关于即将到来的 Rails 5，这是目前最完整的新特性列表：What’s new in RAILS 5 ?
列举一些比较值得注意的变化：
- Rails 5 will only work on Ruby 2.2.1 and above
- Rails API merged into Rails
- Render templates outside of controller. Render from anywhere – jobs, rake tasks
- Turbolinks 3
- Action Cable
- Just use rails as the command router: having both rails and rake commands is confusing (Not yet merged)
- belongs_to will now trigger a validation error by default if the association is not present
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