Transaction is null in model ChangedEvent

@Dominic.Lerbs wrote:

Hi,

I am programatically updating an array in my model:

let model = part.diagram.model;
let existingPhotoNames: Array<string> = part.data["photoNames"];
model.skipsUndoManager = true;
model.startTransaction("Add photo");
if (Array.isArray(existingPhotoNames)) {
     model.setDataProperty(part.data, "photoNames", [...existingPhotoNames, fileName]);
} else {
    model.setDataProperty(part.data, "photoNames", [fileName]);
}
model.commitTransaction("Add photo");
model.skipsUndoManager = false;

However, in the model changedEvent, the transaction object (event.object) is always null for the transactionFinished event.

grafik.png683x908 20.9 KB

Can you give me a hint what I am doing wrong?

Best regards,
Dominic

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