ruby on rails 3-测试创建状态失败

Question

我的测试没有成功创建指导原则，我无法找出原因。

guideline_controller_test.rb中的测试是

test "should create guideline when logged in" do
sign_in users(:tester)
assert_difference('Guideline.count') do
  post :create, guideline: { content: @guideline.content, hospital: @guideline.hospital, title: @guideline.title }
end

我在guideline_controller.rb中的创建操作是

def create
@guideline = Guideline.new(params[:guideline])
respond_to do |format|
  if @guideline.save
    format.html { redirect_to @guideline, notice: 'Guideline was successfully created.' }
    format.json { render json: @guideline, status: :created, location: @guideline }
  else
    format.html { render action: "new" }
    format.json { render json: @guideline.errors, status: :unprocessable_entity }
  end
end

结束

当我尝试运行测试时，失败了

     1) Failure:
test_should_create_guideline_when_logged_in(GuidelinesControllerTest) [test/functional/guidelines_controller_test.rb:36]:
"Guideline.count" didn't change by 1.
<4> expected but was
<3>.

test.log显示（已尝试复制相关位）

 Processing by GuidelinesController#create as HTML
  Parameters: {"guideline"=>{"content"=>"www.test.com", "hospital"=>"Test Hospital", "title"=>"Test title"}}
  User Load (0.3ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 781720531 LIMIT 1
   (0.1ms)  SAVEPOINT active_record_1
  Guideline Exists (0.3ms)  SELECT 1 AS one FROM "guidelines" WHERE (LOWER("guidelines"."title") = LOWER('Test title') AND "guidelines"."hospital" = 'Test Hospital') LIMIT 1
   (0.1ms)  ROLLBACK TO SAVEPOINT active_record_1
  Rendered guidelines/_form.html.erb (256.5ms)
Completed 200 OK in 313ms (Views: 279.2ms | ActiveRecord: 0.8ms)
   (0.2ms)  SELECT COUNT(*) FROM "guidelines" 
   (0.1ms)  rollback transaction

有人能帮忙吗？

Answer 1

看起来您正试图创建一个标题/医院组合已经存在的指南。你得到了正确的日志-这一行：

Guideline Exists (0.3ms)  SELECT 1 AS one FROM "guidelines" WHERE [...]

Rails确保不存在重复的准则（您的模型中可能有一个"唯一"的验证）。它找到匹配项，因此取消保存事务：

(0.1ms)  ROLLBACK TO SAVEPOINT active_record_1

更改您要插入的标题和/或医院，它应该会顺利通过。

编辑：

根据我们在评论中的对话，我认为问题如下：您正在用@guideline = guidelines(:one)初始化@guideline，它加载您在fixture文件中定义的名为"one"的指导方针。

但是，当您开始在Rails中运行测试时，它会自动将所有的fixture加载到测试数据库中。因此，当您尝试使用@guideline中的属性创建新的指导方针时，保证会得到重复！

最简单的方法是在测试代码中定义新的属性：

post :create, guideline: {
    content:  "This is my new content!",
    hospital: "Some Random Hospital",
    title:    "Some Random Title"
}

希望能有所帮助！