大厦亲子物体内部认购方法

问题描述 投票：2回答：2

我有一个角状的部件，订阅了一个观察的，由角服务返回。

成分：help.component.ts

import { WikiService } from '../../../services/wiki.service';

import { WikiTree } from '../../../interfaces/WikiTree';

export class HelpComponent implements OnInit {

    wikiTree$: Observable<WikiTree>
    wikiChildTree$: Observable<WikiTree>

    public infoCards: Array<Object>;

    constructor(private wikiService: WikiService) {}

    ngOnInit() {
            this.wikiTree$ = this.wikiService.GetWikiHierarchy();
            this.wikiTree$.subscribe((data)=>{
            const newInfoCards = data.page.results.map(result => (
            {
              "image": "",
              "title": result.title,
              "titleLink": "/page/wiki/"+ result.id,
              "children": []  /*TODO: Populate this array with a Service call based on result.id*/
            }))
            this.infoCards = [...this.infoCards,...newInfoCards]
          },
          (err) => {
            console.log(err);
          }
       );
    }

该wikiTree$可观察具有以下JSON，转换成打字原稿：

{
    "page": {
        "results": [
            {
                "id": "123456789",
                "type": "page",
                "status": "current",
                "title": "Start here",
                "extensions": {
                    "position": 0
                },
                "_links": {
                    "webui": "/display/MYSPACE/Start+here",
                    "edit": "/pages/resumedraft.action?draftId=123456789",
                    "tinyui": "/x/BQD2Mw",
                    "self": "https://wiki.abc.com/rest/api/content/123456789"
                },
                "_expandable": {
                    "container": "/rest/api/space/MYSPACE",
                    "metadata": "",
                    "operations": "",
                    "children": "/rest/api/content/123456789/child",
                    "restrictions": "/rest/api/content/123456789/restriction/byOperation",
                    "history": "/rest/api/content/123456789/history",
                    "ancestors": "",
                    "body": "",
                    "version": "",
                    "descendants": "/rest/api/content/123456789/descendant",
                    "space": "/rest/api/space/MYSPACE"
                }
            },
            {
                "id": "567890123",
                "type": "page",
                "status": "current",
                "title": "FAQ",
                "extensions": {
                    "position": 1
                },
                "_links": {
                    "webui": "/display/MYSPACE/FAQ",
                    "edit": "/pages/resumedraft.action?draftId=567890123",
                    "tinyui": "/x/HQD2Mw",
                    "self": "https://wiki.abc.com/rest/api/content/567890123"
                },
                "_expandable": {
                    "container": "/rest/api/space/MYSPACE",
                    "metadata": "",
                    "operations": "",
                    "children": "/rest/api/content/567890123/child",
                    "restrictions": "/rest/api/content/567890123/restriction/byOperation",
                    "history": "/rest/api/content/567890123/history",
                    "ancestors": "",
                    "body": "",
                    "version": "",
                    "descendants": "/rest/api/content/567890123/descendant",
                    "space": "/rest/api/space/MYSPACE"
                }
            }
        ],
        "start": 0,
        "limit": 25,
        "size": 2,
        "_links": {
            "self": "https://wiki.abc.com/rest/api/content/998877665/child/page"
        }
    },
    "_links": {
        "base": "https://wiki.abc.com",
        "context": "",
        "self": "https://wiki.abc.com/rest/api/content/998877665/child"
    },
    "_expandable": {
        "attachment": "/rest/api/content/998877665/child/attachment",
        "comment": "/rest/api/content/998877665/child/comment"
    }
}

