'Property 'concatMap' does not exist on type 'Observable

Please help, i am trying to send a put request from Angular...when i try to use concatMap i get the error

public updateUser(token: string, requestBody: any): Observable<User> {
        const myHeaders = new HttpHeaders({ 'Accept': 'application/json', 'Content-Type': 'application/json', 'Authorization': 'Bearer ' + token });
        return this.http.put<User>(this.baseUrl + "api/user", requestBody, { headers: myHeaders }).concatMap(data => {
            return of(data);
        });
      }

I get the below error..please anyone knows what i am doing wrong

Property 'concatMap' does not exist on type 'Observable<User>'.

I have tried the following, nothing worked, still same error

import 'rxjs/add/operator/concatMap';

import { concatMap } from 'rxjs/operators';
angularrxjsjavascriptsqldatabasemongodbdata-structures


Solution 1:[1]

I was able to solve this by adding pipe to my code

public updateUser(token: string, requestBody: any): Observable<User> {
    const myHeaders = new HttpHeaders({ 'Accept': 'application/json', 'Content-Type': 'application/json', 'Authorization': 'Bearer ' + token });
    return this.http.put<User>(this.baseUrl + "api/user", requestBody, { headers: myHeaders })
    .pipe( 
    concatMap(data => {
        return of(data);
    })
);

}

Solution 2:[2]

I would still prefer mongoDB and create a better schema structure. And use aggregate functions to retrieve data.

User schema -> DailyKeys schema

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 shine odigie
Solution 2 Sanmitra Nagaraj

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