Как разобрать карту [String, String] с Аргонавт

Question

Я хочу, чтобы разобрать что-то вроде:

{ 
      "OutputDocumentType": "receipt", 
      "ParsedFields": { 
      "smart_tags": "R°\nVul\nZe", 
      "vendor": "", 
      "vendor_terms": "", 
      "vendor_warranty": "", 
      "vendor_support": "", 
      "vendor_url": "", 
      "expense_category": "General Retail", 
      "tracking_no": null, 
      "carrier_name": null, 
      "tracking_link": null, 
      "tracking_status": null, 
      "shipping_speed": null, 
      "date_shipped": null, 
      "date_estimated": null, 
      "shipping_address_street_1": null, 
      "shipping_address_street_2": null, 
      "shipping_address_state_province": null, 
      "shipping_address_city": null, 
      "shipping_address_zip": null, 
      "shipping_phone": null, 
      "shipping_mobile": null, 
      "shipping_fax": null, 
      "account": "", 
      "purchase_confirmation_no": "", 
      "purchase_order_no": "", 
      "purchase_time": "", 
      "purchase_invoice_no": "", 
      "purchase_invoice_date": "", 
      "purchase_discounts": "", 
      "subtotal_amount": "", 
      "shipping_cost": "", 
      "purchase_warranty": "", 
      "transaction_id": "", 
      "payment_address_street_1": "", 
      "payment_address_street_2": "", 
      "payment_address_city": "", 
      "payment_address_state_province": "", 
      "payment_address_zip": "", 
      "payment_phone": "", 
      "payment_mobile": "", 
      "payment_fax": "", 
      "receipt_date": "", 
      "payment_type": "Cash", 
      "total_amount": "$16.95" 
      } 
} 

Но когда я пытаюсь ей не удается в tracking_no, потому что значение null. Как я могу сделать это в размере null?

Answer 1

Только что делает карту Map[String,Option[String]] решает ее.