Why doesn't proplist in my service persist?

[JennyW]

I'd like to persist some data in proplist in my service, in cb_create() I have proplist.append((service.name, str(index)) where index is allocated in cb_create(). The commit was successful. But when the config was updated again, in cb_pre_modification() the proplist became empty:

def cb_create(self, tctx, root, service, proplist):

    if service.profile.index is None:

service.profile.index = self._allocate_index(root)

proplist.append((service.name, str(service.profile.index))

def cb_pre_modification(self, tctx, op, kp, root, proplist):

    if op == _ncs.dp.NCS_SERVICE_UPDATE:

service = ncs.maagic.cd(root, kp)

profiles = dict(proplist)

print(profiles)       <-- empty

…

Wonder if I did anything wrong with proplist, can't find much information in NSO document on proplist.

[snovello · Accepted solution]

Hello,,
You need to return the proplist from the create function call for changes to be persisted.

[JennyW]

Aha, that's it, it works now with "return proplist". Thanks!