在Rails中使用工厂女孩进行单表继承 [英] Single Table Inheritance with Factory Girl in Rails

问题描述

我正在使用Capybara和FactoryGirl制作Rails 4.0.1应用程序，但是我无法使我的测试正常工作.

I'm making a Rails 4.0.1 app using Capybara and FactoryGirl but I'm having trouble getting my tests to work correctly.

我正在使用单表继承来制作Collection < ActiveRecord::Base和VideoCollection < Collection模型.在我的测试中使用Factory Girl时，模型似乎没有得到应有的实例化.

I'm using single table inheritance to make a Collection < ActiveRecord::Base and a VideoCollection < Collection model. When using Factory Girl in my tests, the models don't seem to get instantiated as they should.

• 当我在浏览器中目视检查正在测试的视图时，它会正确显示该集合.
• 当我在测试中为同一视图运行print page.html时，该集合未出现在页面代码中.
• 如果我使用rails c test进入测试控制台并执行FactoryGirl.create(:video_collection)，那么视频集就可以插入数据库了.

• When I visually inspect a view in my browser that I'm testing, it displays the collection properly.
• When I run print page.html in the test for the same view, the collection doesn't appear in the page code.
• If I go into the test console with rails c test and execute FactoryGirl.create(:video_collection), then the video collections gets inserted into the database no problem.

我的模特:

# ------in app/models/collection.rb------
class Collection < ActiveRecord::Base
end

# ------in app/models/video_collection.rb------
class VideoCollection < Collection
end

# ------in db/schema.rb------ 
create_table "collections", force: true do |t|
  t.string   "type"
  t.datetime "created_at"
  t.datetime "updated_at"
  t.string   "name"
  t.string   "tile_image_link"
end

我的工厂:

FactoryGirl.define do
...
  factory :collection do |collection|

    factory :video_collection, class: VideoCollection, parent: :collection do |u|
      u.sequence(:name) { |n| "Video Collection #{n}" }
      tile_image_link   "some-link.png"
      type "VideoCollection"
    end
  end
...
end

我的测试:

# -----in spec/requests/video_collections_spec.rb-----
require 'spec_helper'
describe "VideoCollections" do

  let(:video_collection) do 
    FactoryGirl.create(:video_collection) 
  end

  ...

  ###  This test fails ###
  expect(page).to have_link(video_collection.name, 
                            href: "video/#{video_collection.id}") 

测试输出:

Failure/Error: expect(page).to have_link(video_collection.name,
   expected #has_link?("Video Collection 1", {:href=>"video/181"}) to return true, got false

我不明白为什么在测试运行时工厂的video_collection记录未正确插入.令我感到困惑的是，我可以使用相同的命令从控制台中毫无问题地插入它们.我的工厂代码是否存在错误?

I don't understand why the video_collection records from the factory aren't getting inserted properly when the test runs. It's even more baffling to me that fact that I can insert them from the console with the same command with no problem. Is there an error in my factory code somewhere?

感谢您的帮助！

推荐答案

更改:

let(:video_collection) do 
  FactoryGirl.create(:video_collection) 
end

收件人:

let!(:video_collection) do 
  FactoryGirl.create(:video_collection) 
end

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