我想将数据从 RealtimeDatabase 打印到 FirestoreDatabase。但是，有一个问题。当我用for返回它时，我不时收到以下错误。

错误：

The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions

如何以最短的方式执行此操作而不使用 For 返回？

我可以在不写 [String : Any] 的情况下将数据设置到数据库中吗？我怎样才能以最短的方式做到这一点？我喜欢这种方法，因为我的 for 操作不起作用。

Firestore：

Firestore.firestore().collection("users").document(user.uid).setData(
      [question.title ?? "" : [["title" : question.title ?? ""],["question" : question.test?.compactMap({$0.question})],["isQuestionImage" : question.test?.compactMap({$0.isQuestionImage})],["isSectionImage" : question.test?.compactMap({$0.isSectionImage})],["imageURL" : question.test?.compactMap({$0.imageURL})],["test" : [["sections" : [
                                  "A" : question.test?.compactMap({$0.sections?.A}),"B" : question.test?.compactMap({$0.sections?.B}),"C" : question.test?.compactMap({$0.sections?.C}),"D" : question.test?.compactMap({$0.sections?.D})
                               ]]
                               ]],["correct" : question.test?.compactMap({$0.correct})]
 
      ]],merge: true)

问题模型：

struct QuizContainer: Codable,Hashable {
    let allQuiz: [Quiz]?
}

struct Quiz: Codable,Hashable {
    let title: String?
    let test: [Test]?
}

struct Test: Codable,Hashable {
    let id: Int?
    let question: String?
    let isQuestionImage,isSectionImage: Bool?
    let imageName: String?
    let sections: Sections?
    let correct: String?
}

struct Sections: Codable,Hashable {
    let A,B,C,D: String?

    enum CodingKeys: String,CodingKey {
        case A = "A"
        case B = "B"
        case C = "C"
        case D = "D"
    }
}

用户模型：

struct User: Codable {
    var uid: String
    var questions: QuizContainer?
    var wrongQuestions: [Test]?
}

功能：

func foo(user: User) {
        Database.database().reference().observeSingleEvent(of: .value) { snapshot in
            
            do {
                let questions = try FirebaseDecoder().decode(QuizContainer.self,from: snapshot.value ?? "")
                for question in questions.allQuiz ?? [] {
                    
                    Firestore.firestore().collection("users").document(user.uid).setData(
                        [question.title ?? "" : [["title" : question.title ?? ""],["test" : [["sections" : [
                                                    "A" : question.test?.compactMap({$0.sections?.A}),"D" : question.test?.compactMap({$0.sections?.D})
                                                 ]]
                                                 ]],["correct" : question.test?.compactMap({$0.correct})]
                                                 
                        ]],merge: true)
                    
                }
            } catch {
                print(error.localizedDescription)
            }
        }
    }