*/
private Collection<TicketModel> processMergedTickets(ReceiveCommand cmd) {
Map<Long, TicketModel> mergedTickets = new LinkedHashMap<Long, TicketModel>();
final RevWalk rw = getRevWalk();
try {
rw.reset();
rw.markStart(rw.parseCommit(cmd.getNewId()));
if (!ObjectId.zeroId().equals(cmd.getOldId())) {
rw.markUninteresting(rw.parseCommit(cmd.getOldId()));
}