In my application users may have concurrent independent collaboration sessions. When a user starts a collaboration session, a new collection node is created, s/he subscribes to that collection node, sends invitation to participants (selective users) by a common collection node. My application needs to know which participants subscribed to this newly created collection node for collaboration session, because when subscribed user sends a message on this collection node, it needs to send notifications, over common collection node, to users which did not subscribe yet.
I looked at CollectionNode documentation and find userRoles property but it returns empty object. Then I tried getExplicitUserRoles() but again it returns same empty object that userRoles returns.