Question

我有一个has_many：通过表单，我无法获得额外的属性来发布到数据库。我在某个地方搞砸了参数名称。我可以让外键发布，但我有另一个属性，我试图在连接表中跟踪。请记住，这是一个100％基于ajax的形式。这就是我所知道的

编辑：在研究了类似的问题之后，我理解我应该构建表单属性，但是我发现的代码由于某种原因不起作用。这是一些资源。

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

Rails 3, nested multi-level forms and has_many through

我不明白附加product_ids是内置到rails中的。那些价值观。为什么将quantity_shipped属性附加到该数组很难？

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

此部分循环显示几次显示某个供应商的所有产品。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>

这是表单提交时的相关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)

以下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]）＆lt; - 不正确，但这是我到目前为止所得到的 if @ shipment.save respond_with @shipment，：location =＆gt; shipments_url 其他 flash [：notice] =“未保存” 结束端

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'

GOT IT。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

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

Answer 1

您的“创建”操作可以像

一样简单

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货件记录创建shipment_products。为此，请将以下内容添加到货件模型

class Shipment
  attr_accessible :shipment_products_attributes
  accepts_nested_attributes_for :shipment_products
end

通过在视图中使用fields_for，这将允许货件接受params[:shipment][:shipment_products_attributes]并将其传递到其货运产品。

在您的新动作中，您可以执行类似

的操作

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

所以在表单中你可以做类似的事情

<%= 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 %>

Answer 2

最简单的解决方案是您需要生成一个看起来像

的哈希数组

: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]}和: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运行。

Rails 3.2 has_many通过表单提交

2 个答案: