Avoid Sprockets::Helpers::RailsHelper::AssetPaths::AssetNotPrecompiledError

fix_asset_not_precompiled_error.rb

# This file monkey patches the Rails include helpers to prevent them from
# failing with an AssetNotPrecompiled error. This should be fixed in
# Rails 4.x and by then we should delete this file

module Sprockets
  module Helpers
    module RailsHelper
      alias_method :original_stylesheet_link_tag, :stylesheet_link_tag
      alias_method :original_javascript_include_tag, :javascript_include_tag
      alias_method :original_image_path, :image_path
      alias_method :original_path_to_image, :path_to_image

      def log_asset_not_found(sources, type = '')
        sources.each do |source|
          logger.warn("\n#########################################")
          logger.warn("Asset not found => #{source} #{type}")
          logger.warn("#########################################\n")
        end
      end

      def stylesheet_link_tag(*sources)
        original_stylesheet_link_tag(*sources)
      rescue Sprockets::Helpers::RailsHelper::AssetPaths::AssetNotPrecompiledError
        log_asset_not_found(sources, 'css')
        sources.map { |source|
          tag("link", { "rel" => "stylesheet", "type" => "text/css", "media" => "screen", "href" => "/assets/#{source}.css" })
        }.join("\n").html_safe
      end

      def javascript_include_tag(*sources)
        original_javascript_include_tag(*sources)
      rescue Sprockets::Helpers::RailsHelper::AssetPaths::AssetNotPrecompiledError
        log_asset_not_found(sources, 'js')
        sources.map { |source|
          "<script src=\"/assets/#{source}.js\" type=\"text/javascript\"></script>"
        }.join("\n").html_safe
      end

      def image_path(path)
        original_image_path(path)
      rescue Sprockets::Helpers::RailsHelper::AssetPaths::AssetNotPrecompiledError
        log_asset_not_found [path]
        original_image_path("/assets/#{path}")
      end
      alias_method :path_to_image, :image_path
    end
  end
end