[英]how to convert from json to angular class
我有一堂課叫角書
export class Book
{
name: String;
auther: String;
series: String;
price: Number;
publishDate: Date;
ISBN: Number;
promise: String;
active: boolean;
}
並使用httpClient像這樣從服務器(以json格式)獲取圖書的數據
this.http.get(this.booksUrl)
.subscribe(res => console.log(res));
我想從json轉換為book類,是否有用於此的包? 如果我怎么能從json對象中提取數據
更新:這是我得到的json數據
ISBN:"req.body.ISBN"
author:"req.body.author"
created_at:"2018-08-06T11:53:07.532Z"
name:"a"
photo:""
publishDate:"2018-08-06T11:53:07.532Z"
sellDate:"2018-08-06T11:53:07.532Z"
seller:"req.body.seller"
seriesName:"4"
summary:"req.body.summary"
updated_at:"2018-08-06T11:53:17.629Z"
__v:0
_id:"5b6836aa5d6e0a2c481fbd04"
您可以使用一個簡單的構造函數來接收如下對象:
export class Book
{
name: String;
auther: String;
series: String;
price: Number;
publishDate: Date;
ISBN: Number;
promise: String;
active: boolean;
constructor(obj: any) {
this.name = obj.name;
this.auther = obj.auther;
this.publishDate = new Date(obj.publishDate);
}
}
然后像這樣更新您的請求:
this.http.get(this.booksUrl)
.subscribe(res => new Book(res));
顯然,我認為您會將新創建的Book與實例相關聯,例如:
book: Book;
this.http.get(this.booksUrl)
.subscribe(res => {
this.book = new Book(res)
});
我最終使用了這段代碼
getBookList() {
return this.http.get<Book[]>(this.bookUrl + '/list')
.subscribe(bookRes => this.books = bookRes);
}
由於我在json中獲得了響應,因此此強制轉換能夠將json中具有相同名稱的任何對象強制轉換為Book。 例如,我在書中有一個author變量,因此只要它在json文檔中是相同的名稱,並且在book類中就可以對其進行轉換,但是如果在我的班級中,我將其稱為“ BooksAuthor”,因為與json文檔的名稱不同,我將無法強制轉換
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