Ruby on rails 类rails之间的链接

我是rails新手，在我的项目中，我有两个类，它们之间有关系。问题是他们不能列出有器官的服务。以下是我的代码：

modelos

class Admin::Organ
  include Mongoid::Document
  include Mongoid::Search
  include Mongoid::Pagination

  field :name, type: String
  field :address, type: String
  field :acronym, type: String
  field :phones, type: String
  field :emails, type: String
  field :image, type: String
  field :permalink, type: String
  field :schedules, type: Array
  field :coordinates, type: Hash

  has_many :services, class_name: "Service"
  has_many :units, class_name: "Admin::Unit"

  before_save :touch_permalink

  search_in :name

  paginates_per 10

  def url
    "/orgao/#{permalink}"
  end

  private
    def touch_permalink
      self.permalink = self.name.parameterize
    end
end



class Service
    include Mongoid::Document
    include Mongoid::Search
    include Mongoid::Pagination

    field :name, type: String
    field :acronym, type: String
    field :popular_names, type: Array
    field :description, type: String
    field :free, type: Boolean
    field :applicants, type: Array
    field :estimated_time, type: Hash
    field :steps, type: Array
    field :permalink, type: String
    field :other_informations, type: String

    belongs_to :organ, class_name: "Admin::Organ"
    has_and_belongs_to_many :units, class_name: "Admin::Unit"
    has_and_belongs_to_many :audiences, class_name: "Admin::Audience"
    has_and_belongs_to_many :categories, class_name: "Admin::Category"

    before_save :touch_permalink

    search_in :name, :popular_names

    paginates_per 10

    def organ_id 
      read_attribute(:organ_id).to_s
    end

    def url
        "/servico/#{permalink}"
    end

    private
      def touch_permalink
        self.permalink = self.name.parameterize
      end
end


#controlers
class   ServicesController < ApplicationController
    def index
        @organs = Admin::Organ.all
        @services =  Service.page(params[:page].to_i).per(3)
    end

    def show
        @service = Service.where(permalink: params[:permalink]).first

    end
end


class   OrgansController < ApplicationController
    def index
        @organs = Admin::Organ.page(params[:page]).per(2)       
    end

    def show
        @organ = Admin::Organ.where(permalink: params[:permalink]).first
        @organs = Admin::Organ.page(params[:page]).per(1)
    end
end

#call in index.html 
<%= organs.services.name%>

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每当我运行它时，它似乎都会返回一个错误。注意：在mongo relationships上，当您调用关系方法（如服务）时，所有与它关联的文档都会返回。另外，对于您正在使用的分页插件，我假设根据语法使用kaminari，这也将返回一个文档集合

如果是这样的话，你可以看到器官有点像这样：

<% @organs.each do |organ| %>
   <div>Name: <%= organ.name %></div>
   <div>Address: <%= organ.address %></div>
   <div>Services:</div>
   <% organ.services.each do |service| %>
       <div>Name: <%= service.name %></div>
       <div>Acronym: <%= service.acronym %></div>
   <% end %>
<% end %>

<%= paginate @organs %>

您会注意到，要打印出服务，首先需要在@organs中拥有当前文档的句柄，然后需要迭代其中的服务。如果你叫名字，这是一种关系的方法，你会得到关系的名字，我相信这就是你看到的

---

我希望这有帮助。我不得不在字里行间做一些猜测，如果您需要任何进一步的帮助，请回来找我。

请显示stacktrace。您可以添加有关此方法的具体错误的信息吗？此返回名称服务！我想要返回服务名称的用户。