[Ruby on Rails 4] group :assets do … end is Deprecated

Tadashi Shigeoka ·  Sat, February 8, 2014

Starting from Ruby on Rails 4, writing group :assets do … end in the Gemfile has been deprecated.

Ruby on Rails | ルビーオンレイルズ
Rails 4.0 removed the assets group from Gemfile. You'd need to remove that line from your Gemfile when upgrading.

Ruby on Rails Guides

Reference Information

That’s all from the Gemba.