我如何获取 Firebase 文档的名称？ Swift

Question

如何直接从登录用户的信息中获取 Firebase 文档的名称？

基本上我有一个用户集合和一个学位课程集合。

当我使用函数时 GetCorsodiLaurea

我不想在.document("")中手动插入文档名称但我想直接从用户信息中自动获取文档名称声明哪个课程连接到用户的字段是“TipoCorso”。正如您在学位课程集合中所见，“TipoCorso”字段的值

这是函数的代码和 Firebase 数据库的屏幕：

  import SwiftUI
  import Firebase
  import FirebaseFirestoreSwift
  import FirebaseDatabase


  class ProfileViewModel : ObservableObject{
@Published var userInfo = UserModel(Nome: "", Cognome: "", photoURL: "", Nomeintero: "", Corsodilaurea: "", Tipocorso: "")
@Published var userDegree = userDegreeModel(Name: "", TotalSubjects: "")

var ref = Firestore.firestore()
let uid = Auth.auth().currentUser!.uid
let db = Firestore.firestore()



init() {
    fetchUser()
    GetCorsodiLaurea()
}

func fetchUser() {
    
    ref.collection("users").document(uid).getDocument { [self] (doc, err) in guard let user = doc else { return }
    
        
        
        let Nome = user.data()?["Nome"] as! String
        let Cognome = user.data()?["Cognome"] as! String
        let photoURL = user.data()?["photoURL"] as! String
        let Nomeintero = user.data()?["Nomeintero"] as! String
        let Tipocorso = user.data()?["Tipocorso"] as! String
        let Corsodilaurea = user.data()?["Corsodilaurea"] as! String
        
        
        DispatchQueue.main.async {
            self.userInfo = UserModel(Nome: Nome, Cognome: Cognome, photoURL: photoURL, Nomeintero: Nomeintero, Corsodilaurea: Corsodilaurea, Tipocorso: Tipocorso)            }
    }
    
}

func GetCorsodiLaurea() {
    db.collection("DegreeCourses").document(self.userInfo.Tipocorso).getDocument { [self] (doc, err) in guard let DegreeCourses = doc else { return }
    let Name = DegreeCourses.data()?["Name"] as! String
    let TotalSubjects = DegreeCourses.data()?["TotalSubjects"] as! String
        
           // [END doc_reference]
           // [END collection_reference]
    DispatchQueue.main.async {
    self.userDegree = userDegreeModel(Name: Name, TotalSubjects: TotalSubjects)
    }
        
    }

    
}





}

User

DegreeCourses

Answer 1

当您调用 fetchUeser() 函数时，您似乎正在使用特定用户的 Tipocorso 填充 UserModel。

因此在 GetCorsodiLaurea 函数中您可以调用 userInfo 变量中的 Tipocorso 成员。

ref.collection("DegreeCourses").document(self.userInfo.Tipocorso).getDocument { [self] (doc, err) in guard let DegreeCourses = doc else { return }

编辑：您很可能收到错误，因为 fetchUsers() 函数尚未完全完成（因为它正在等待 Firebase 响应）但执行已经完成继续执行 GetCorsodiLaurea() 函数。

要解决此问题，请添加 escaping closure 到 fetchUsers() 函数并在闭包中调用 GetCorsodiLaurea() 函数。这样，编译器就不会尝试异步执行函数。

  import SwiftUI
  import Firebase
  import FirebaseFirestoreSwift
  import FirebaseDatabase


  class ProfileViewModel : ObservableObject{
@Published var userInfo = UserModel(Nome: "", Cognome: "", photoURL: "", Nomeintero: "", Corsodilaurea: "", Tipocorso: "")
@Published var userDegree = userDegreeModel(Name: "", TotalSubjects: "")

var ref = Firestore.firestore()
let uid = Auth.auth().currentUser!.uid
let db = Firestore.firestore()



init() {
    //GetCorsodilaurea() will only get called after fetchUser() is complete
    fetchUser(completion: {
      GetCorsodiLaurea()
    })
    
}

func fetchUser(completion: @escaping () -> Void)) {
    
    ref.collection("users").document(uid).getDocument { [self] (doc, err) in guard let user = doc else { return }
    
        
        
        let Nome = user.data()?["Nome"] as! String
        let Cognome = user.data()?["Cognome"] as! String
        let photoURL = user.data()?["photoURL"] as! String
        let Nomeintero = user.data()?["Nomeintero"] as! String
        let Tipocorso = user.data()?["Tipocorso"] as! String
        let Corsodilaurea = user.data()?["Corsodilaurea"] as! String
        
        //don't do this async
        self.userInfo = UserModel(Nome: Nome, Cognome: Cognome, photoURL: photoURL, Nomeintero: Nomeintero, Corsodilaurea: Corsodilaurea, Tipocorso: Tipocorso)    
        completion()
    }
    
}

func GetCorsodiLaurea() {
    db.collection("DegreeCourses").document(self.userInfo.Tipocorso).getDocument { [self] (doc, err) in guard let DegreeCourses = doc else { return }
    let Name = DegreeCourses.data()?["Name"] as! String
    let TotalSubjects = DegreeCourses.data()?["TotalSubjects"] as! String
        
           // [END doc_reference]
           // [END collection_reference]
    DispatchQueue.main.async {
    self.userDegree = userDegreeModel(Name: Name, TotalSubjects: TotalSubjects)
    }
        
    }

    
}

我如何获取 Firebase 文档的名称？ Swift

How do I take the name of the Firebase document? Swift

xcode

ios

firebase

swift

swiftui