如何將 firestore 文檔 ID 添加到我的模型並隨后添加到數組？

Question

我有一個結構“訂單”，其中包含一個名為 orderId 的字段：

protocol OrderSerializable {
    init?(dictionary:[String:Any])
}

struct Order {
    var orderId: String
    var status: Int
    var currentTotal: Double

    var Dictionary:[String : Any] {
        return [
            "orderId": orderId,
            "status": status,
            "currentTotal": currentTotal
        ]
    }
}

extension Order : OrderSerializable {
    init?(dictionary: [String : Any]) {
        guard let orderId = dictionary["orderId"] as? String,
        let status = dictionary["status"] as? Int,
        let currentTotal = dictionary["currentTotal"] as? Double

        else { return nil }

        self.init(orderId: orderId, status: status, currentTotal: currentTotal)
    }
}

我需要將 firestore 文檔 Id 添加到模型數組中的 orderId 字段，即“ordersArray”。 我該怎么做？

到目前為止，這是我的查詢代碼，我已經指出了我需要的行：

orderRef.getDocuments() {
            querySnapshot, error in
            if let error = error {
                print("\(error.localizedDescription)")
            } else {
                guard let documents = querySnapshot?.documents else { return }
                for document in documents {
                    let orderDictionary = document.data() as [String : Any]
                    let order = Order(dictionary: orderDictionary)
                    // Here I want to append the firestore documentId to order.orderId before appending it to the array
self.ordersArray.append(order!)

                }
                DispatchQueue.main.async {
                    self.ordersTableView?.reloadData()
                }
            }
        }

提前致謝。

不同的錯誤

Answer 1

修改您的擴展以接受documentId作為附加參數，並將其傳遞給創建的 Order 對象。

protocol OrderSerializable {
    init?(dictionary:[String:Any], id: String)
}
extension Order : OrderSerializable {
    init?(dictionary: [String : Any], id: String) {
        guard let status = dictionary["status"] as? Int,
        let currentTotal = dictionary["currentTotal"] as? Double
        else { return nil }

        self.init(orderId: id, status: status, currentTotal: currentTotal)
    }
}

然后，當您創建每個訂單時，將documentId作為id參數傳遞。

orderRef.getDocuments() {
            querySnapshot, error in
            if let error = error {
                print("\(error.localizedDescription)")
            } else {
                guard let documents = querySnapshot?.documents else { return }
                for document in documents {
                    let orderDictionary = document.data() as [String : Any]
                    let order = Order(dictionary: orderDictionary, id: document.documentId)
                    self.ordersArray.append(order!)

                }
                DispatchQueue.main.async {
                    self.ordersTableView?.reloadData()
                }
            }
        }

或者，您可以將orderId直接存儲在文檔本身中，以便將其與字典一起傳入，從而避免使用documentId 。