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sprockets - precompiling a standalone asset

One way to do this is to add an initializer that generates the compiled versions directly.

  1. Add your js file to a subfolder in /app/assets/javascripts. Don't include this in application.js so it isn't added to the compiled assets.
  2. Create an initializer in /config/initializers that uses uglify directly

    output_file = "#{Rails.root}/public/public_script.js"

    input_file = "#{Rails.root}/app/assets/javascripts/non_digest/public_script.js"

    uglified = Uglifier.compile(, 'w') {|f| f.write(uglified) }

  3. Include the public js file (in this example: /public/public_script.js) in your application layout

This way you have direct access to make custom changes to how uglify handles your js and the location of the file never changes for your external services accessing them.

I did all this locally and tested that it worked using the beta version of Rails 4.2

Categories : Ruby On Rails

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