Issue with nested resource

I'm trying to use nested resources to generate links to the responses
that exist in this category.

Instead of:
It generates this:

See that extra URL Encoded slash 5 (%2F5=/5)? Why is that showing up?

Here's my code:
<ul id="ul_questions">
  <% unless @category.responses.empty? %>
       <% @category.responses.each do |response| %>
      <li><%= link_to,
edit_category_response_path([@category,response]) %></li>
    <% end %>
  <% end %>

Okay. I got it. Apparently one shouldn't pass the parameters as an
array like in form_for: