Have you ever mistaken one Rails environment for another? The attached helper will help you to never do it again.

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Save the attached file to app/helpers/ and use the widget in your layout like this:

%body
  = rails_env_widget unless Rails.env.production?

It'll render a small light gray box in the top left corner of your screen, containing the current Rails environment. On click, it'll disappear. Actually, it has the same UX as our Query Diet widget Show archive.org snapshot .