ruby-on-rails - rails 3 教程 : rspec + factory_girl_rails problem

Question

我一直在关注 Rails 教程(http://railstutorial.org/chapters/beginning，Rails 3 版本)，并且在使用 Factory Girl 和 Rspec 时停在了第 11 章，我有一个测试是过去了，我觉得我做错了什么，但我看不出是什么。
首先，Github 上有一个 git 存储库，其中包含未通过该测试的代码。 http://github.com/Monomachus/ch3_static_pages

所以我得到了用户模型

class User < ActiveRecord::Base
  attr_accessor :password
  attr_accessible :name, :email, :password, :password_confirmation

  has_many :microposts
  .
  .
  .

我得到了微博模型

class Micropost < ActiveRecord::Base
  attr_accessible :content

  belongs_to :user

  default_scope :order => 'microposts.created_at DESC'
end

然后我得到了工厂女孩设置

Factory.define :user do |user|
  user.name                  "Michael Hartl"
  user.email                 "mhartl@example.com"
  user.password              "foobar"
  user.password_confirmation "foobar"
end

Factory.define :micropost do |micropost|
  micropost.content "Foo bar"
  micropost.association :user
end

最后是 Rspec 代码

require 'spec_helper'

describe Micropost do
    .
    . 
  describe "microposts associations" do

    before(:each) do
      @user = User.create(@attr)
      @mp1 = Factory(:micropost, :user => @user, :created_at => 1.day.ago)
      @mp2 = Factory(:micropost, :user => @user, :created_at => 1.hour.ago)
    end

    it "should have a microposts attribute" do
      @user.should respond_to(:microposts)
    end

    it "should be in the reverse order of appearing" do
      @user.microposts.should == [@mp2, @mp1]
    end
  end
end

我得到了一个错误，它明确地告诉我我做错了什么。

Failures:

  1) Micropost microposts associations should be in the reverse order of appearing
     Failure/Error: @user.microposts.should == [@mp2, @mp1]
     expected: [#<Micropost id: 2, content: "Foo bar", user_id: nil, created_at: "2010-12-24 12:47:02", update
d_at: "2010-12-24 13:47:02">, #<Micropost id: 1, content: "Foo bar", user_id: nil, created_at: "2010-12-23 13:
47:02", updated_at: "2010-12-24 13:47:02">],
          got: [] (using ==)
     Diff:
     @@ -1,3 +1,2 @@
     -[#<Micropost id: 2, content: "Foo bar", user_id: nil, created_at: "2010-12-24 12:47:02", updated_at: "20
10-12-24 13:47:02">,
     - #<Micropost id: 1, content: "Foo bar", user_id: nil, created_at: "2010-12-23 13:47:02", updated_at: "20
10-12-24 13:47:02">]
     +[]
     # ./spec/models/micropost_spec.rb:42:in `block (3 levels) in <top (required)>'

如您所见，甚至 user_id 属性也未正确设置 +
显然@user.microposts 没有任何元素。
请帮我解决这个问题，谢谢。

Answer 1

嗯，答案很简单 :)我在微博规范中包含了微博关联。

很明显

describe "microposts associations" do

  before(:each) do
    @user = User.create(@attr)
    @mp1 = Factory(:micropost, :user => @user, :created_at => 1.day.ago)
    @mp2 = Factory(:micropost, :user => @user, :created_at => 1.hour.ago)
  end

  it "should have a microposts attribute" do
    @user.should respond_to(:microposts)
  end

  it "should be in the reverse order of appearing" do
    @user.microposts.should == [@mp2, @mp1]
  end
end

@attr 不包含用户属性，但包含微博属性，当然@user = nil 然后一切都有意义。因此，如果您确实遇到同样的问题，请将此代码包含到用户规范中。现在我所有的测试都通过了:)