Referencing one trait from another trait in factory_bot

Sometimes you want to DRY up traits by referencing one trait from another trait in factory_bot. I tried searching on “inheriting traits” (that’s just for one factory inheriting traits from another and was in a factory_bot issue in GitHub). I accidentally stumbled upon the answer in a slightly unrelated StackOverflow question about calling a trait from another trait with params in factory_girl.

Ultimately, you use the trait name from the first trait as a method invocation in the referencing trait:

FactoryBot.define do
  factory :user do
    role
    trait :with_supervisor do
      # complex set up might go
      # here
      after(:create) do |user|
        supervisor { create(:user) }
      end
    end
    trait :with_organization do
      with_supervisor # invoke the other trait first
      organization
    end
  end
end