如何将数据添加到 Firestore 数据库中的特定 uid？

Question

我想要一些关于如何在用户成功登录后将数据存储到特定用户的编码方面的帮助。下面是用户可以输入新读数详细信息的页面的代码。

import UIKit
import Firebase
import FirebaseAuth
import FirebaseFirestore

class NewBookViewController: UIViewController {

    @IBOutlet weak var bookTitleTextField: UITextField!
    @IBOutlet weak var bookAuthorTextField: UITextField!
    @IBOutlet weak var bookSummaryTextField: UITextField!
    
    @IBOutlet weak var ratingController: UIView!
    
    @IBOutlet weak var newBookCancelButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()

     
    }
    
   
    func validateFields() -> String? {
        
        
        if
            bookTitleTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) == "" ||
                bookAuthorTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) == "" ||
                bookSummaryTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines) == "" {
            return "Please fill in all the fields."
        }
        return nil
    }

    @IBOutlet weak var newBookSaveButton: UIButton!

    var ref = Firestore.firestore()
    
    @IBAction func newBookSaveButtonTapped(_ sender: Any) {
        
        let uid = Auth.auth().currentUser?.uid
        self.ref?.child("new reading").child(uid).setValue(post)
        
        func post() {
            let bookTitleTextField = "bookTitle"
            let bookAuthorTextField = "bookAuthor"
            let bookSummaryTextField = "bookSummary"
            
            let post : [String : AnyObject] = [ "bookTitle" : bookTitleTextField as AnyObject, "bookAuthor" : bookAuthorTextField as AnyObject, "bookSummary" : bookSummaryTextField as AnyObject]
            
        }
        

this is the successful user sign up on cloud firestore. after the user have logged in, I wanted to add those 3 data (title, author, summary) FOR the specific user.

Answer 1

看起来你很接近了。不过，现在，您不会从 post 返回任何东西。我认为您还意味着要从每个 UITextField 获取 text 值，而不是仅使用字段名称声明 Strings。

@IBAction func newBookSaveButtonTapped(_ sender: Any) {
  guard let uid = Auth.auth().currentUser?.uid else {
    //handle your error here
    return
  }
  self.ref?.child("new reading").child(uid).setValue(post())
}        

func post() -> [String:String] {
  return ["bookTitle" : bookTitleTextField.text ?? "", 
          "bookAuthor" : bookAuthorTextField.text ?? "", 
          "bookSummary" : bookSummaryTextField.text ?? ""]
}

Answer 2

您应该采取更安全的方法来处理用户 ID 和文本字段的值。在这里，只有当用户登录并且所有 3 个文本字段中都有字符串时，数据才会写入数据库。我不知道您打算将此文档放在哪个集合中，所以我选择了您编写的内容，但我怀疑它不正确。

class NewBookViewController: UIViewController {
    private let db = Firestore.firestore()

    @IBAction func newBookSaveButtonTapped(_ sender: Any) {
        guard let uid = Auth.auth().currentUser?.uid,
              let data = bookData() else {
                  return
              }
        db.collection("new reading").document(uid).setData(data)
    }
    
    // This returns an optional dictionary (nil when the data is incomplete).
    // This is entirely optional (pun) but I suspect you don't want
    // empty fields in these database documents.
    func bookData() -> [String: Any]? {
        guard let title = bookTitleTextField.text,
              let author = bookAuthorTextField.text,
              let summary = bookSummaryTextField.text else {
                  return nil
              }
        let data: [String: Any] = [
            "bookTitle": title,
            "bookAuthor": author,
            "bookSummary": summary
        ]
        return data
    }
}