屬性無法通過Rspec的訪問

Question

型號：

class User < ActiveRecord:Base 
    has_many :roles 
    has_many :networks, :through => :roles 
end 

class Network < ActiveRecord:Base 
    has_many :roles 
    has_many :network, :through => :roles 
end 

class Role < ActiveRecord:Base 
    attr_accesible :user_id, :network_id, :position 

    belongs_to :user 
    belongs_to :network 
end 

的角色默認爲 「會員」

在控制檯我可以輸入：

> @role = Role.find(1) 
> @role.position 
=> "member" 

但在我的Rspec的測試中，我使用FactoryGirl創建用戶，網絡和角色。並且我有測試@role.should respond_to(:position)我也嘗試過將它分配給@role.position = "admin"。無論如何，我收到如下錯誤：

Failure/Error: @role.should respond_to(:position) 
    expected [#<Role id:1, user_id: 1, position: "member", created_at...updated_at...>] to respond to :position 

我是否缺少一些非常基本的東西？

編輯：

factories.rb

FactoryGirl.define do 
    factory :user do 
    name    "Example User" 
    sequence(:email) {|n| "email#{n}@program.com"} 
    end 

    factory :network do 
    sequence(:name)  {|n| "Example Network #{n}"} 
    location    "Anywhere, USA" 
    description   "Lorem Ipsum" 
    end 

    factory :role do 
    association :user 
    association :network 
    position    "member" 
    end 

end 

network_controller_spec

... 
before(:each) do 
    @user = test_sign_in(FactoryGirl.create(:user) 
    @network = FactoryGirl.create(:network) 
    @role = FactoryGirl.create(:role, :user_id => @user.id, :network_id = @network.id) 
    #I have also tried without using (_id) I have tried not setting the position in the factories as well. 
end 

it "should respond to position" do 
    get :show, :id => @network 
    # This may not be the best or even correct way to find this. But there should only be one, and this method works in the console. 
    @role = Role.where(:user_id => @user.id, :network_id => @network.id) 
    @role.should respond_to(:position) 
end 

Answer 1

傑西是他的意見是正確的，希望他會回來，並把它寫成一個答案，在此期間， ，代碼應該是：

@role = Role.where(:user_id => @user.id, :network_id => @network.id).first 

或

@role = Role.find_by_user_id_and_network_id(@user.id, @network.id) 

順便說一句，這似乎有點奇怪在網絡控制器規格（被測試的角色類，除非這僅僅是一個探索性的測試工作，爲什麼預期的東西不工作）。