AJAX调用不能在Ruby on rails上工作

我正在学习本书“使用rails，4th edtion进行敏捷web开发”一书中的ruby。我使用rails 3.2和ruby 1.9.2。AJAX调用不能在Ruby on rails上工作

我尝试使用下面的代码，以使该卡的AJAX函数的调用

<%= button_to 'Add to Cart', line_items_path(product_id: product) , remote: true %>

然后在控制器的“创造”的操作方法为LINE_ITEM添加

respond_to do |format| 
     if @line_item.save 
     # format.html { redirect_to @line_item.cart,notice: 'Line item was successfully created.' } 
     format.html { redirect_to store_url } 
     format.js

然后创建create.js.erb文件在line_items视图中添加内容

$('#cart').html("<%=j render @cart %>");

Th E“购物车”部分是

<div class="cart_title">Your Cart</div> 
<table> 
    <%= render(cart.line_items) %> 

    <tr class="total_line"> 
    <td colspan="2">Total</td> 
    <td class="total_cell"><%= number_to_currency(cart.total_price) %></td> 
    </tr> 
</table> 
    <%= button_to 'Empty cart', cart, method: :delete, confirm: 'Are you sure?' %>

的“LINE_ITEM”部分是

<tr> 

    <td><%= line_item.quantity %>&times;</td> 
    <td><%= line_item.product.title %></td> 
    <td class="item_price"><%= number_to_currency(line_item.total_price) %></td> 
</tr>

现在，当我与页，购物车内容更新的普通刷新运行这个和它工作正常，但当我使用上面显示的“添加到购物车”按钮来执行它，它会触发一个AJAX调用，并且看起来控件没有到达create.js.erb文件或“line_items”部分。当我在开发日志中看到时，我看到以下消息。

Started POST "/line_items?product_id=1" for 127.0.0.1 at 2012-07-24 22:04:24 +0530 
Processing by LineItemsController#create as JS 
    Parameters: {"authenticity_token"=>"+8jnhCPyLhj26JDuaP1LRUNhVGGlOpFyJcfVXoffX+U=", "product_id"=>"1"} 
    [1m[35mCart Load (0.2ms)[0m SELECT "carts".* FROM "carts" WHERE "carts"."id" = ? LIMIT 1 [["id", 14]] 
    [1m[36mProduct Load (0.1ms)[0m [1mSELECT "products".* FROM "products" WHERE "products"."id" = ? LIMIT 1[0m [["id", "1"]] 
    [1m[35mLineItem Load (0.3ms)[0m SELECT "line_items".* FROM "line_items" WHERE "line_items"."cart_id" = 14 AND "line_items"."product_id" = 1 LIMIT 1 
    [1m[36m (0.1ms)[0m [1mbegin transaction[0m 
    [1m[35m (0.8ms)[0m UPDATE "line_items" SET "quantity" = 18, "updated_at" = '2012-07-24 16:34:24.620944' WHERE "line_items"."id" = 40 
    [1m[36m (12.1ms)[0m [1mcommit transaction[0m 
    [1m[35mLineItem Load (0.2ms)[0m SELECT "line_items".* FROM "line_items" WHERE "line_items"."cart_id" = 14 
    [1m[36mProduct Load (0.2ms)[0m [1mSELECT "products".* FROM "products" WHERE "products"."id" = 1 LIMIT 1[0m 
    Rendered line_items/_line_item.html.erb (5.3ms) 
    Rendered carts/_cart.html.erb (7.2ms) 
    Rendered line_items/create.js.erb (8.4ms) 
Completed 500 Internal Server Error in 30ms 

ActionView::Template::Error (undefined method `title' for nil:NilClass): 
    1: <tr> 
    2: 
    3: <td><%= line_item.quantity %>&times;</td> 
    4: <td><%= line_item.product.title %></td> 
    5: <td class="item_price"><%= number_to_currency(line_item.total_price) %></td> 
    6: </tr> 
    7: <!-- <%= debug(line_item) %> --> 
    app/views/line_items/_line_item.html.erb:4:in `_app_views_line_items__line_item_html_erb__4463614436040447986_70300167607120' 
    app/views/carts/_cart.html.erb:3:in `_app_views_carts__cart_html_erb___214977825009850242_70300164957540' 
    app/views/line_items/create.js.erb:3:in `_app_views_line_items_create_js_erb___2733752682449914066_70300166787700' 
    app/controllers/line_items_controller.rb:52:in `create'

请帮助引脚指出错误？谢谢

来源

2012-07-24 kabir

您将得到一个没有产品的line_item。所以当你做line_item.product时，你会得到一个nil然后，当你做nil.title时会抛出一个错误，所以视图不会被渲染。也许你忘了在创建操作中获取（正确）line_item？

来源

2012-07-24 18:54:12 Ashitaka

AJAX调用不能在Ruby on rails上工作

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