Rails测试时的TDD测试错误

Question

我正在回去努力学习TDD测试。我正在编写一个教程，希望我创建与主题相关的SponsoredPosts。

我对TDD测试非常陌生，所以我遇到了一些小问题。

我还没有创建一个控制器或模型，由两个单词“赞助”“帖子”组成，所以我在处理它们时对协议不太确定，所以我会向你提供我认为相关的一切，希望你能告诉我哪里出了问题。我相信我刚刚得到了模型和控制器的名称，因为正如您在我的模式文件中看到的那样，"sponsored_posts“表中有一个”sponsored_posts“属性。我承认，在如何处理模型或控制器方面，我并不是最擅长命名的，因此，您也可以提供任何解释来进一步帮助我理解我在命名模型或控制器时出错的地方，这将是非常有用的。

这是我的Sponsored_Posts_Controller_Spec：

require 'rails_helper'
include RandomData

RSpec.describe SponsoredPostsController, type: :controller do

  let (:my_topic) { Topic.create!(name: RandomData.random_sentence, description: RandomData.random_paragraph) }
  let (:my_sponsored_post) { my_topic.sponsored_posts.create!(title: RandomData.random_sentence, body: RandomData.random_paragraph, price: 6) }

  describe "GET show" do

    it "returns http success" do
      get :show, topic_id: my_topic.id, id: my_sponsored_post.id
      expect(response).to have_http_status(:success)
    end

    it "renders the #show view" do
      get :show, topic_id: my_topic.id, id: my_sponsored_post.id
      expect(response).to render_template :show
    end

    it "assigns my_sponsored_post to @sponsored_post" do
      get :show, topic_id: my_topic.id, id: my_sponsored_post.id
      expect(assigns(:sponsored_posts)).to eq(my_sponsored_post)
    end
  end


end

下面是我的Sponsored_Post模型规范：

require 'rails_helper'
include RandomData

RSpec.describe SponsoredPost, type: :model do
  let(:topic) { Topic.create!(name: RandomData.random_sentence, description: RandomData.random_paragraph) }

  let(:sponsored_post) { topic.sponsored_posts.create!(title: RandomData.random_sentence, body: RandomData.random_paragraph, price: 6) }

  it { should belong_to(:topic) }

  describe "attributes" do

    it "should respond to title" do
      expect(sponsored_posts).to respond_to(:title)
    end

    it "should respond to body" do
      expect(sponsored_posts).to respond_to(:body)
    end

    it "should respond to price" do
      expect(sponsored_posts).to respond_to(:price)
    end

  end
end

这是我的SponsoredPosts控制器：

class SponsoredPostsController < ApplicationController

  def show
    @sponsored_post = Sponsored_post.find(params[:id])
  end

  def new
  end

  def edit
  end

end

以下是我的SponsoredPost模型：

class SponsoredPost < ActiveRecord::Base
  belongs_to :topic
end

下面是我的模式文件：

ActiveRecord::Schema.define(version: 20151102190350) do

  create_table "advertisements", force: :cascade do |t|
    t.string   "title"
    t.text     "copy"
    t.integer  "price"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "comments", force: :cascade do |t|
    t.text     "body"
    t.integer  "post_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  add_index "comments", ["post_id"], name: "index_comments_on_post_id"

  create_table "posts", force: :cascade do |t|
    t.string   "title"
    t.text     "body"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.integer  "topic_id"
  end

  add_index "posts", ["topic_id"], name: "index_posts_on_topic_id"

  create_table "questions", force: :cascade do |t|
    t.string   "title"
    t.text     "body"
    t.boolean  "resolved"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "sponsored_posts", force: :cascade do |t|
    t.string   "title"
    t.text     "body"
    t.integer  "price"
    t.integer  "topic_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  add_index "sponsored_posts", ["topic_id"], name: "index_sponsored_posts_on_topic_id"

  create_table "topics", force: :cascade do |t|
    t.string   "name"
    t.boolean  "public",      default: true
    t.text     "description"
    t.datetime "created_at",                 null: false
    t.datetime "updated_at",                 null: false
  end

end

以下是我为SponsoredPost控制器运行规范时的输出：

1) SponsoredPostsController GET show returns http success
     Failure/Error: let (:my_sponsored_post) { my_topic.sponsored_posts.create!(title: RandomData.random_sentence, body: RandomData.random_paragraph, price: 6) }
 ActiveRecord::UnknownAttributeError:
   unknown attribute 'topic_id' for SponsoredPost.

2) SponsoredPostsController GET show renders the #show view
     Failure/Error: let (:my_sponsored_post) { my_topic.sponsored_posts.create!(title: RandomData.random_sentence, body: RandomData.random_paragraph, price: 6) }
 ActiveRecord::UnknownAttributeError:
   unknown attribute 'topic_id' for SponsoredPost.

3) SponsoredPostsController GET show assigns my_sponsored_post to @sponsored_post
     Failure/Error: let (:my_sponsored_post) { my_topic.sponsored_posts.create!(title: RandomData.random_sentence, body: RandomData.random_paragraph, price: 6) }
 ActiveRecord::UnknownAttributeError:
   unknown attribute 'topic_id' for SponsoredPost.

下面是我为模型运行规范时的输出：

1) SponsoredPost should belong to topic
 Failure/Error: it { should belong_to(:topic) }
   Expected SponsoredPost to have a belongs_to association called topic (SponsoredPost does not have a topic_id foreign key.)
 # ./spec/models/sponsored_post_spec.rb:9:in `block (2 levels) in <top (required)>'

2) SponsoredPost attributes should respond to title
 Failure/Error: expect(sponsored_posts).to respond_to(:title)
 NameError:
   undefined local variable or method `sponsored_posts' for #<RSpec::ExampleGroups::SponsoredPost::Attributes:0x007f992170a460>
 # ./spec/models/sponsored_post_spec.rb:14:in `block (3 levels) in <top (required)>'

3) SponsoredPost attributes should respond to body
 Failure/Error: expect(sponsored_posts).to respond_to(:body)
 NameError:
   undefined local variable or method `sponsored_posts' for #<RSpec::ExampleGroups::SponsoredPost::Attributes:0x007f9921701388>
 # ./spec/models/sponsored_post_spec.rb:19:in `block (3 levels) in <top (required)>'

4) SponsoredPost attributes should respond to price
 Failure/Error: expect(sponsored_posts).to respond_to(:price)
 NameError:
   undefined local variable or method `sponsored_posts' for #<RSpec::ExampleGroups::SponsoredPost::Attributes:0x007f99216f9ac0>
 # ./spec/models/sponsored_post_spec.rb:23:in `block (3 levels) in <top (required)>'

Answer 1

在这里，我能给你什么建议：

• 控制器内有错误，应该是SponsoredPost而不是Sponsored_post。
• 在控制器测试中，变量sponsored_posts没有定义，可能是： SponsoredPost.create！(标题: RandomData.random_sentence，body: RandomData.random_paragraph，价格: 6，标题: my_topic)
• 你的模型测试似乎也有同样的问题。