Canonical way to find transfers for an account in Daml Finance

[Johan_Sjodin]

Hi @huw,

Your point is well-taken. In scenarios where the incoming controllers of the receiving account are empty, the newOwner would solely witness the credit/creation of the new holding. However, they would not be privy to the corresponding holding being debited/archived. To rectify this situation, we could incorporate the newOwner as choice observers in the following manner:

  nonconsuming choice Transfer : ContractId Transferable
    -- ^ Transfer a contract to a new owner.
    with
      actors : Parties
        -- ^ Parties authorizing the transfer.
      newOwnerAccount : AccountKey
        -- ^ Account contract id of the parties to transfer the contract to.
    observer newOwnerAccount.owner
    controller actors, getLockers this
    do
      transfer this self arg

I have added a github issue 837 where we can track this.

Please also find the following related forum question:

Can we define, emit and listen to Custom Events?

There is no special inbuilt for custom events as every choice exercise is an event. So if you want to emit an event, you can just create a choice without an effect: controller (signatory this) can nonconsuming MyEvent : () with message : Text do return () If you exercise that, all you’ll get is an extra node on the transaction tree that you can react to.

I hope that helps.

Johan