改变内对象属性来在打字原稿阵列

Question

有这样的问题，我一直在折磨的几天，我还是相当新手。

使用GET请求，维基百科的API，我得到this object

事实证明，对于网页对象，属性的名称（这也是一个对象）总是等于的pageid（在这种情况下，“9475”）。我如何才能访问这个对象，如果我事先不知道什么名字将有多少？

然后该对象必须被转换成阵列，使得可以使用ngFor。

这个对象我开始使用showArticleInformation方法search.component.ts

search.component.ts

import { Component, OnInit } from '@angular/core';
import { Article, ArticleInformation, ArticlesService } from '../../services/articles.service';

@Component({
  selector: 'app-search',
  templateUrl: './search.component.html',
  styleUrls: ['./search.component.css'],
  providers: [ArticlesService]
})

export class SearchComponent implements OnInit {
  constructor(private articlesServices: ArticlesService) { }

  searchQuery: string;

  articles: { };
  articleInformation: ArticleInformation;

  getUrl(searchQuery: string) {
    return 'https://ru.wikipedia.org/w/api.php?action=opensearch&profile=strict&search='
      + searchQuery + '&limit=100&namespace=0&format=json&origin=*';
  }

  getUrlInformation(searchQuery: string) {
    return 'https://ru.wikipedia.org/w/api.php?action=query&titles='
      + searchQuery + '&prop=info&format=json&origin=*';
  }

  showArticles() {
    this.articlesServices.getArticles(this.getUrl(this.searchQuery))
      .subscribe(
        (data: Article) => this.articles = Object.values({ ...data })
      );
  }

  showArticleInformation() {
    this.articlesServices.getArticleInformation(this.getUrlInformation(this.searchQuery))
      .subscribe(
        (data: ArticleInformation) => this.articleInformation = { ...data }
      );
    console.log(this.articleInformation);
  }

  ngOnInit() {
  }
}

articles.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { retry } from 'rxjs/operators';

export interface Article {
  title: string;
  collection: string[];
  description: string[];
  links: string[];
}

export interface ArticleInformation {
  batchComplete: string;
  query: {
    pages: { }
  };
}

@Injectable({
  providedIn: 'root'
})

export class ArticlesService {
  constructor(private http: HttpClient) { }

  getArticles(url) {
    return this.http.get<Article>(url)
      .pipe(
        retry(3),
      );
  }

  getArticleInformation(url) {
    return this.http.get<ArticleInformation>(url)
      .pipe(
        retry(3),
      );
  }
}

Answer 1

如果你确信pages总会有一个属性，你只需要它的value，你可以做这样的事情使用Object.values：

const data = {
  batchComplete: "",
  query: {
    pages: {
      "9745": {
        pageid: 9745,
        length: 48,
        lastrevid: 100,
        contentmodel: "wikitext",
        touched: "2019-02-01"
      }
    }
  }
}

const articleInformation = {
  ...data,
  query: {
    pages: [Object.values(data.query.pages)[0]]
  }
}

console.log(articleInformation)

但是，你需要有interface独立this.articleInformation和data因为它们具有不同的结构。

事情是这样的：

export interface ArticleInformationNew {
  batchComplete: string;
  query: {
    pages: any[]
  };
}