Rails 5 silences assets logs in dev mode by default

Midhun Krishna

By Midhun Krishna

on September 2, 2016

This blog is part of our  Rails 5 series.

As a Rails developer, it was a familiar sign to see assets logs flooding the whole terminal in development mode.

1Started GET "/assets/application.self-4a04ce68c5ebf2d39fba46316802f17d0a73fadc4d2da50a138d7a4bf2d26a84.css?body=1" for at 2016-09-02 10:23:04 +0530
2Started GET "/assets/bootstrap/transition.self-6ad2488465135ab731a045a8ebbe3ea2fc501aed286042496eda1664fdd07ba9.js?body=1" for at 2016-09-02 10:23:04 +0530
3Started GET "/assets/bootstrap/collapse.self-2eb697f62b587bb786ff940d82dd4be88cdeeaf13ca128e3da3850c5fcaec301.js?body=1" for at 2016-09-02 10:23:04 +0530
4Started GET "/assets/jquery_ujs.self-e87806d0cf4489aeb1bb7288016024e8de67fd18db693fe026fe3907581e53cd.js?body=1" for at 2016-09-02 10:23:04 +0530
5Started GET "/assets/jquery.self-660adc51e0224b731d29f575a6f1ec167ba08ad06ed5deca4f1e8654c135bf4c.js?body=1" for at 2016-09-02 10:23:04 +0530

Fortunately, we could include quiet_assets gem in our application. It turns off the Rails asset pipeline log in development mode.

1Started GET "/assets/application.js" for at 2016-08-28 19:35:34

quiet_assets is part of Rails 5

Now quiet_assets gem is folded into Rails 5 itself.

A new configuration config.assets.quiet which when set to true, loads a rack middleware named Sprockets::Rails::QuietAssets. This middleware checks whether the current request matches assets prefix path and if it does, it silences that request.

This eliminates the need to add external gem for this.

By default, config.assets.quiet is set to true in development mode. So we don't have to do anything. It just works out of the box.

Compatibility with older versions of Rails

This functionality has been backported to sprockets-rails 3.1.0 and is available in Rails 4.2.7 as well.

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