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[英]How to combine two object lists into one list by id in rxjs using observables?
[英]How to combine two Observables into one Observable Array using RxJs
我試圖將兩個 Observables 組合成一個 Observables 數組,我的 Angular 應用程序可以隨着時間的推移訂閱和接收值。 該場景使用聊天機器人。 用戶提供輸入,機器人做出響應,兩者結合在一個數組中用於聊天流。
請參閱以下內容:
用於獲取用戶輸入的聊天輸入組件:
onNewComment(value: string): void {
this.chatService.addComment(value);
}
然后與chat.service.ts
import { Injectable, Output } from '@angular/core';
import { Observable, BehaviorSubject, Subject, combineLatest, from, merge, concat } from 'rxjs';
import { environment } from '../../environments/environment';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { UserInput } from '../interfaces/user-input';
import { map, tap, switchMap, mergeMap, toArray, scan, shareReplay, take } from 'rxjs/operators';
import { of } from 'rxjs';
import { text } from '@angular/core/src/render3';
import { Division } from '../interfaces/division';
const headers = new HttpHeaders();
headers.append(
'Content-Type', 'application/json'
);
@Injectable({
providedIn: 'root'
})
export class ChatService {
apiUrl = environment.apiUrl;
conversationSubject: BehaviorSubject<any[]> = new BehaviorSubject<any>([]);
conversationArray$: Observable<any> = this.conversationSubject.asObservable();
private commentAddedSubject = new Subject<any>();
commentAddedAction$ = this.commentAddedSubject.asObservable();
sessionToken$ = this.http.get<any>(`${this.apiUrl}/api/session`).pipe(
map(data => data.session_id),
tap(data => this.addComment('')),
shareReplay(1)
);
commentWithSessionToken$ = combineLatest([
this.sessionToken$,
this.commentAddedAction$
]).pipe(
map(([sessionToken, comment]) => {
return {
session_id: sessionToken,
input: {
text: comment
},
};
}
),
);
botResponse$ = this.commentWithSessionToken$
.pipe(
switchMap(comment =>
of(comment)
.pipe(
mergeMap(data => this.http.post<any>(`${this.apiUrl}/api/message`,
{
userInput: data
},
{
headers: headers
})
),
)
)
);
addComment(newComment?: string) {
this.commentAddedSubject.next(newComment);
}
constructor(
private http: HttpClient,
) { }
}
我嘗試了多種方法將commentWithSessionToken$
和botResponse$
成一組用戶輸入和機器人響應,但沒有任何運氣。 我需要的最終結果是這樣的:
[commentWithSessionToken$, botResponse$, commentWithSessionToken$, etc, etc]
任何建議將不勝感激。 謝謝你。
請使用 rxjs forkJoin
forkJoin(commentWithSessionToken$, botResponse$, commentWithSessionToken$, etc, etc)
返回類型是observable<[commentWithSessionToken$, botResponse$,...]>
我認為你應該合並你的觀察對象並掃描它們
chat$ = merge(this.commentWithSessionToken$, this.botResponse$).pipe(
scan((acc, curr) => ([...acc, curr]), []),
);
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