查看 migrate 具体执行的 SQL

18 May 2020

rails
sql

require './db/migrate/20160102210050_create_items'

ActiveRecord::Base.connection.transaction do
  CreateItems.new.migrate :up
  raise ActiveRecord::Rollback
end

或者是 rails c --sandbox

CreateItems.new.migrate :up

https://stackoverflow.com/questions/15852872/show-sql-generated-by-pending-migrations-in-rails-without-updating-the-database