Add cache-buster using mtime of css and js files outside the asset pipeline

1 files changed, 6 insertions, 0 deletions

diff --git a/app/helpers/admin_helper.rb b/app/helpers/admin_helper.rb
index 08336ef..1e84620 100644
--- a/app/helpers/admin_helper.rb
+++ b/app/helpers/admin_helper.rb
@@ -8,4 +8,10 @@ module AdminHelper
       link_to raw('<span class="inactive">English</span>'), url_for(params.permit(:locale, :page_path).to_h.merge('locale' => 'de'))
     end
   end
+
+  def mtime_busted_path(path)
+    file = Rails.public_path.join(path.sub(%r{\A/}, ""))
+    raise "Static asset not found for cache-busting: #{path} (looked for #{file})" unless File.exist?(file)
+    "#{path}?v=#{File.mtime(file).to_i}"
+  end
 end