多个复选框无法工作的Rails 4

Question

我正在使用Rails 4.1.6

我试图创造能力，选择至少3个服务，然后保存与广告。

模型结构如下：

class Service < ActiveRecord::Base
  belongs_to :advertisement
end

class Advertisement < ActiveRecord::Base
   has_many :services
end 

我的表格：

  <% @services.each do |service| %>
      <li>
        <%= check_box_tag 'service_ids[]', service.id -%>
        <%= h service.name -%>
      </li>
  <% end %>

主计长：

  class AdvertisementsController < ApplicationController


        before_action :authenticate_user!
      before_action :set_advertisement, only: [:show, :edit, :update, :destroy]
     respond_to :html, :xml, :json

      def index
        @advertisements = Advertisement.all
       respond_with(@advertisements)
      end

      def show
         @advertisement = Advertisement.find(params[:id])
        respond_with(@advertisement)
      end

      def new
        @advertisement = Advertisement.new
        @services = Service.all
       respond_with(@advertisement)
      end

      def edit
      end


      def create
      @advertisement = Advertisement.new(advertisement_params)
        if @advertisement.save
         if params[:images]

             params[:images].each { |image|
               @advertisement.pictures.create(image: image)
            }
             respond_with(@advertisement)
          end

        else
          format.html { render 'new'} ## Specify the format in which you are rendering "new" page
          format.json { render json: @advertisement.errors } ## You might want to specify a json format as well
        end
      end

      def update
        @advertisement.update(advertisement_params)
      respond_with(@advertisement)
      end

      def destroy
        @advertisement.destroy
        respond_with(@advertisement)
      end

      private
        def set_advertisement
          @advertisement = Advertisement.find(params[:id])
        end

        def advertisement_params
          params.require(:advertisement).permit(:name, :user_id, :advertisement_id, :image,:terms_of_service,:region, :age, :height, :phone_number,:description)
        end
    end

当我检查多桩服务并单击“保存”时，没有错误。当我检查日志文件时，我收到了这条消息“

Parameters: ... "service_ids"=>["1", "2", "3"] ...

但是在控制台我检查：

2.1.3 :008 >t = Advertisement.last (ALL OK)
....
    2.1.3 :008 > t.services

 => #<ActiveRecord::Associations::CollectionProxy []> 

这就是错误。联想方面的问题，但在我看来，每件事都没问题。

有什么问题吗？谢谢

Answer 1

在service_ids中没有advertisement_params。加上：

@advertisement = Advertisement.new(advertisement_params.merge(service_ids: params[:service_ids]))
# or
@advertisement = Advertisement.new(advertisement_params)
@advertisement.service_ids = service_ids