rails 3.2更新has_many：通過

我在這一個非常接近，但抓住了一個小細節。我正在嘗試更新has_many：through關係。當我提交編輯表單時，我無法提取我想更新的適當屬性。更新發貨數量的循環不會使用正確的值更新該字段。我怎樣才能從params [：product_shipments]哈希中只提取qty_shipped屬性？rails 3.2更新has_many：通過

This is the contents of my params[:product_shipments] hash that the update action is working with 

"product_shipments"=> {"82"=>{"qty_shipped"=>"234"}, 
         "83"=>{"qty_shipped"=>"324"}, 
         "84"=>{"qty_shipped"=>"324"}}, 
         "commit"=>"Update Shipment", "id"=>"250"}

其中有我需要更新發貨，因爲@ shipment.product_shipments循環額度更新只適用於shipment_id的所有信息。我的問題是，這是通過更新動作

ProductShipment Load (0.3ms) SELECT `product_shipments`.* FROM `product_shipments` WHERE `product_shipments`.`shipment_id` = 250 
BEGIN 
UPDATE `product_shipments` SET `qty_shipped` = 1 WHERE `product_shipments`.`id` = 82 
COMMIT 
BEGIN 
UPDATE `product_shipments` SET `qty_shipped` = 1 WHERE `product_shipments`.`id` = 83 
COMMIT 
BEGIN 
UPDATE `product_shipments` SET `qty_shipped` = 1 WHERE `product_shipments`.`id` = 84 
COMMIT

叫下面的SQL和這裏是產生上面的SQL更新操作：

def update 
    @shipment = Shipment.find(params[:id]) 
    @shipment.update_attributes(params[:shipment]) 

    @shipment.product_shipments.each do |shipment| 
    shipment.update_attributes(:qty_shipped=> params[:product_shipments]) 
    end 

    respond_with @shipment, :location => shipments_url 
end

使用rbates nested_forms寶石不可取的，因爲我想爲了學習軌道工作的目的，弄清楚這一點。

<%= hidden_field_tag("product_shipments[][#{product_shipment.id}]") %> 
<%= hidden_field_tag("product_shipments[][product_id]", product_shipment.id) %> 
<%= text_field_tag "product_shipments[][qty_shipped]", product_shipment.qty_shipped,:class => 'shipment_qty_field'%>&nbsp<%=[email protected]_name %>

來源

2012-07-05 ctilley79

@shipment.product_shipments.each do |product_shipment| 
    product_shipment.update_attributes(:qty_shipped => params[:product_shipments][product_shipment.id][:qty_shipped]) 
end

你不應該做這一切，只需使用嵌套表格。這是Rails！

http://railscasts.com/episodes/196-nested-model-form-part-1

您的PARAMS應該是這樣的

{:product_shipments => { 79 => { :qty_shipped => 450 }, 80 => { :qty_shipped => 35 } }, :shipment_id => 1 }

爲了得到你應該命名這樣

<input name="product_shipments[79][qty_shipped]" value="450" /> 
<input name="product_shipments[80][qty_shipped]" value="35" />

你的領域要生成，

<% @shipment.product_shipments.each do |product_shipment| %> 
    <%= text_field_tag "product_shipments[#{product_shipment.id}][qty_shipped]", product_shipment.qty_shipped || 0 %> 
<% end %>

來源

2012-07-05 05:10:51 SMathew

越來越如下：NoMethodError（對於nil：NilClass，未定義方法'[]'）： – ctilley79

您應該在表單中設置字段及其名稱來解決此問題。 'form_for @shipment do | f | @ shipment.product_shipments.each do | product_shipment | text_field_tag「product_shipments [＃{product_shipment.id}] [qty_shipped]」，product_shipment.qty_shipped end end' 當您在rails中使用嵌套窗體時，所有這些都會自動處理。 – SMathew

使用瑞恩的寶石不是一種選擇。我編輯了這個問題，以包含params散列的內容以及我發現的一些分析。似乎傳遞shipment_id是不合要求的，因爲這是shipment.update_attributes已包含的內容。我沒有嘗試過，但仍然得到同樣的錯誤，因爲我的第一個評論。 – ctilley79

rails 3.2更新has_many：通過

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