FullCalendar not fetching Events from Feed of DB Query (Laravel) - json

Question

My event feed does only work when I hardcode the events in my EventController. Once I get them from database query the events are not displayed though the first event is the exact same I used in the hardcoded event.
Works (Calendar shows event):
public function eventFeed(Request $request)
{
$events = array(
[
"id" => 1,
"resourceId" => '1115',
"title" => 'Wartung Steuerung',
"start" => '2020-06-11 00:20:23',
"end" => '2020-06-28 21:21:30',
]
);
return json_encode($events);
}
From the calendar view I have a control Ajax call that fetches the same feed as FullCalendar. The received feed is
[{"id":1,"resourceId":"1115","title":"Wartung Steuerung","start":"2020-06-11 00:20:23","end":"2020-06-28 21:21:30"}]
Does not work (Calendar stays empty):
public function eventFeed(Request $request)
{
$start = Carbon::create($request->input('start'));
$end = Carbon::create($request->input('end'));
$events = DB::table('toolplanview')->select('id','resourceId','title','start','end')
->whereDate('start', '>=', $start)->whereDate('end', '<=', $end)->get();
return json_encode($events);
}
The feed from the DB query is:
[{"id":1,"resourceId":"1115","title":"Wartung Steuerung","start":"2020-06-11 00:20:23","end":"2020-06-28 21:21:30"},{"id":2,"resourceId":"1157","title":"Werkstatt","start":"2020-06-12 09:09:41","end":"2020-06-24 03:45:59"},{"id":3,"resourceId":"1136","title":"Neue Toranlage","start":"2020-06-10 20:29:44","end":"2020-06-23 04:26:38"},{"id":4,"resourceId":"1138","title":"Neue Toranlage","start":"2020-06-10 03:23:12","end":"2020-06-28 11:20:36"}]
I dont see why this feed would not work. My calendar:
document.addEventListener('DOMContentLoaded', function() {
var calendarEl = document.getElementById('calendar');
var calendar = new FullCalendar.Calendar(calendarEl, {
schedulerLicenseKey: 'GPL-My-Project-Is-Open-Source',
locale: 'de',
plugins: [ 'interaction', 'resourceTimeline' ],
defaultView: 'resourceTimelineWeek',
editable: true,
titleFormat: { year: 'numeric', month: '2-digit', day: '2-digit' },
header: {
right: 'today prev,next'
},
slotLabelFormat: [
{ month: 'long', year: 'numeric' }, // top level of text
{ weekday: 'short', day: '2-digit' } // lower level of text
],
resources: 'http://localhost/matpro/public/resource-feed',
events: 'http://localhost/matpro/public/event-feed',
});
calendar.render();
});

Answer 1

I found the reason for this behaviour, the issue is the where clause of my DB query:
$events = DB::table('events')->select('id','resourceId','title','start','end')->get();
->whereDate('start', '>=', $start)->whereDate('end', '<=', $end)->get();
When calender e.g. displays a week from 01.06. to 08.06 and one of my (generally longer) events starts on 30.05. and ends on 05.06. this event won't be displayed due to the where clauses in my query. The example dates I picked for testing accidentally overlapped with the calender start or end and therefore did not show up.