app/views/favorites/_favorite.html.erb
<td id="favorite-<%= lacquer.id %>">
<% if lacquer.favorited_by?(current_user) %>
<% favorite = Favorite.find_by(user_id: current_user.id, lacquer_id: lacquer.id) %>
<% if user_lacquer %>
<% user_lacquer_id = user_lacquer.id %>
<% else %>
<% user_lacquer_id = nil %>
<% end %>
<%= link_to "<i class='fa fa-heart'></i>".html_safe, destroy_favorite_path(:id => favorite.id, :lacquer_id => lacquer.id, :user_id => current_user.id, user_lacquer_id: user_lacquer_id), action:"destroy", method:"delete", remote: true, class: "red-heart" %>
<% else %>
<% if user_lacquer %>
<% user_lacquer_id = user_lacquer.id %>
<% else %>
<% user_lacquer_id = nil %>
<% end %>
<%= link_to "<i class='fa fa-heart-o'></i>".html_safe, new_favorite_path(:lacquer_id => lacquer.id, :user_id => current_user.id, user_lacquer_id: user_lacquer_id), action:"create", method:"post", remote: true, class: "red-heart" %>
<% end %>
</td>