checkUser(number) {
    var users = [];
    return new Promise((resolve, rejcted) => {
      this.db.collection('user', ref => ref.where('phoneNumber', '==', number)).valueChanges().subscribe(items => {
        items.map(use => {
          var usr = new User(use);
          users.push(usr);
          console.log(users);
        })
        if (typeof users !== 'undefined' && users.length > 0) {
          resolve(users)
          return users;
        } else {
          resolve("null");
        }
      })
    }).catch(
      function (e) {
        alert("error provider: ");
        alert(e);
      })
  }



/// gdzies tam dalej


    let user = this.checkUser(use.phoneNumber);
        console.log(user);
        user.then(aa => {
          alert("aa");
          let uu = aa;
		  for (var uuuu in uu) {