class Admin::ChangesController

def render_field_diff(version, field, old_val, new_val)
  diff_html = Diffy::Diff.new(old_val, new_val, context: 1).to_s(:html)
  label = version.item_type == 'Page' ? field : label_for_version(version)
  "<h2>#{label.humanize.titleize}</h2>#{diff_html}"
end