module ActiveStorage::Attached::Model

def validate_service_configuration(service_name, model_class, association_name) # :nodoc:
  if service_name
    ActiveStorage::Blob.services.fetch(service_name) do
      raise ArgumentError, "Cannot configure service #{service_name.inspect} for #{model_class}##{association_name}"
    end
  else
    validate_global_service_configuration(model_class)
  end
end