角度2.将http响应映射到具体对象实例 [英] Angular2. Map http response to concrete object instance

问题描述

用于处理http响应的通用方法如下:

Сommon approach to process http response is like that:

return this._http.get(url)
           .map((res: Response) => res.json());

为您提供Observable<Object[]>，其中Object是根据json反序列化动态创建的类型. 然后您可以在*ngFor="let item of result | async"等中使用此结果...

which provides you with an Observable<Object[]> where Object is dynamically created type from json de-serialization. Then you can use this result in *ngFor="let item of result | async" etc...

我想获取一个特定的类型实例(意味着使用new运算符来调用类型的构造函数). 尝试了不同的方法来实现这样的目标:

I'd like to get a specific type instance (meaning using new operator to call the type's constructor). Tried different ways to achieve something like that:

.map((res: Response) => { let obj = res.json(); return new MyObject(obj.id, obj.name);})

但出现此错误:Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays.

这种方法似乎可行，但是它太复杂了，可能无效:

This way seems to work but it's way too complicated and probably not effective:

.map((res: Response) => {
    let results = <MyObject[]>[];
    let obj = res.json();
    obj.forEach(
        function (o: any) {
            results.push(new MyObject(o.id, o.name));
        }
    );
    return results;
}

谢谢！

推荐答案

.map((res: Response) => res.json().map(obj => new MyObject(obj.id, obj.name)))

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