login() {
    let loginData = {
      username: this.username,
      password: this.password,
      school:   this.selectedSchool //this.selectSchool retorna o ID da escola, e não o Object
    };

    this.authService
      .login(loginData)
      .then(response => {
        this.aurelia.setRoot('app');
      })
      .catch(err => {
        console.log("Login failure : " + err);
      });
  }