Notification Code's?

[joshm1204]

1. Looking at the mailboxer_notifications table is there any way to identify if a message is a reply?

2. What are the possible values for these fields as I only see them set to nil in the code.

"notification_code"
"notified_object_type"
"notified_object_id"

 create_table "mailboxer_notifications", id: :serial, force: :cascade do |t|
    t.string "type"
    t.text "body"
    t.string "subject", default: ""
    t.string "sender_type"
    t.integer "sender_id"
    t.integer "conversation_id"
    t.boolean "draft", default: false
    t.string "notification_code"
    t.string "notified_object_type"
    t.integer "notified_object_id"
    t.string "attachment"
    t.datetime "updated_at", null: false
    t.datetime "created_at", null: false
    t.boolean "global", default: false
    t.datetime "expires"
    t.index ["conversation_id"], name: "index_mailboxer_notifications_on_conversation_id"
    t.index ["notified_object_id", "notified_object_type"], name: "index_mailboxer_notifications_on_notified_object_id_and_type"
    t.index ["notified_object_type", "notified_object_id"], name: "mailboxer_notifications_notified_object"
    t.index ["sender_id", "sender_type"], name: "index_mailboxer_notifications_on_sender_id_and_sender_type"
    t.index ["type"], name: "index_mailboxer_notifications_on_type"
  end