爲什麼Factory Girl在describe塊中調用時會創建重複對象

Question

我正在使用Factory Girl和Faker創建獨特的測試用戶。 用戶模型在電子郵件上具有唯一性驗證。

如果我嵌套2個描述塊的級別，那麼一些測試將失敗，因爲有重複的電子郵件。 如果我沒有嵌套描述塊，那麼所有的工廠調用都返回唯一的用戶並且測試通過。

爲什麼Faker在第一種情況下會生成重複的電子郵件？

#factories/user.rb 

# a simple factory with Faker 
FactoryGirl.define do 
    factory :student, class: User do 
    first_name { Faker::Name.first_name } 
    last_name { Faker::Name.last_name } 
    password { Faker::Lorem.words(3).join } 
    email { Faker::Internet.email } 
    end 
end 

#spec/models/user_spec.rb 

# in this test structure, Faker returns duplicate emails 
describe "nested describe blocks" do 
    describe "block 1" do 
    it "creates faker duplicates" do 
     10.times{ 
     FactoryGirl.create(:student) 
     } 
    end 
    end 
    describe "block 2" do 
    it "creates faker duplicates" do 
     10.times{ 
     FactoryGirl.create(:student) 
     } 
    end 
    end 
end 

# in this structure, Faker emails are unique 
describe "no nested describe blocks" do  
    it "doesn't create duplicates" do 
    10.times{ 
     FactoryGirl.create(:student) 
    } 
    end  
    it "doesn't create duplicates" do 
    10.times{ 
     FactoryGirl.create(:student) 
    } 
    end  
end 

Rspec的返回以下錯誤：

Failure/Error: FactoryGirl.create(:student) 
ActiveRecord::RecordInvalid: 
    Validation failed: Email has already been taken, Email has already been taken, Authentication token has already been taken 

Answer 1

幾個小時敲打我的腦袋在桌子上後，我的同事找到了答案：

Why isn't factory_girl operating transactionally for me? - rows remain in database after tests

的工廠變成了不是交易性的。下面這行後，問題消失了spec_helper.rb：

config.use_transactional_fixtures = true 

Answer 2

@Dyanisse正如你所說的，我們需要做下面的配置，spec_helper.rb

config.use_transactional_fixtures = true 

但只有是不夠的。我們需要將其添加在大括號重新評估其如下

auth_token { Faker::Lorem.characters(32) } 

它不會一起工作：

auth_token Faker::Lorem.characters(32) 

Answer 3

法克爾仍會產生重複的電子郵件最終。您可以使用序列或檢查電子郵件尚不存在。見Faker is producing duplicate data when used in factory_girl