Ruby on Rails 5.1 Release Notes — Ruby on Rails Guides
Ruby on Rails 5.1 Release NotesHighlights in Rails 5.1: Yarn Support Optional Webpack support jQuery no longer a default dependency System tests Encrypted secrets Parameterized mailers Direct & resolved routes Unification of form_for and form_tag into form_with These release notes cover only the major changes. To learn about various bug fixes and changes, please refer to the changelogs or check out the list of commits in the main Rails repository on GitHub.| Ruby on Rails Guides
