Add a Trait to skip callbacks in a FactoryBot factory

app_models_user.rb

# app/models/user.rb
#
class User
  after_create :foo
  
  private
  
  def foo
    # ..something we don't do very often
  end
end

spec_factories_user.rb

# spec/factories/user.rb
#
# Skips the foo callback generated by each instance where this trait
# is called.
#
# https://stackoverflow.com/a/52107557/2892779
#
# Usage:
#
#   create(:user, :skip_foo)
FactoryBot.define do
  factory :user do
    trait :skip_foo do
      after(:build) do |member|
        member.define_singleton_method(:foo) {}
      end
    end
  end
end