Please give Rails 5.0 a try on your app. Spotting bugs and upgrade issues ahead helps big releases like this.

This week 54 people contributed to Rails. We also got 10 first time contributors. Welcome aboard folks and keep it going!

All aboard! The next train is leaving to Kansas City. Don't miss it! Tickets sales ends April 3rd.

Rails 5 will only support versions of PostgreSQL greater than or equal to 9.1. Older versions are no longer supported by the PostgreSQL team. You can read more on their official page.

A default config has been added for Puma. It sets the default Puma thread count to 5 to mach Active Record's default, and prevent connection timeout errors.
Puma can now be skipped when generating new apps with the --skip-puma option.

Just like in Rails apps, it is now possible to use the rails command to execute rake tasks in Engines.

This makes Active Record aware that a database was rolled back when a before_commit callback raises an exception.
Before, Active Record would think the connection was active, and fail.