Magento 2 V1/Shipment API getParentItem on null

Question

I am using postman the rest api to create shipping:

http://myMagento/rest/default/V1/shipment

POST:

{
  "entity": {
    "order_id": 5873,
    "shipment_status": 1,
    "store_id": 1,
    "total_qty": 3,
    "items": [
      {
        "parent_id": 5873,
        "price": 4.99,
        "product_id": 3964,
        "row_total": 3.49,
        "sku": "2457-0000",
        "weight": 1.25,
        "order_item_id": 3964,
        "qty": 3
      }
    ],
    "tracks": [
      {
        "order_id": 5873,
        "weight": 1.25,
        "qty": 3,
        "description": "Tracking Updated",
        "track_number": "123456",
        "title": "DHL",
        "carrier_code": "DHL"
      }
    ],
    "comments": [
      {
        "is_customer_notified": 1,
        "comment": "Order Completed",
        "is_visible_on_front": 1
      }
    ]
  }
}

Can someone help with the above it creates the shipping fine but when click action view the error shows: Is this something to do with parent_id inside items ? what would be the parent_id here?

Fatal error: Uncaught Error: Call to a member function getParentItem() 
on null in 
.../vendor/magento/module-shipping/view/adminhtml/templates/view/items.phtml:19

Answer 1

The parent_id of the shipment item is the entity_id of the shipment and if I understand you correctly you create a new shipment with this request. So you can't now the entity_id of the newly created shipment at that time.

I would suggest to remove the parent_id from the item. The only required fields in the API documentation inside the items array are order_item_id and qty - everything else is optional. I guess the other fields like sku, price etc. will anyway be taken from the corresponding order_item.