Angular:Typescript 将 JSON 响应转换为对象模型不起作用 [英] Angular: Typescript casting JSON response as object model not working
问题描述
我在尝试将 json 响应转换为对象时遇到问题,对象的所有属性都是字符串,这正常吗?
I have an issue while I try to cast a json response to object, all the properties of my object are string is that normal ?
这是我的ajax请求:
Here is my ajax request :
public getSingle = (keys: any[]): Observable<Badge> => {
return this._http.get(this.actionUrl + this.getKeysUrl(keys))
.map((response: Response) => response.json() as Badge )
.catch(this.handleError);
}
这是我的徽章模型:
export interface Badge {
badgeNumber: number;
authorizationLevel: number;
endOfValidity: Date;
}
这里是我调用服务函数的地方,我遇到了这个问题:
And here is where I call the service function and I'm facing the issue :
this._badgeService.getSingle(this.ids).subscribe(
(badge: Badge) => {
console.log(typeof(badge.endOfValidity)); // <-- returning string and not Date
},
error => console.log(error);
});
推荐答案
解释起来有点棘手:
Date
是一个类,这意味着需要通过构造函数调用创建 Date 类型的值.换句话说,使用 new Date(...)
创建一个类实例.
Date
is a class, this means that values of type Date need to be created through a constructor call. In other words, create a class instance with new Date(...)
.
Response.json 方法只会返回一个 JSON 格式的对象,并且不包含任何类的实例,只包含 key:property 的映射.
The Response.json method will only return an object in JSON format, and such doesnt contain an instance of any class, only maps of key:property.
所以你需要做的,是手动将 .json() 返回的值转换为 Base 对象.这可以按如下方式完成:
So what you need to do, is to manually convert the value returned from .json() to a Base object. This can be done as follows:
public getSingle = (keys: any[]): Observable<Badge> => {
return this._http.get(this.actionUrl + this.getKeysUrl(keys))
.map(r => r.json())
.map(v => <Badge>{
badgeNumber: v.badgeNumber,
authorizationLevel: v.authorizationLevel,
endOfValidity: new Date(v.endOfValidity)
// preferably this string should be in ISO-8601 format
})
//the mapping step can be done in other ways most likely
.catch(this.handleError);
}
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