普通にsaveすると以下のようになぜRollbackしているか分からない。
（lessonは任意のオブジェクト）
2.4.1 :019 > lesson.save (0.2ms) BEGIN Lesson Exists (0.3ms) SELECT 1 AS one FROM `lessons` WHERE `lessons`.`major_no` = 500 AND `lessons`.`course_id` = 11 LIMIT 1 (0.3ms) ROLLBACK => false 2.4.1 :020 >
だけどsave!として、!をつけるとエラー内容が表示される。
今回の場合は、titleカラムが空白なのでエラーになっていた。
2.4.1 :022 > lesson.save! (0.2ms) BEGIN Lesson Exists (0.5ms) SELECT 1 AS one FROM `lessons` WHERE `lessons`.`major_no` = 500 AND `lessons`.`course_id` = 11 LIMIT 1 (0.1ms) ROLLBACK ActiveRecord::RecordInvalid: Validation failed: Content can't be blank, Title can't be blank from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/validations.rb:78:in `raise_validation_error' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/validations.rb:50:in `save!' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/attribute_methods/dirty.rb:30:in `save!' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/transactions.rb:324:in `block in save!' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/transactions.rb:395:in `block in with_transaction_returning_status' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `block in transaction' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/transaction.rb:189:in `within_new_transaction' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `transaction' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/transactions.rb:211:in `transaction' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/transactions.rb:392:in `with_transaction_returning_status' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/transactions.rb:324:in `save!' from /usr/local/rvm/gems/ruby-2.4.1/gems/activerecord-5.0.7/lib/active_record/suppressor.rb:45:in `save!' from (irb):22 from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.0.7/lib/rails/commands/console.rb:65:in `start' from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.0.7/lib/rails/commands/console_helper.rb:9:in `start' from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.0.7/lib/rails/commands/commands_tasks.rb:78:in `console' from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.0.7/lib/rails/commands/commands_tasks.rb:49:in `run_command!' from /usr/local/rvm/gems/ruby-2.4.1/gems/railties-5.0.7/lib/rails/commands.rb:18:in `' from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:293:in `require' from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:293:in `block in require' from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:259:in `load_dependency' from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:293:in `require' from /home/ec2-user/environment/koooza/bin/rails:9:in ` ' from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:287:in `load' from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:287:in `block in load' from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:259:in `load_dependency' from /usr/local/rvm/gems/ruby-2.4.1/gems/activesupport-5.0.7/lib/active_support/dependencies.rb:287:in `load' from /usr/local/rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require' from -e:1:in ` ' 2.4.1 :023 >
save時にrollbackする際は、試してみてもよいかも。