json.array!(@notifications) do |notification|

if notification.attached_object
  json.extract! notification, :id, :notification_type_id, :notification_type, :created_at, :is_read
  json.attached_object notification.attached_object
  json.message do
    json.partial! "/api/notifications/#{notification.notification_type}", notification: notification
  end
end

end.delete_if {|n| n == nil }