adds hide/show behaviour to comment forms

app/assets/javascripts/comments.js.coffee

@@ -0,0 +1,9 @@
+jQuery ->
+
+  toggle_comment = (id) ->
+    $("#js-comment-form-#{id}").toggle()
+
+  $('.js-add-comment-link').click ->
+    id = $(this).data().id
+    toggle_comment(id)
+    false

app/views/comments/_form.html.erb

@@ -1,7 +1,11 @@
-<%= form_for [@debate, Comment.new] do |f| %>
+<%= link_to "Comentar", "", class: "js-add-comment-link", data: {'id': parent.id} %>
+
+<div id="js-comment-form-<%= parent.id %>" style="display:none">
+  <%= form_for [@debate, Comment.new] do |f| %>
     <%= f.text_area :body %>
     <%= f.hidden_field :commentable_type, value: parent.class %>
     <%= f.hidden_field :commentable_id, value: parent.id %>
     
     <%= f.submit 'Publicar comentario' %>
-<% end %>
+  <% end %>
+</div>