getObject(key) {
     return this.local.get(key)
         .then(res => {
             if (!res || res === "undefined")
                 return Promise.reject(res);
             return Promise.resolve(JSON.parse(res));
         });
 };

 remove(key) {
     return this.local.remove(key);
 };

 setObject(key, value) {
     return this.local.set(key, JSON.stringify(value));
 };

 clearAll() {
   this.local.clear();
 }

 getUsers() {
   return this.local.get('users');
 }

 storeUser(usersObject) {
   this.local.set('users', usersObject);
 }