Javascript 不能'；找不到没有ID的FoodObject

我正在尝试使用redis在我的rails应用程序中构建一个购物车功能，如下所示

问题

当我把所有东西连接在一起时，我遇到的问题是上面的错误消息，有什么想法吗？我在数据库中已经有5个FoodObject项目，在过去的5个小时里，我一直在绞尽脑汁想办法解决这个问题

FoodObject控制器

class FoodObjectsController < ApplicationController

    def menu
        @food = FoodObject.all
        @foodObj = FoodObject.find(params[:id])
        @cart_action = @foodObj.cart_action current_customer.try :id
    end

end

---

在您的视图中，似乎您正在链接中使用

@foodObj

，而您可能希望使用block参数中的

food

。

堆栈跟踪将非常有用。查看您的代码，我的最佳猜测是，在您的FoodController类中，

params[:id]

是

nil

，异常由

FoodObject.find（params[:id]）

引发。没有堆栈跟踪很难说。嘿，正如前面所说的，请在问题中添加堆栈跟踪。另外，我也不确定点击哪个url会导致错误？我添加了跟踪@rowlingstones，那么导致错误的url呢？

class FoodObject < ActiveRecord::Base
    def cart_action(current_customer_id)
      if $redis.sismember "cart#{current_customer_id}", id
        "Remove from"
      else
        "Add to"
      end
    end

end

<%= render 'shared/header' %>

<div class="container menu-container">
    <% @food.each do |food| %>
        <div class = "col-md-4 col-lg-4 col-sm-12 food_info">
            <img src="<%= food.imageurl %>">

            <p><%= food.name %> - $<%= food.price %></p>
            <p><%= food.description %></p>
            <%if signed_in?%>

              <%=link_to "", class: "button", data: {target: @cart_action, addUrl: add_to_cart_path(@foodObj), removeUrl: remove_from_cart_path(@foodObj)} do%>
                <i class="fi-shopping-cart"></i>
                <span><%=@cart_action%></span> Cart
              <%end%>
            <%end%>

        </div>
    <% end %>
</div>



<script>
    $(window).load ->
      $('a[data-target]').click (e) ->
        e.preventDefault()
        $this = $(this)
        if $this.data('target') == 'Add to'
          url = $this.data('addurl')
          new_target = "Remove from"
        else
          url = $this.data('removeurl')
          new_target = "Add to"
        $.ajax url: url, type: 'put', success: (data) ->
          $('.cart-count').html(data)
          $this.find('span').html(new_target)
          $this.data('target', new_target)

</script>

<%= render 'shared/footer' %>

activerecord (4.0.8) lib/active_record/relation/finder_methods.rb:267:in `find_with_ids'
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app/controllers/food_objects_controller.rb:5:in `menu'
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