Question

我有这种JSON类型（只是一个简短示例）：

"orderProducts": [
        {
            "id": 135,
            "order_id": 39,
            "product_id": 49,
            "product_code": "",
            "size_id": 13,
            "quantity": 2,
            "product": {
                "id": 49,
                "code": "",
                "factory_id": 2,
                "product_category_id": 1,
                "sex_id": null,
                "season_id": null,
                "product_type_id": null,
                "type_id": null,
                "color_id": null,
                "year_id": null,
                "image_1": "bceef8b28ae2a1797ca0c6300021100d.jpeg",
                "image_2": "",
                "image_3": "",
                "notes": "",
                "status": 10
            }
        },
        {
            "id": 136,
            "order_id": 39,
            "product_id": 49,
            "product_code": "",
            "size_id": 14,
            "quantity": 3,
            "product": {
                "id": 49,
                "code": "",
                "factory_id": 2,
                "product_category_id": 1,
                "sex_id": null,
                "season_id": null,
                "product_type_id": null,
                "type_id": null,
                "color_id": null,
                "year_id": null,
                "image_1": "bceef8b28ae2a1797ca0c6300021100d.jpeg",
                "image_2": "",
                "image_3": "",
                "notes": "",
                "status": 10
            }
        },
        {
            "id": 137,
            "order_id": 39,
            "product_id": 48,
            "product_code": "",
            "size_id": null,
            "quantity": 24,
            "product": {
                "id": 48,
                "code": "",
                "factory_id": 2,
                "product_category_id": null,
                "sex_id": null,
                "season_id": null,
                "product_type_id": null,
                "type_id": null,
                "color_id": null,
                "year_id": null,
                "image_1": "2aee8660b4218bf549c2d9345beb2a01.jpeg",
                "image_2": "",
                "image_3": "",
                "notes": "",
                "status": 10
            }
        }]

我需要解析的项目是：product_id，size_id和quantity。为此，我创建了这个结构：

struct Products {
    let id: String
    let quantities: [(sizeId: String, quantity: String)]?

    init(id: String, quantities: [(sizeId: String, quantity: String)]) {
        self.id = id
        self.quantities = quantities
    }
}

我想要达到的最终结果是：

[Products(id: "49", quantities: [(sizeId: "13", quantity: "2"), (sizeId: "14", quantity: "3")]), 
Products(id: "48", quantities: [(sizeId: "null", quantity: "24")])]

使用SwiftyJSON解析时，我这样做：

for productId in products.arrayValue {
                        self.productWithQuantites.append(Products(id: productId["product_id"].stringValue,
                                                                  quantities: [(sizeId: productId["size_id"].stringValue,
                                                                                quantity: productId["quantity"].stringValue)]))

                    }

但是我明白了：

    [Products(id: "49", quantities: [(sizeId: "13", quantity: "2")]),
Products(id: "49", quantities: [(sizeId: "14", quantity: "3")],
Products(id: "48", quantities: [(sizeId: "null", quantity: "24")])]

我做错了什么？如何将新数量添加到现有元素中？感谢代码示例或任何帮助。

Answer 1

在Swift 4中，SwiftyJSON已过时，而受Codable协议的支持。

不要在结构中使用元组，请分隔值并将Product（最好为单数形式）实例分组为字典，具体取决于产品ID。

假设data包含JSON原始数据，创建这些微小的结构

struct Root : Decodable {
    let orderProducts : [Product]
}

struct Product: Decodable {
    let id : Int
    let productId : Int
    let sizeId : Int?
}

将JSON解码为结构并将数组与Dictionary(grouping:by:)

分组

do {
   let decoder = JSONDecoder()
   decoder.keyDecodingStrategy = .convertFromSnakeCase
   let result = try decoder.decode(Root.self, from: data)
   let groupedDictionary = Dictionary(grouping: result.orderProducts, by: {$0.productId})
   print(groupedDictionary)
   // [49: [Product(id: 135, productId: 49, sizeId: Optional(13)), 
   //      Product(id: 136, productId: 49, sizeId: Optional(14))], 
   //  48: [Product(id: 137, productId: 48, sizeId: nil)]]

} catch { print(error) }

Answer 2

要在这样的循环中进行更轻松的修改，应将Products设为一个类，因为它是通过引用传递的。另外，将quantities中的var设为Products，并将解析代码替换为：

for product in products.arrayValue {
    let productId = product["product_id"].stringValue

    let quantity = (sizeId: product["size_id"].stringValue,
                    quantity: product["quantity"].stringValue)

    if let product = self.productWithQuantites.filter({ $0.id == productId }).first {
        product.quantities?.append(quantity)
    } else {
        self.productWithQuantites.append(Products(id: productId, quantities: [quantity]))
    }
}

此代码将新的元组附加到现有产品的quantities属性，或者如果不存在，则创建新的Products并将其附加到productWithQuantites。

Answer 3

这样接收是正常的，因为在您的JSON中有两个条目，"product_id": 49

因此，您可以在解析json之后解决此问题，方法是一次找到多个相同项，一次删除两个for循环，如下所示：

for i in 0..<productWithQuantites.count {
        for j in 0..<productWithQuantites.count {
            if productWithQuantites[i].productID == productWithQuantites[j].productID {
                productWithQuantites.remove(at: j)
            }
        }
    }

Answer 4

您应该将Alamofire与JSONDecoder结合使用，而不是swiftyjson，更多参考可以观看此视频，该视频在此链接https://m.youtube.com/watch?v=YY3bTxgxWss

中可用

使用SwiftyJSON

4 个答案: