如何动态地将json响应对象映射到实体? [英] how to dynamically map a json response object to an entity?

问题描述

我正在实现ng2，其中我的user.service.ts调用REST服务并返回json，如下所示:

I'm implementing ng2 where my user.service.ts calls a REST service and returns json like this:

getUser(id: number): Promise<User> {
    return this.http.get('http://localhost:4000/users/1')
        .toPromise()
        .then(response => response.json())
}

返回的对象如下:

{
   "Id":"1"
   "FirstName":"John"
   "LastName":"Smith"
}

我需要将其转换为如下所示的ng2用户实体:

I need to convert this into my ng2 user entity which looks like this:

export class User 
{
    Id: number;
    FirstName: string;
    LastName: string;
}

我想以最通用的方式来执行此操作，以便将其用作模式.例如，类似:

I'd like to do this in the most generic way that I can leverage as a pattern. For example, something like:

var user = userResponse.map(User);

我希望它使用反射或类似的动态技术，以便映射自动发生，而无需任何其他显式编码.在ng2中执行此操作的好方法是什么?

I'd like this to use reflection or similar dynamic technique so the mapping happens automatically without any additional explicit codng needed. What would be a good way to do this in ng2?

推荐答案

基于注释，您似乎想避免在类中使用构造函数.好吧，这里的最简单"解决方案是使用Object.assign():

Based on comments, seems you want to avoid having constructor in your class. Well, the "simplest" solution here is to use Object.assign():

getUser(id: number): Promise<User> {
  return this.http.get('http://localhost:4000/users/1')
    .map(res => Object.assign(new User(), res.json()))
    .toPromise()
}

现在您的数据是User的实例.

Now your data is an instance of User.

演示: http://plnkr.co/edit/Gzi6tjZzTizDhlMCD1y9?p=preview(检查控制台)

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