Ruby on Rails 4.2 Release Notes — Ruby on Rails GuidesHighlights in Rails 4.2: Active Job Asynchronous mails Adequate Record Web Console Foreign key support These release notes cover only the major changes. To learn about other features, bug fixes, and changes, please refer to the changelogs or check out the list of commits in the main Rails repository on GitHub. 1 Upgrading to Rails 4.2If you're upgrading an existing application, it's a great idea t
