rails rollback multiple migrations

rake db:rollback STEP=n 
# n = how many migrations you want to rollback

Example 2: rials db down

bin/rails db:migrate:down VERSION=YYYYMMDDHHMMSS

Example 3: rails db:rollback

rake db:rollback VERSION=n
# n = the version you want to rollback to