I haven't seen this before, but the fields are set in the where clause, so you could say that you know the values when a record is found.
positionWorkerAssignment.Worker == workerRecId
&& positionWorkerAssignment.Position == positionRecId
I haven't seen this before, but the fields are set in the where clause, so you could say that you know the values when a record is found.
positionWorkerAssignment.Worker == workerRecId
&& positionWorkerAssignment.Position == positionRecId