Question

我正在尝试将http响应映射到JSON，然后将该JSON的一部分映射到Ticket接口，因为它在我的故障单界面中有许多我不需要的值。我的应用程序编译没有任何问题，但是当我测试REST函数时，我得到以下运行时错误，我知道问题不在于后端，因为我能够成功控制日志响应。知道我在这里做错了吗？

My error:

    vendor.bundle.js:8137 Angular is running in the development mode. Call enableProdMode() to enable the production mode.
    main.bundle.js:553 TypeError: res.json(...).map is not a function
        at MapSubscriber.project (main.bundle.js:1330)
        at MapSubscriber._next (vendor.bundle.js:42853)
        at MapSubscriber.Subscriber.next (vendor.bundle.js:4709)
        at XMLHttpRequest.onLoad (vendor.bundle.js:47289)
        at ZoneDelegate.webpackJsonp.749.ZoneDelegate.invokeTask (polyfills.bundle.js:2478)
        at Object.onInvokeTask (vendor.bundle.js:9228)
        at ZoneDelegate.webpackJsonp.749.ZoneDelegate.invokeTask (polyfills.bundle.js:2477)
        at Zone.webpackJsonp.749.Zone.runTask (polyfills.bundle.js:2245)
        at XMLHttpRequest.ZoneTask.invoke (polyfills.bundle.js:2540)


My code:

    retrieveTicket(barcode: string) : Observable<any> {
          return this.http.get(`${this.API_URL}POS/RetrieveTicket/${barcode}`, this.options)
          .map((res: Response) => res.json().map(ticket => {          
                Object.assign({
                    ResponseCode: ticket.ResponseCode,
                    CustomError: ticket.CustomError,
                    ticketDate: ticket.POSTicket.Date,
                    ticketTime: ticket.POSTicket.EndTime,
                    cashierName: ticket.POSBarCode.POSCashier_Name,
                    tranNo: ticket.POSTicket.TranNo,
                    tranValue: ticket.POSTicket.ScanValue,
                    securityChecked: ticket.POSBarCode.SecurityChecked
                }) as ITicket})         
          )
          .catch((error: any) => Observable.throw(error || 'server error'));
      } 


 my interface:

        import { BaseRequestInterface } from './base-request.interface';

        export interface ITicket extends IBaseRequest {
            ticketDate: string;
            ticketTime: string;
            cashierName: string;
            tranNo: string;
            tranValue: string;
            timeSincePurchase: string;
            securityChecked: boolean;

            export function setTicket(obj?: any) {
                super();
                this.ResponseCode = obj && obj.ResponseCode || null;
                this.CustomError = obj && obj.CustomError || null;
                this.ticketDate = obj && obj.ticketDate || null;
                this.ticketTime = obj && obj.ticketTime || null;
                this.cashierName = obj && obj.cashierName || null;          
                this.tranNo = obj && obj.tranNo || null;
                this.tranValue = obj && obj.tranValue || null;
                this.timeSincePurchase = obj && obj.timeSincePurchase || null;
                this.securityChecked = obj && obj.securityChecked || null;
            }


        }

my BaseRequest Interface:

//  Base request class that returns from BRMService API
export interface IBaseRequest {
    //  Public properties available
     BaseURI?: string;
     CustomError?: string;
     ProviderName?: string;
     RequestFormData?: string;
     RequestURI?: string;
     ResponseCode?: number;    
}

Answer 1

修改

我们了解到我们只处理一个Object而不是一个对象数组，因此将对象映射到类型TicketModel将像下面这样（缩短）：

retrieveTicket(barcode: string) { return this.http.get(...) .map(res => res.json()) .map(res => ({ResponseCode:res.ResponseCode, CustomError:res.CustomError}) as TicketModel) }

界面：

export interface TicketModel { ResponseCode: number; CustomError:string }

<强> DEMO

原始帖子：

不清楚你是否使用TicketModel的类或界面，无论如何我建议你使用界面;）然后你可以简单地映射你的传入数据，如（缩短版本）：

.map((res:Response) => res.json().map(x => Object.assign({ResponseCode: x.ResponseCode, CustomError:x.CustomError}) as TicketModel)))

如果您的回复是包含内部items的数组的对象，只需添加items：

.... res.json().items.map( ...

将HTTP响应映射到JSON然后将JSON映射到模型的问题

1 个答案: