Sprockets preprocessor for asset paths

application-9f8b759dfbefae75069a6cefd9d13932.css

body{background-image:url("/assets/background-0539f790ccc171714d5ad38f5524423e.jpg")}

application.css

body
{
  background-image: url('/assets/background.jpg');
}

asset_path_preprocessor.rb

class AssetPathPreprocessor < Sprockets::Processor
  def evaluate(context, locals)
    data.gsub(%r{["|']/assets/(.+)["|']}) do
      '"' + context.asset_path($1) + '"'
    end
  end
end

initializer.rb

require 'asset_path_preprocessor'

Rails.application.assets.register_preprocessor('application/javascript', AssetPathPreprocessor)
Rails.application.assets.register_preprocessor('text/css', AssetPathPreprocessor)