drosca added a comment.

  In D13931#290544 <https://phabricator.kde.org/D13931#290544>, @nicolasfella 
wrote:
  
  > I can get the PulseObject, that is not the problem, the problem is that I 
can't access the model outside of a delegate. model[index] does not work 
because QAbstractItemModel does not implement the {} operator.
  
  
  What is `{} operator`?
  
  > It only works with QList-based models. Therefore I introduced the get 
function to the model. This has the limitation that I don't have an notify 
signal for it. Therefore I use the notify signal of the changed property to 
force a reevaluate of the properties that depend on "get". It's a hacky 
solution, but I didn't find a better one.
  
  Still I don't see the issue, the only problem that you would have is that 
your binding is on JavaScript list (`indexOf`) and when this list changes it 
wouldn't get re-evaluated. But it will never be the case, because channels are 
constant AND the other binding is on `speakersview.currentIndex` so this will 
take care of re-evaluating the binding when changing current device in combobox.
  
  Anyway, you should be able to replace C++ `get`  with
  
    var index = sinkmodel.index(speakersview.currentIndex, 0);
    var role = sinkmode.role("PulseObject"); // This is extension in our 
AbstractModel
    var pulseObject = sinkmodel.data(index, role);

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D13931

To: nicolasfella, drosca
Cc: ngraham, #vdg, plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, 
ali-mohamed, jensreuterberg, abetts, sebas, apol, mart

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