Xcode 中的 Firebase 身份验证和实时数据库：如何仅显示与一个用户相关的数据而不是全部？

Question

在使用 Firebase 身份验证和实时数据库的 xcode 中，我正在尝试创建一个基于信息的应用程序，用户登录并查看已经放入实时数据库而不是整个数据库的信息。

如何将 Auth 与数据库链接？ 这是我当前数据库的样子：

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我有两个viewController，一个用于登录，一个用于登录：

这是我的登录页面代码：

import UIKit
import Firebase

class LoggedInViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {


    @IBOutlet weak var loginlbl: UILabel!

    @IBOutlet weak var tbl: UITableView!

    var ref: DatabaseReference!
    var jobList = [JobModel]()

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

        let job = jobList[indexPath.row]

        let alertController = UIAlertController(title:job.shipper, message:"Update", preferredStyle:.alert)


        let deleteAction = UIAlertAction(title: "Delete", style:.default){(_) in
               //self.deleteAction(job: job!)
        }
        let updatedAction = UIAlertAction(title: "Update", style:.default){(_) in

            let id = job.id

            let collected = alertController.textFields?[0].text
            let delievered = alertController.textFields?[1].text

           // ref.child("job").setValue("collected")
            //self.update(collected: collected!, delievered: delievered!)

        }

        alertController.addTextField{(textField) in
            textField.text = job.delievered

        }
        alertController.addTextField{(textField) in
            textField.text = job.collected

        }

        alertController.addAction(updatedAction)

        alertController.addAction(deleteAction)

        present(alertController, animated: true, completion: nil)
    }


    func updatedJob(id: String, collected: String, delievered: String){
        let job = [
            "id": id,
            "collected": collected,
            "delivered": delievered]

        ref.child(id).setValue(job)

    }


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
       let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ViewControllerTableViewCell

        let job: JobModel

        job = jobList[indexPath.row]

        cell.lblCol.text = job.collection
        cell.lblDel.text = job.delivery
        cell.lblShip.text = job.shipper
        cell.lblCon.text = job.consignee
        cell.lblEmai.text = job.email
        cell.lblRef.text = job.reference
        cell.lblFreight.text = job.freight
        cell.collected.text = job.collected
        cell.delivered.text = job.delievered

        return cell  }


func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return jobList.count
}

override func viewDidLoad() {

        super.viewDidLoad()

if FirebaseApp.app() == nil {
FirebaseApp.configure()     }


ref = Database.database().reference().child("jobs");

ref.observe(DataEventType.value) { (snapshot) in

if snapshot.childrenCount>0 {

self.jobList.removeAll()

for jobs in snapshot.children.allObjects as! [DataSnapshot]{
    let jobObject = jobs.value as? [String: AnyObject]
    let jobId = jobObject?["id"]
    let jobShipper = jobObject?["shipper"]
    let jobConsignee = jobObject?["consignee"]
    let jobEmail = jobObject?["email"]
    let jobReference = jobObject?["reference"]
    let jobFreight = jobObject?["freight"]
    let jobCollection = jobObject?["collection date"]
    let jobDelivery = jobObject?["delivery date"]
    let jobPod = jobObject?["pod"]
    let jobCollected = jobObject?["collected"]
    let jobDelivered = jobObject?["delivered"]

  let job = JobModel(id: jobId as! String?,
            shipper: jobShipper as! String?,
            consignee: jobConsignee as! String?,
            email: jobEmail as! String?,
            reference: jobReference as! String?,
            freight: jobFreight as! String?,
            collection: jobCollection as! String?,
            delivery: jobDelivery as! String?,
            pod: jobPod as! String?,
            collected: jobCollected as! String?,
            delivered: jobDelivered as! String?)

            self.jobList.append(job)
}
            self.tbl.reloadData()

这是我的登录页面代码：

import UIKit
import Firebase
import FirebaseAuth

class LoginViewController: UIViewController {

    static var isAlreadyLaunchedOnce = false

    @IBOutlet weak var txtemail: UITextField!

    @IBOutlet weak var txtpass: UITextField!


    var isSignin:Bool = true

    override func viewDidLoad() {
        super.viewDidLoad()

       if FirebaseApp.app() == nil {
        FirebaseApp.configure()
       }
    }


    @IBAction func submit(_ sender: UIButton) {

        if let email = txtemail.text, let passowrd = txtpass.text

        { Auth.auth().signIn(withEmail: email, password: passowrd) { (user, error) in
                if user != nil {
                    self.performSegue(withIdentifier: "goto", sender : self)
                }
                else {
                    let alert = UIAlertController(title: "Username or Password Incorrect", message: nil, preferredStyle: .alert)
                    let okButton = UIAlertAction(title: "Ok", style: .default, handler: nil)
                    alert.addAction(okButton)
                    self.present(alert, animated: true, completion: nil)
                }
            }
        }
}
}

所以我的问题是如何使用 firebase 登录到我的数据库，但只看到每个登录的相关信息而不是整个数据库，因为目前我在 tableView 中看到整个数据库。

Answer 1

正如 Dennin W 所说，您可能需要更改数据组织，在我看来，这并不复杂，您可以将 Auth UID 保存为作业对象的 id。

之后，您只需要查询您的数据库，如下所示：

let query = ref.queryEqual(toValue: Auth.auth().currentUser!.uid, childKey: "id")

这一行 Auth.auth().currentUser?.uid 检索登录用户的 uid，如果您更改了在数据库中保存 jobs 的方式此查询将检索与该 ID 匹配的子代。