Azure Digital Twin: event hub doesn't process relationship updates correctly?

Antonio Garofalo 0

I need to extrapolate data for a database and to do so I need information about which digital twin relationship was updated.

I set up the event route to trigger the event hub for these filters:

type = 'Microsoft.DigitalTwins.Relationship.Create' OR
type = 'Microsoft.DigitalTwins.Relationship.Update'

Then, whenever a new relationship is created I get this kind of message:

  {
    "$relationshipId": "poleesp1hassensoresp1",
    "$etag": "W/\"7d16a3d4-a121-40ea-b9f6-5b79a88efd6c\"",
    "$sourceId": "poleesp1",
    "$relationshipName": "has",
    "$targetId": "sensoresp1",
    "EventProcessedUtcTime": "2023-06-28T14:10:28.8409644Z",
    "PartitionId": 0,
    "EventEnqueuedUtcTime": "2023-06-28T14:05:05.4490000Z"
},

Which is exactly what I want because I can work on the fields I need, especially $relationshipId.

However, whenever a relationship is updated (not created), the message the event hub forwards is this one:

{
    "modelId": "dtmi:digitaltwins:city:Pole;1",
    "patch": [
      {
        "value": {},
        "path": "",
        "op": "replace"
      }
    ],
    "EventProcessedUtcTime": "2023-06-28T14:10:28.8409644Z",
    "PartitionId": 0,
    "EventEnqueuedUtcTime": "2023-06-28T14:10:15.4000000Z"
  }

Which doesn't have pretty much any information related to the relationship itself, is this normal? Is there a workaround for this?

LeelaRajeshSayana-MSFT 13,456

Hi @Antonio Garofalo Greetings! Welcome to Microsoft Q&A forum. Thank you for posting this question here.

Can you please share the steps you have followed in trying to update the relationship between the twins. I have updated a property of the relationship from the Azure Digital twin explorer and noticed that the event generated has the relationship ID details. Please find the below events generated when I tried to update the relationship.

	Received event: {"timeStamp":"2023-06-28T21:56:20.0519944Z","sourceTimeStamp":null,"serviceId":"rajdigitaltwin.api.eus.digitaltwins.azure.net","id":"floor1","modelId":"dtmi:contosocom:DigitalTwins:Space;1","key":"ownershipDepartment","value":"Comms Divisions","relationshipTarget":null,"relationshipId":"floor_to_room_edge","action":"Update"}
	Received event: {"relationshipId":"floor_to_room_edge","action":"Delete","timeStamp":"2023-06-28T21:57:24.3130185Z","serviceId":"rajdigitaltwin.api.eus.digitaltwins.azure.net","name":"contains","source":"floor1","target":"room21"}
	Received event: {"relationshipId":"95d8dbf8-6098-4592-8b84-24f4ea0ee0d1","action":"Create","timeStamp":"2023-06-28T21:58:02.9247192Z","serviceId":"rajdigitaltwin.api.eus.digitaltwins.azure.net","name":"contains","source":"floor1","target":"room21"}

All the update, delete and create events seem to capture the $relationshipid

Antonio Garofalo 0 Reputation points

2023-06-29T09:15:04.3133333+00:00
Thank you for your answer, I'm working using the digital twins core library for javascript, essentially I recall the upsertRelationshipt() function when I want to update a relationship and pass the same relationshipId of the relationship I want to update, because apaprently there's no update() function.

const relationship = { $relationshipId: "poleesp1hassensoresp1", $sourceId: "poleesp1", $relationshipName: "has", $targetId: "sensoresp1", isAccessRestricted: false }; await serviceClient.upsertRelationship( relationship["$sourceId"], relationship["$relationshipId"], relationship );
LeelaRajeshSayana-MSFT 13,456 Reputation points

2023-07-05T20:50:06.1666667+00:00

Hi @Antonio Garofalo Apologies for the delayed feedback on this. Thank you for sharing additional information on this. I am checking with the product team on further feedback on this. Please stay tuned to this thread for more updates in the next couple of days.