Yelp API 業務詳細信息端點

Question

能夠從業務匹配端點檢索業務 ID 后，我現在嘗試使用該業務 ID 將其匯集到業務詳細信息端點。 我只是在學習調用 API，所以請耐心等待。 謝謝！

以下代碼允許我進行業務匹配：

調用 API -->

import Foundation
import Moya


private let apiKey = ""


enum YelpService {
    enum BusinessMatch: TargetType {
        case match(name: String, address1: String, city: String, state: String, country: String)

        public var baseURL: URL { return NSURL(string: "https://api.yelp.com")! as URL
        }


        public var path: String {
            switch self {
            case .match:
                return "/v3/businesses/matches"
            }
        }

        var method: Moya.Method {
            return.get
        }

        var sampleData: Data {
            return Data()
        }

        var task: Task {
            switch self {
            case let .match(name, address1, city, state, country):
                return .requestParameters(parameters: ["name": name, "address1": address1, "city": city, "state": state, "country": country, "limit": 1], encoding: URLEncoding.queryString)
            }
        }

        var headers: [String : String]? {
            return ["Authorization": "Bearer \(apiKey)"]
        }
}
}

返回業務匹配端點 -->

import UIKit
import CoreData
import Moya

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    let service = MoyaProvider<YelpService.BusinessMatch>()


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:[UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        service.request(.match(name: "Sushi Damo", address1:
            "330 W 58th St", city: "New York", state: "NY", country: "US")) { (result) in
                switch result {
                case .success(let response):
                    print(try? JSONSerialization.jsonObject(with: response.data, options: []))
                case .failure(let error):
                    print("Error: \(error)")
                }
        }
        return true
}




    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }

    // MARK: - Core Data stack

    lazy var persistentContainer: NSPersistentContainer = {
        /*
         The persistent container for the application. This implementation
         creates and returns a container, having loaded the store for the
         application to it. This property is optional since there are legitimate
         error conditions that could cause the creation of the store to fail.
        */
        let container = NSPersistentContainer(name: "APITest")
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

                /*
                 Typical reasons for an error here include:
                 * The parent directory does not exist, cannot be created, or disallows writing.
                 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
                 * The device is out of space.
                 * The store could not be migrated to the current model version.
                 Check the error message to determine what the actual problem was.
                 */
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        return container
    }()

    // MARK: - Core Data Saving support

    func saveContext () {
        let context = persistentContainer.viewContext
        if context.hasChanges {
            do {
                try context.save()
            } catch {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }
    }
}

致電業務匹配端點后，我收到以下信息：

Optional({
    businesses =     (
                {
            alias = "sushi-damo-new-york";
            coordinates =             {
                latitude = "40.76778";
                longitude = "-73.98358";
            };
            "display_phone" = "(212) 707-8609";
            id = J85NKgA4tOgBAoqxu0vBNw;
            location =             {
                address1 = "330 W 58th St";
                address2 = "";
                address3 = "";
                city = "New York";
                country = US;
                "display_address" =                 (
                    "330 W 58th St",
                    "New York, NY 10019"
                );
                state = NY;
                "zip_code" = 10019;
            };
            name = "Sushi Damo";
            phone = "+12127078609";
        }
    );
})

我希望能夠從任何業務匹配結果中自動提取該業務 ID。 問題出在以下代碼中。

調用 API -->

enum YelpDetails {
    enum BusinessDetail: TargetType {
        case BusinessID(id: String)

        public var baseURL: URL { return NSURL(string: "https://api.yelp.com")! as URL
        }

        public var path: String {
            switch self {
            case .BusinessID:
                return "https://api.yelp.com/v3/businesses/{id}"
            }
        }

        var method: Moya.Method {
            return.get
        }

        var sampleData: Data {
            return Data()
        }

        var task: Task {
            switch self {
            case let .BusinessID(id):
                return .requestParameters(parameters: ["BusinessID": id], encoding: URLEncoding.queryString)
            }
        }

        var headers: [String : String]? {
            return ["Authorization": "Bearer \(apiKey)"]
        }
    }
}

從業務詳細信息端點返回結果 -->

   let information = MoyaProvider<YelpDetails.BusinessDetail>()

    func call(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:[UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        information.request(.BusinessID(id: "J85NKgA4tOgBAoqxu0vBNw")) {
            (result) in
            switch result {
            case .success(let response):
                print(try? JSONSerialization.jsonObject(with:
                    response.data, options: []))
            case .failure(let error):
                print("Error: \(error)")
            }
        }
        return true
}

Answer 1

通常，當您從網絡中獲取 JSON 數據時，您想要做的是將其序列化為您可以在 Swift 中使用的對象。 幸運的是，Swift 有工具可以輕松地將 json 轉換為對象，然后再轉換回來，即Codable協議。 查看此視頻了解更多信息。 但本質上，這需要查看我們從服務器獲得的響應並創建一個反映該響應的struct或class 。 因此，在您的情況下，從服務器返回的原始 json 如下所示：

{
    "businesses": [
        {
            "id": "J85NKgA4tOgBAoqxu0vBNw",
            "alias": "sushi-damo-new-york",
            "name": "Sushi Damo",
            "coordinates": {
                "latitude": 40.76778,
                "longitude": -73.98358
            },
            "location": {
                "address1": "330 W 58th St",
                "address2": "",
                "address3": "",
                "city": "New York",
                "zip_code": "10019",
                "country": "US",
                "state": "NY",
                "display_address": [
                    "330 W 58th St",
                    "New York, NY 10019"
                ]
            },
            "phone": "+12127078609",
            "display_phone": "(212) 707-8609"
        }
    ]
}

這是一個包含一個關鍵businesses的字典，它具有一組字典的值，其中包含描述業務的鍵值對。 對於上面的 JSON，數組中只有一個元素。

所以現在我們對響應的樣子有了一些了解，我們可以開始創建一些符合Codable結構。 我們知道我們需要一個帶有屬性businesses頂級struct ，它是一個包含描述每個業務的結構的數組。

struct BusinessesResponse: Codable {
    let businesses: [BusinessResponse]
}

接下來創建BusinessResponse 。 現在，如果您只關心id ，則可以將BusinessResponse設為：

struct BusinessResponse: Codable {
    let id: String
}

然后在此處更新您的回復方式：

    service.request(.match(name: "Sushi Damo", address1:
            "330 W 58th St", city: "New York", state: "NY", country: "US")) { (result) in
                switch result {
                case .success(let response):
                    print(try? JSONSerialization.jsonObject(with: response.data, options: []))
                case .failure(let error):
                    print("Error: \(error)")
                }
        }

與其將我們想要解碼的 JSON 對象序列化為我們的BusinessesResponse結構，我們可以通過將switch語句更新為：

switch result {
case .success(let response):
    let businessesResponse = try? JSONDecoder().decode(BusinessesResponse.self, from: response.data)
    let firstID = businessesResponse?.businesses.first?.id
    // Do something with ID
case .failure(let error):
    print("Error: \(error)")
}

我認為下一個請求不會按書面形式進行。 在此請求中，通過 URL 路徑發送參數，即企業的 id。 所以， path應該是：

       public var path: String {
            switch self {
            case let .BusinessID(id):
                return "v3/businesses/\(id)"
            }
        }

因此task不再需要處理參數，應該是：

        var task: Task {
            switch self {
            case .BusinessID:
                return .requestParameters(parameters:[:], encoding: URLEncoding.queryString)
            }
        }