创建（：用户）时，FactoryGirl电子邮件已存在

Question

我在测试中使用FactoryGirl，但是当我执行@user = create（：user）时，我得到了

ActiveRecord::RecordInvalid: Validation failed: Email has already been taken

我已经在我的工厂设置了这样的序列

       FactoryGirl.define do
          sequence :email do |n|
            "email#{n}#{rand(200).to_s}#{rand(200).to_s}@factory.com"
          end

          factory :user do
            email
            password  'password'
            password_confirmation  'password'
            customer_id   nil
            staff
          end
        end