嵌套表单 fields_for ：价格，重复表单几次

Question

我有多对多的关联，然后我

fields_for :device

以良好的方式进行此显示，但我无法保存它，我得到未知的属性：价格

和 fields_for :devices

依此类推，一台设备会再重复一次，如果我写 f.fields_for :price 它会提供良好的文本字段计数，但它写下

unknown attribute: price
Rails.root: C:/Users/Ignas/mildai/baze4

Application Trace | Framework Trace | Full Trace
app/controllers/commercial_offers_controller.rb:74:in `block in update'
app/controllers/commercial_offers_controller.rb:73:in `update'

谢谢您的

附加信息：

的控制器

 def edit_prices
        @commercial_offer = CommercialOffer.find(params[:id])
     end

用于为一台设备编辑价格

  <%= link_to "Edit prices", :controller => "CommercialOffers", :action => "edit_prices", :id => @commercial_offer %>

_edit_price.html.erb

<%= form_for @commercial_offer do |f| %> 
        <% CommercialOffer.find(params[:id]).devices.each do |device| %>
            <%=  check_box_tag  "commercial_offer[device_ids][]", device.id, @commercial_offer.devices.include?(device) %>
                <%=  device.name %>         
            <%= f.fields_for :prices do |builder|  %>
                <%= render 'prices/new_price', :f => builder, :commercial_offer => @commercial_offer, :device => device %>
            <% end %>
         <% end %> 
            <div class="actions">
        <%= f.submit "Save"%>
      </div>
    <% end %>

链接，它仅渲染一次，但它为一台设备渲染，例如有多少台设备具有相同的 Commercial_offer_id

_new_price.html.erb
Price:
<%= f.text_field :price %></br>
Quantity:
<%= f.text_field :quantity %></br>
Device id:
<%= f.text_field :device_id, :value => device.id %></br>


class CommercialOffer < ActiveRecord::Base
has_many :prices
has_many :devices, :through => :prices
accepts_nested_attributes_for :prices
accepts_nested_attributes_for :devices
end

class Device < ActiveRecord::Base
has_many :prices
accepts_nested_attributes_for :prices
has_many :commercial_offer, :through => :prices

class Price < ActiveRecord::Base
    belongs_to :device
    belongs_to :commercial_offer
end

Answer 1

没有任何 field_for 方法。

另外你的问题也不清楚。你到底想做什么？只显示一台设备？哪一个？第一个，最后一个？

UPD

Commercial_offer.rb：

class CommercialOffer < ActiveRecord::Base
  has_many :prices
  has_many :devices, :through => :prices
  accepts_nested_attributes_for :prices
  accepts_nested_attributes_for :devices, :allow_destroy => true
end

您的视图

<%= form_for @commercial_offer do |f| %> 
    <%= f.fields_for :devices do |device| %>
        <p>
          <%= device.check_box :_destroy %>
          <%= device.label "Destroy?" %>
        </p>
        <p>
          <%= device.text_field :name %>         
        </p>
        <%= device.fields_for :prices do |builder|  %>
           <%= render 'prices/new_price', :f => device %>
        <% end %>
     <% end %> 
   <% end %>
   <div class="actions">
     <%= f.submit "Save"%>
   </div>
<% end %>

_new_price 部分

<%= f.text_field :price %></br>
Quantity:
<%= f.text_field :quantity %></br>
Device id:
<%= f.text_field :device_id %></br>