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Editorial Team
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Asked: 2026-06-04T05:11:49+00:00

Im curious how you guys visual make distinction between the different Rails modes development/test

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Im curious how you guys visual make distinction between the different Rails modes development/test and production?

Im afraid that since visually the apps look the same in each mode, my customer can use the wrong environment and enter production data in a test environment.

Now i change the background in my application CSS, to make sure there is a difference. BUt i rather would have something smart that automatically works based on the environment thats running. Maybe a BIG watermark?

Any best practices here?

Based on Artimuz answer i did the following:

Add this to the application_helper.rb

  def development?
    @is_development ||= (ENV['RAILS_ENV'] != 'production')
  end

then in application.html.erb i added:

 <head>
 <% if development? %>
    <style type="text/css">
        html {              
         background-image: url(/assets/test.png);
         background-color: silver;
        }
    </style>>   
  <% end %>
 </head>

The test.png is just a transparent png with the word ‘test’ inside and a diagonal line. Works like a charm (its tiled), for sure you you can’t miss your inside the development/test environment.

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1 Answer

  1. Editorial Team

    From here: http://markmail.org/message/grmor6rppm5jwgnh

    You can test RAILS_ENV environment variable.

    In application_helper.rb, add this method :

    def production?
  @is_production ||=(ENV['RAILS_ENV']=='production')
end

    An d in your views/layouts:

    <% if production? %>
   ...
<% end %>
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