brewman/overlord/src/app/attendance/attendance.service.ts

import {Injectable} from '@angular/core';
import {Observable} from 'rxjs/internal/Observable';
import {catchError} from 'rxjs/operators';
import {HttpClient, HttpHeaders, HttpParams} from '@angular/common/http';
import {Attendance} from './attendance';
import {ErrorLoggerService} from '../core/error-logger.service';

const httpOptions = {
  headers: new HttpHeaders({'Content-Type': 'application/json'})
};

const url = '/api/attendance';
const serviceName = 'AttendanceService';

@Injectable({providedIn: 'root'})
export class AttendanceService {

  constructor(private http: HttpClient, private log: ErrorLoggerService) {
  }

  get(date: string): Observable<Attendance> {
    const getUrl: string = (date === null) ? url : `${url}/${date}`;
    return <Observable<Attendance>>this.http.get<Attendance>(getUrl)
      .pipe(
        catchError(this.log.handleError(serviceName, `get date=${date}`))
      );
  }

  save(attendance: Attendance): Observable<Attendance> {
    return <Observable<Attendance>>this.http.post<Attendance>(`${url}/${attendance.date}`, attendance, httpOptions)
      .pipe(
        catchError(this.log.handleError(serviceName, 'save'))
      );
  }
}