Reference.child失败：第一个参数是无效路径

Question

当我使用参数从数据库获取对象时出现此错误：

代码组件：

 constructor(public employeeService:EmployeeService, public router:Router, public activatedRoute:ActivatedRoute) { }

      ngOnInit() {
        this.email = this.activatedRoute.snapshot.params['email'];
        this.employeeService.getEmployee(this.email).subscribe(employee => {
            if (employee.salary >0) { this.hasSalary = true;}
            this.employee = employee;
            console.log(this.employee);
        });
      }

代码服务：

   getEmployee(email:string)
   {
     return this.item = this.af.object('employeesdb/'+email).valueChanges() as FirebaseObjectObservable<Employee>; 
   }

Answer 1

您需要使用给定的电子邮件查询集合并获取对象。尝试

ngOnInit() {
    this.email = this.activatedRoute.snapshot.params['email'];
    this.employeeService.getEmployee(this.email).subscribe(employee => {
        employee.forEach(snapshot=>{
            console.log(snapshot);
        }
    });
  }

使用angularfire的查询方法

getEmployee(email:string)
   {
     return this.item = this.af.list('/employeesdb', ref => ref.orderByChild('email').equalTo(email)).valueChanges(); 
   }

Answer 2

如错误所示，您的路径可能不包含点（。） 您使用电子邮件地址作为参数，显然包含一个点。 我建议为每位员工生成一个ID，并按照指定的ID获取员工。