<%# collection %> <% content_for(:html_header) do %> <% if collection.try(:prev_page) %> <%= tag.link rel: "prev", href: url_for(nav_params_for(collection.prev_page)) %> <% end %> <% if collection.try(:next_page) %> <%= tag.link rel: "next", href: url_for(nav_params_for(collection.next_page)) %> <% end %> <% end %>