private void PushOptimisticUpdate(IEventSource source, IEnumerable <ISourcedEvent> eventsToSave, IDBCollection sources)
{
var arrayOfEventsAsIdbObjects = GetArrayOfEventsAsIDBObjects(source, eventsToSave);
sources.Update(new DBQuery()
{
{ "_SourceId", source.EventSourceId.ToString() },
{ "_Version", source.InitialVersion }
}
, Do.AddEachToSet("Events", arrayOfEventsAsIdbObjects
).Set("_Version", source.Version));
}