通过选择产品上的ajax获取产品数量（Rails 4）

Question

我有2个元素：产品列表和禁用数量下拉列表。

当用户从列表中选择产品时，我想获取数量产品来更新下拉列表。

我目前的代码如下：

查看

        <%= f.label "Producto" %>
        <%= f.text_field :product_search, class: "form-control radius-top", value: '', placeholder: 'Buscar...', readonly: readonly  %>
        <%= select_tag "order_detail[product_id]", options_from_collection_for_select(@products, "id", "name"), :include_blank => 'Seleccionar producto', :class => 'form-control radius-bottom' %>

        <%= f.label "Cantidad" %>
            <%= select_tag "order_detail[quantity]", options_from_collection_for_select(@products, "id", "name"), :include_blank => '0', :class => 'form-control radius-bottom', disabled: true %>

控制器

  def new
    @order = Order.new
    @customers = Customer.all.order('name ASC')
    @products = Product.only_with_stock.order('name ASC')
    @product_details = ProductDetail.all
  end

update_quantity.js.coffee

$("#order_detail_quantity")
    .empty()
    .append("<%= escape_javascript(render(:partial => @product_details)) %>")

“＃order_detail_quantity”是数量下拉列表，但我收到了Ajax错误。

可能有什么不好？

我真的需要帮助:(

由于

更新

Product_details list partial

<div class="col-sm-9 col-sm-offset-3 col-md-10 col-md-offset-2 main">
  <h1 class="page-header">Inventario</h1>

    <%= link_to '<button type="button" class="btn btn-success"><i class="fa fa-plus"></i> Agregar</button>'.html_safe, new_product_product_detail_path(@product) %>

    <br><br>

    <% if !@product.product_details.empty? %>

        <div class="row">
            <div class="col-lg-12">
              <table class="table table-hover">
                <thead>
                  <tr>
                    <th>#</th>
                    <th>Serial</th>
                    <th></th>
                    <th class="text-center">Comentario</th>
                    <th></th>
                  </tr>
                </thead>

                <tbody>
                  <% @product.product_details.each do |product_detail| %>
                    <tr>
                      <td><%= product_detail.id %></td>
                      <td><%= link_to product_detail.serial, edit_product_product_detail_path(@product, product_detail) %></td>
                      <td class="text-center"><span class="label label-<%= product_detail.product_status.available == true ? 'success' : 'danger' %>"><%= product_detail.product_status.name %></span></td>
                      <td class="text-center"><%= product_detail.comment.empty? ? '-' : product_detail.comment %></td>
                      <td class="text-center">
                        <div class="btn-group">
                          <button type="button" class="btn btn-default btn-xs dropdown-toggle" data-toggle="dropdown">
                            <i class="fa fa-gear"></i> <span class="caret"></span>
                          </button>
                          <ul class="dropdown-menu" role="menu">
                            <li><%= link_to 'Editar', edit_product_product_detail_path(@product, product_detail) %><li>
                            <li><%= link_to 'Eliminar', [@product, product_detail], method: :delete, data: { confirm: '¿Seguro que deseas eliminar el articulo ' + product_detail.serial + '?' } %></li>
                          </ul>
                        </div>
                      </td>
                    </tr>
                  <% end %>
                </tbody>
              </table>
            </div>
        </div>

    <% else %>

        <% if @product.published == true  %>
            <div class="alert alert-danger g-margin-b-0" role="alert">¡Este producto aun no tiene inventario y esta publicado!</div>
        <% else %>
            <div class="alert alert-warning g-margin-b-0" role="alert">Este producto aun no tiene inventario...</div>
        <% end %>

    <% end %>

</div>