anchor.diff:  <div id="cart_dates">
  -  <%= form_tag url_for(action: 'update_cart'), :remote => true, :class => "form-vertical", :id => "cart_form", method: :put do %>
  +  <%= form_tag url_for(action: 'update_cart'), remote: true, class: 'form-vertical', id: 'cart_form', method: :put do %>
   
       <%= hidden_field_tag 'page', params[:page] %>
       <%# to preserve pagination %>
  
positive.code:       </div>
      <% end %>
  
        <%= label_tag :start_date, 'Start Date' %>
        <%= text_field "cart", "start_date_cart", :class => 'autosubmitme form-control date_start', :value => cart.start_date.strftime('%m/%d/%Y') %>
        <%= hidden_field_tag "cart[start_date_cart]", cart.start_date, id: 'date_start_alt' %>
  
        <%= label_tag :due_date, 'Due Date' %>
        <%= text_field "cart", "due_date_cart", :class => 'autosubmitme form-control date_end', :value => cart.due_date.strftime('%m/%d/%Y'), :minDate => cart.start_date.strftime('%m/%d/%Y') %>
        <%= hidden_field_tag "cart[due_date_cart]", cart.due_date, id: 'date_end_alt' %>
  
    <% end %>
  </div>
  
negative.code:       <%= label_tag :reserver_id, 'Reserving For' %>
        <%= hidden_field_tag 'reserver_id', cart.reserver_id %>
        <div class="input-group">
          <%= autocomplete_field_tag 'fake_reserver_id',
            cart.reserver_id == current_user.id ? '' : User.find(cart.reserver_id).render_name,
            autocomplete_user_last_name_users_path,
  