problems with getMessageHistoryByPage()

[TeDyGuN]

hello, I have a question more of programming than ngChat, I'm stuck 3 days with this, that's why I see the need to open this issue. how can I get the messages from the database without an observable?, since I cant get the messages outside de http.get because it is a synchronous function.

public getMessageHistoryByPage(userId: any, size: number, page: number): Observable<Message[]> {
        let mockedHistory: Array<Message>;
        let url = 'http://localhost:3000/historial/' + userId + '/' + this.user.id;
        this.http.get(url)
            .pipe(map((result) => {
                    mockedHistory = result['messages'];
                    let startPosition: number = (page - 1) * size;
                    let endPosition: number = page * size;
                    mockedHistory = mockedHistory.slice(startPosition, endPosition);
                },
            )).subscribe();
        // In this line mockedHistory is empty and i can't return mockedHistory inside de get request.
        return of(mockedHistory.reverse()).pipe(delay(1000));
    }

Thanks for answer and sorry for the noob question.

[rpaschoal]

Hi @TeDyGuN ,

The adapter requires an Observable return. If your method to retrieve your data is synchronous you could just wrap your result with an Observable.of(yourDataHere) call.

Hope it helps! Cheers.

[TeDyGuN]

I solved with this code, thanks a lot!!

public getMessageHistoryByPage(userId: any, size: number, page: number): Observable<Message[]> {
        let url = 'http://localhost:3000/historial/' + userId + '/' + this.user.id + '/' + size + '/' + page;
        return this.http.get<Message[]>(url);
    }