属性无法通过Rspec的访问

Question

型号：

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 

的角色默认为 “会员”

在控制台我可以输入：

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

但在我的Rspec的测试中，我使用FactoryGirl创建用户，网络和角色。并且我有测试@role.should respond_to(:position)我也尝试过将它分配给@role.position = "admin"。无论如何，我收到如下错误：

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东西？

编辑：

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

杰西是他的意见是正确的，希望他会回来，并把它写成一个答案，在此期间， ，代码应该是：

@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) 

顺便说一句，这似乎有点奇怪在网络控制器规格（被测试的角色类，除非这仅仅是一个探索性的测试工作，为什么预期的东西不工作）。