<% if current user %>
<% @user_favorites = current_user.fav_photos %>
<% @photos.each do |photo| %>
  <li>
    <%= link_to photo.name, photo_path(photo) %>
    <% if @user_favorites.include?(photo) %>
        <%= 'is favorite' %>
    <% end %>
  </li>
<% end %>
<% end %>