The Angular Nativescript framework is lacking necessary properties for the 'Observable<>' type

Whenever I try to set my function as

getCalendarEvents(): Observable<Array<CalendarEvent>>{
, I encounter an error message stating
Type 'Observable<CalendarEvent[]>' is missing the following properties from type 'CalendarEvent[]': length, pop, push, concat, and 24 more.

This pertains to the service.ts file

getCalendarEvents(): Observable<Array<CalendarEvent>>{
         var listCal:any = []
         return this.getCalendarData().pipe(map((data: any) => {
          listCal = data;
        console.log('list cal', listCal)
             let startDate: Date,
             endDate: Date,
             event: CalendarEvent;
             let colors: Array<Color> = [new Color(200, 188, 26, 214), new Color(220, 255, 109, 130), new Color(255, 55, 45, 255), new Color(199, 17, 227, 10), new Color(255, 255, 54, 3)];
             let events: Array<CalendarEvent> = new Array<CalendarEvent>();
             for (let i = 1; i < listCal.length; i++) {
                  event = new CalendarEvent(listCal[i].title, new Date(listCal[i].date), new Date(listCal[i].date), false, colors[i * 10 % (listCal[i].colour.length - 1)]);    

                  events.push(event);     
              }
             return events;
            }));          
    }

Although the service.ts file does not display any errors, the issue arises in the calendar component due to the following declaration:

import { Component, OnInit } from '@angular/core';

import { calendarApiService } from './service/api.service';
import { CalendarClass } from './classes/calendarClass';
import { RadCalendar, CalendarEvent, CalendarSelectionEventData } from "nativescript-ui-calendar";

@Component({
  selector: 'ns-calendar',
  templateUrl: './calendar.component.html',
  styleUrls: ['./calendar.component.css'],
  moduleId: module.id,
  providers: [calendarApiService]
})
export class CalendarComponent implements OnInit {

  constructor(private _calendarApiService: calendarApiService) {
    //console.log("hi");

   }
   private _events: Array<CalendarEvent>;
   private _listItems: Array<CalendarEvent>;

   listOfCalendar: CalendarClass[];




get eventSource() {
    return this._events;
}

get myItems(): Array<CalendarEvent> {
    return this._listItems;
}

set myItems(value) {
    this._listItems = value;
}

// ngOnInit() {
//     this._events = this._calendarService.getCalendarEvents();
// }


ngOnInit() {

  this._events = this._calendarApiService.getCalendarEvents();


  this._calendarApiService.getCalendarData() 
  .subscribe( 
  (data:any)=>{ 
  this.listOfCalendar = data; 
  } 
  );

  //console.log(this.listOfCalendar);

}

onDateSelected(args: CalendarSelectionEventData) {
    const calendar: RadCalendar = args.object;
    const date: Date = args.date;
    const events: Array<CalendarEvent> = calendar.getEventsForDate(date);


    this.myItems = events;
}


}

Answer №1

It is important to ensure that your method returns Array<CalendarEvent> or does not specify any type, as you are attempting to assign an Array to

Observable<Array<CalendarEvent>
.

getCalendarEvents(){
         var listCal:any = []
         this.getCalendarData().pipe(map((data: any) => {
          listCal = data;
        console.log('list cal', listCal)
             let startDate: Date,
             endDate: Date,
             event: CalendarEvent;
             let colors: Array<Color> = [new Color(200, 188, 26, 214), new Color(220, 255, 109, 130), new Color(255, 55, 45, 255), new Color(199, 17, 227, 10), new Color(255, 255, 54, 3)];
             let events: Array<CalendarEvent> = new Array<CalendarEvent>();
             for (let i = 1; i < listCal.length; i++) {
                  event = new CalendarEvent(listCal[i].title, new Date(listCal[i].date), new Date(listCal[i].date), false, colors[i * 10 % (listCal[i].colour.length - 1)]);    

                  events.push(event);     
              }
             return events;
            }));          
    }

Answer №2

Implement the from operator in order to transform an array into an observable

return from(events);

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