ruby-on-rails - 在让(:user) { create(:user) } # => RecordNotFound

Question

我有一个测试用例:

describe User do
  let(:user) { create(:user) } # FactoryGirl
  it { User.count == 1 }  
end

和设置:

RSpec.configure do |config|
  config.include FactoryGirl::Syntax::Methods
  config.before(:suite) { DatabaseCleaner.strategy = :truncation }
  config.before(:each) { DatabaseCleaner.start }
  config.after(:each) { DatabaseCleaner.clean }
  config.use_transactional_fixtures = false
end

为什么它不起作用？如何使用let得到一个真正持久化的记录？

Answer 1

let 调用是惰性求值的，除非调用特定方法，否则它们不会运行:

describe User do
  subject { user }
  let(:user) { create(:user) } # FactoryGirl
  it { … }  
end

或者，使用 let! 作为总是被评估的前提条件:

describe User do
  let!(:user) { create(:user) } # FactoryGirl
  it { … }  
end