Swift:将来自Firestore子集合的数据存储到对象中，其中uid = uid

import Firebase

// 获取Firestore实例
let db = Firestore.firestore()

// 创建自定义对象模型
struct MyObject {
    var uid: String
    var name: String
    // 其他属性...
}

// 获取指定子集合的数据
db.collection("parentCollection").document("parentDocument").collection("childCollection").whereField("uid", isEqualTo: "uid").getDocuments { (snapshot, error) in
    if let error = error {
        print("获取数据失败：\(error.localizedDescription)")
        return
    }
    
    guard let documents = snapshot?.documents else {
        print("没有找到文档")
        return
    }
    
    var objects = [MyObject]()
    
    for document in documents {
        let data = document.data()
        let uid = data["uid"] as? String ?? ""
        let name = data["name"] as? String ?? ""
        
        let object = MyObject(uid: uid, name: name)
        objects.append(object)
    }
    
    // 存储到对象中
    // objects数组中包含了从Firestore子集合获取的数据
}