constructor(params: NavParams, modal: Modal, menu: MenuData, nav: NavController, cart: CartService) {
     this.item = _.cloneDeep(params.get('item'));
     this.order = [];
     this.cart = cart;
     this.modal = modal;
     this.menu = menu;
     this.nav = nav;
     this.initOrder();
 }

 constructor(
   private nav: NavController,
   navParams: NavParams,
   private geofenceService: GeofenceService,
   private app: IonicApp
 ) {
   this.geofenceService = geofenceService;
   this.geofence = navParams.get("geofence");
   this.transitionType = this.geofence.transitionType.toString();
   this.notificationText = this.geofence.notification.text;
   this._radius = this.geofence.radius;
   this._latLng = Leaflet.latLng(this.geofence.latitude, this.geofence.longitude);
 }

    constructor(nav: NavController, params: NavParams) {
        super();
        let partyId = params.get('partyId');
        this.subscribe('party', partyId, () => {
            this.autorun(() => {
                this.party = Parties.findOne(partyId);
                this.getUsers(this.party);
            });
        }, true);

        this.subscribe('uninvited', partyId, () => {
            this.getUsers(this.party);
        }, true);
    }

 constructor(params: NavParams) {
     let partyId = params.get('partyId');
     super(partyId);
 }

 constructor(params: NavParams) {
  this.chat = params.get('chat');
 }