Rails: Avoiding duplication errors in Factory Girl…am I doing it wrong?

Question

Suppose I have a model user, which has a uniqueness constraint on the email field

If I call Factory(:user) once all is well, but i

Answer 1

I found this a nice way to be sure the tests will always pass. Otherwise you can not be sure the 100% of the times you will create a unique email.

FactoryGirl.define do
  factory :user do
    name { Faker::Company.name }
    email { generate(:email) }
  end
  sequence(:email) do
    gen = "user_#{rand(1000)}@factory.com"
    while User.where(email: gen).exists?
      gen = "user_#{rand(1000)}@factory.com"
    end
    gen
  end
end