class FactoryBot::Evaluator

def self.define_attribute(name, &block)
  if instance_methods(false).include?(name) || private_instance_methods(false).include?(name)
    undef_method(name)
  end
  define_method(name) do
    if @cached_attributes.key?(name)
      @cached_attributes[name]
    else
      @cached_attributes[name] = instance_exec(&block)
    end
  end
end