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我有一个 has_many :through 表单,我无法获得额外的属性来发布到数据库。我在某处弄脏了参数名称。我可以获取要发布的外键,但我有另一个要在连接表中跟踪的属性。请记住,这是一个 100% 基于 ajax 的表单。这是我所知道的

编辑:在研究了类似的问题后,我知道我应该构建表单属性,但我发现的代码由于某种原因不起作用。这里有一些资源。

http://railsforum.com/viewtopic.php?id=20203

Rails 3,嵌套多级表单和 has_many 通

我不明白的是附加 product_ids 是内置在导轨中的。这些价值观发布。为什么很难将 quantity_shipped 属性附加到该数组?

Models and Relationships
  Shipment  has_many :products :through => :product_shipments
  Product   has_many :shipments :through => :product_shipments
  ProductShipments belongs_to :shipment,  belongs_to :product

ProductShipments table
  t.integer    :shipment_id  
  t.integer    :product_id
  t.integer    :qty_shipped  <-- This is the Problem Child

此部分循环显示来自某个供应商的所有产品几次。它为 product_ids 生成一个数组,为 product_shipments 数量生成另一个数组。

_product_shipments.html.erb。

<div id="product_shipments_container">
<h3>Assign Products to Ship</h3>
<ul class="product_shipments" id="product_shipments">
  <% Product.by_client(@client_id).each do |product| %>
    <%= content_tag_for :li, product, :value => product.id do %>
      <%= hidden_field_tag("shipment[product_ids][]", product.id) %>
      <%= product.product_name %><%= text_field_tag("product_shipments[qty_shipped]")%> <--This is where the issue lies
    <% end %>
  <% end %>
</ul>
</div>

这是提交表单时的相关 POST 数据

"product_ids"=>["1", "3"]}, "product_shipments"=>{"qty_shipped"=>["32", "23"]}

这是发送到数据库的 sql

INSERT INTO `product_shipments` (`product_id`, `qty_shipped`, `shipment_id`) 
VALUES (1, NULL, 155)
INSERT INTO `product_shipments` (`product_id`, `qty_shipped`, `shipment_id`)
VALUES (3, NULL, 155)

这是我的控制器中的操作

def create
 @shipment = Shipment.new(params[:shipment])

 @product_shipments = @shipment.product_shipments.build(params[:product_shipments])

[:qty_shipped]) <- 不正确,但如果@shipment.save respond_with @shipment, :location => shipping_url else flash[:notice]= "Not saved" end end

这是我遇到的最后一个问题。

TypeError (can't convert Symbol into Integer):
  app/controllers/shipments_controller.rb:24:in `[]'
  app/controllers/shipments_controller.rb:24:in `create'

知道了。使用下面的正确答案进行更改后。我能够将控制器更正为以下内容

@product_shipments = @shipment.product_shipments.build(params[:product_shipments])
4

2 回答 2

1

您的“创建”操作可以很简单

def create
  @shipment = Shipment.new(params[:shipment])

  if @shipment.save
    # success
  else
    # failure
  end
end

如果您使用嵌套属性通过新的发货记录创建 shipping_products。为此,请将以下内容添加到 Shipment 模型中

class Shipment
  attr_accessible :shipment_products_attributes
  accepts_nested_attributes_for :shipment_products
end

通过fields_for在视图中使用,这将允许货件接受params[:shipment][:shipment_products_attributes]并将这些信息传递给它的 shipping_products。

在你的新动作中,你可以做类似的事情

def new
  @shipment = Shipment.new
  # collect the ids of the products you want to create shipment products for
  @shipment.shipment_products.build([{:product_id=> ...},{:product_id=> ...}, ...])
end

这样你就可以在表格中做类似的事情

<%= form_for @shipment, :remote => true do |f|%>
  ...
  ...
  <ul>
    <%= f.fields_for :shipment_products do |sp_f| %>
      <li>
        <%= sp_f.text_field :qty_shipped %>
        <%= sp_f.hidden_field :product_id %>
      </li>
    <% end %>
  </ul>
<% end %>
于 2012-06-28T03:42:31.373 回答
1

最简单的解决方案是您需要生成一个哈希数组,看起来像

:product_shipments=>[{:product_id=>1, :qty_shipped=>32},{:product_id=>3, :qty_shipped=>23}]

而不是两组哈希:shipment=>{:product_ids=>[1,3]}:product_shipments=>[:qty_shipped=>[32,23]].

为此,请将您的视图代码更改为

<%= hidden_field_tag("product_shipments[][product_id]", product.id) %>
<%= product.product_name %><%= text_field_tag("product_shipments[][qty_shipped]")%>

然后您的控制器操作应该按原样工作。

于 2012-06-28T21:43:17.163 回答