-diff_file=viewer.diff_file-url=url_for(params.merge(action: :diff_for_path,old_path: diff_file.old_path,new_path: diff_file.new_path,file_identifier: diff_file.file_identifier)).nothing-here-block.diff-collapsed{data: {diff_for_path: url}} This diff is collapsed.%a.click-to-expand Click to expand it.