Something

    ContactModel{
        id: contactModel
    }

    SwServiceModel{
        id: servicesModel
    }

    EventsModel{
        id: twitterModel
        
        Component.onCompleted: {
            twitterModel.setService("twitter");
        }
    }
    
    ProxyModel{
        id: twitterProxyModel
        filterRole: EventsModel.AuthorIdRole
        filterString: window.currentContactId
        
        Component.onCompleted: {
            twitterProxyModel.setModel(twitterModel);
        }
    }