Firebase读数返回null

Question

在我的应用程序中，我试图从Firebase数据库中获取用户信息，但它总是返回NULL。下面是我从数据库中读取当前用户信息的代码

func workWithDataBase(){
    let email = "[e-mail]"
    let password = "test23"


    FIRAuth.auth()?.signIn(withEmail: email, password: password, completion: { (user, error) in
        if error != nil {
            print(error)
            return
        } else {
            print("SIGNED IN\n")

            let uid = FIRAuth.auth()?.currentUser?.uid

            FIRDatabase.database().reference().child("users").child(uid!).observeSingleEvent(of: .value, with: { (snapshot) in
                print(snapshot)
            }) {
                (error) in
                print(error.localizedDescription)
            }   
        }
    }) 
}

我的问题是，如果email和name的字段不是空的，为什么“observesingleevent”方法返回null？我怎么才能修好这个？

Answer 1

试试这个：-

 FIRDatabase.database().reference().child("user").child(FIRAuth.auth()!.currentUser!.uid).observeSingleEvent(of: .value, with: { (snapshot) in
            print(snapshot)
        }) {(error) in
            print(error.localizedDescription)
        }