做关联有更好的方法吗？例如：产品有很多图片和很多部分

Question

我目前有一个工作代码，但我想知道是否有更好的方法在Angular 2中实现关系。以下是我的课程：

import { Picture } from '../picture/picture';
import { Part } from '../part/part';

export class Product {
    constructor(
        public title: string,
        public imageUrl: string,
        public description: string,
        public price: number,
        public productId?: string,              
        public pictures?: [Picture],
        public parts?: [Part]){}
}
//The same code for Part Class:
export class Picture {

    constructor(
        public name: string, 
        public pictureUrl: string,
        public productId?: string,
        public pictureId?: string){}
}

以下是我的product.service，只是为了获得所有产品：

getProducts() {
  return this._http.get('http://localhost:3000/product')
    .map(response => {
      const data = response.json().obj; // from server route
      let objs: any[] = [];
      for (let i = 0; i < data.length; i++) {
        let product = new Product(data[i].title, data[i].imageUrl, 
        data[i].description, data[i].price, data[i].id, 
        data[i].pictures, data[i].parts);
        objs.push(product);
    }
    this.products = objs;
  })
 .catch(error => Observable.throw(error.json()));
}

提前多多感谢。