打字稿：WikiTree.ts

export interface WikiTree {
    page: Page;
    _links: Links;
    _expandable: Expandable;
  }
  export interface Page {
    results?: (ResultsEntity)[] | null;
    start: number;
    limit: number;
    size: number;
    _links: Links1;
  }
  export interface ResultsEntity {
    id: string;
    type: string;
    status: string;
    title: string;
    extensions: Extensions;
    _links: Links2;
    _expandable: Expandable1;
  }
  export interface Extensions {
    position: number;
  }
  export interface Links2 {
    webui: string;
    edit: string;
    tinyui: string;
    self: string;
  }
  export interface Expandable1 {
    container: string;
    metadata: string;
    operations: string;
    children: string;
    restrictions: string;
    history: string;
    ancestors: string;
    body: string;
    version: string;
    descendants: string;
    space: string;
  }
  export interface Links1 {
    self: string;
  }
  export interface Links {
    base: string;
    context: string;
    self: string;
  }
  export interface Expandable {
    attachment: string;
    comment: string;
  }

我想和基于它的服务的调用来填充children阵列的父result.id

例如：呼叫将在维基服务，它返回一个可观察的功能。

this.wikiChildTree$ = this.wikiService.GetWikiHierarchy(result.id);

从wikiChildTree$观察到返回的数据，我想创建title和link对象的数组。因此，对象的infoCards阵列将反映这样一个JSON对象：

[{
        "image": "",
        "title": "Start here",
        "titleLink": "/page/wiki/123456789",
        "children": [{
            "title": "Storm",
            "link": "/page/wiki/660431"
        },
        {
            "title": "Weather",
            "link": "/page/wiki/660432"
        }]
},
{
        "image": "",
        "title": "FAQ",
        "titleLink": "/page/wiki/567890123",
        "children": [{
            "title": "Cloud",
            "link": "/page/wiki/450433"
        },
        {
            "title": "Sunshine",
            "link": "/page/wiki/120432"
        }]
}
]

这就像制作父子异步调用，让孩子的数据。

我看了一下forkjoin和mergemap，但不知道在这里实现。我怎么做？

angular typescript angular5
2个回答
1
投票

所以基本上你应该能够做到这一点，如：

ngOnInit() {
       this.wikiTree$ = this.wikiService.GetWikiHierarchy().pipe(
          switchMap(data => 
             forkJoin(data.page.results.map(result => this.wikiService.GetWikiHierarchy(result.id))).pipe(
                map(children => ({data, children}))
             )
          )
       ).subscribe(({data, children}) => {
            const newInfoCards = data.page.results.map((result, i) => (
            {
              "image": "",
              "title": result.title,
              "titleLink": "/page/wiki/"+ result.id,
              "children": children[i]
            }))
            this.infoCards = [...this.infoCards,...newInfoCards]
          },
          (err) => {
            console.log(err);
          }
       );
}

说明：

  1. 您加载this.wikiService.GetWikiHierarchy（）;
  2. 您加载所有this.wikiService.GetWikiHierarchy（result.id）对于同时使用forkJoin每个结果。
  3. 您可以从两个地方你加载的数据映射为对象{数据，儿童}其中的数据 - 从第一个呼叫儿童造成 - 从第二forkJoin（儿童或儿童[] []数组）的结果。
  4. 之后，你需要加入data.page.results与儿童（即数组的数组）。希望帮助。
0
投票

新增返回数据阿米尔的答案摆脱错误的。 map函数需要返回一个可观察的类型wikiTree的。

ngOnInit() {
       this.wikiTree$ = this.wikiService.GetWikiHierarchy().pipe(
          switchMap(data => 
             forkJoin(data.page.results.map(result => this.wikiService.GetWikiHierarchy(result.id))).pipe(
                map(children => ({data, children}))
             )
          )
       ).subscribe((data, children) => {
            const newInfoCards = data.page.results.map((result, i) => (
            {
              "image": "",
              "title": result.title,
              "titleLink": "/page/wiki/"+ result.id,
              "children": children[i]
            }))
            this.infoCards = [...this.infoCards,...newInfoCards]
            return data
          },
          (err) => {
            console.log(err);
          }
       );
}
最新问题
© www.soinside.com 2019 - 2024. All rights reserved.