处理多对多关联嵌套表单时遇到问题

Question

我从 dealcontroller 收到此错误 ActiveRecord::unknown attribute: store，我很确定与此行有关 @[电子邮件受保护](params[:deal])< /code> 这对于嵌套形式正确吗？这就是我的 有。

   class dealController < ApplicationController
   def create
   @city = City.find(session[:city_id])
   @[email protected](params[:deal])
   if @deal.save
   flash[:notice]="successfully created"
   redirect_to @deal
    else
   render 'new'    
   end 
   end
   end

交易模型

    class Deal < ActiveRecord::Base
belongs_to :city
has_many :stores ,:through =>:store_deals
has_many :store_deals
accepts_nested_attributes_for :store_deals
    end

商店模型

    class Store < ActiveRecord::Base
has_many :deals ,:through =>:store_deals
has_many :store_deals
    end

商店交易模型

    class StoreDeal < ActiveRecord::Base
belongs_to :store
belongs_to :deal

    end

城市模型

     class City < ActiveRecord::Base
 has_many :deals 
     end

视图

 <%= form_for @deal ,:url=>{:action =>"create"} do |f|%>

  <%= f.text_field :item_name %><br/>

  <%=f.fields_for :store_deal do |s| %>
  <%=s.text_field :store_name %>
  <%end%>
  <%= f.submit "post"%>

<%end%>

Answer 1

如果我没记错的话（嵌套表单总是让我头疼），它应该看起来更好：

模型

class Deal < ActiveRecord::Base
  belongs_to :city
  has_many :stores ,:through =>:store_deals
  has_many :store_deals
  accepts_nested_attributes_for :stores
end

控制器

def new
  @city = City.find(session[:city_id])
  @deal = @city.deals.build
  @deal.stores.build
end

def create
  @city = City.find(session[:city_id])
  @deal = @city.deals.build(params[:deal])

  # etc.
end

查看

<%= form_for @deal ,:url=>{:action =>"create"} do |f|%>
  <%= f.text_field :item_name %><br/>
  <%= f.fields_for :stores do |s| %>
    <%= s.text_field :name %>
  <% end %>
  <%= f.submit "post" %>
<% end %>

可用的详细信息此处。还有一个 Railscasts 示例