How do I update an existing entry in my database? - laravel

Question

How can I update my database properly? I'd like to modify an entry for which I have the id for, but a 'net::ERR_EMPTY_RESPONSE' is returned. Below I have my Controller:
public function update(Request $request, $id)
{
$booking = Booking::query($id);
$booking->start_date = $request->start;
$booking->end_date = $request->end;
$booking->save();
return response()->json($booking);
}
These are all defined in my home blade view:
const eventData = {
id: eventid,
start: arg.event.start.toISOString(),
end: arg.event.end.toISOString(),
};
How do I properly update start_date and end_date in my database?
Additionally, this is my Javascript used to fetch:
const eventid = arg.event.id;
const eventData = {
start: arg.event.start.toISOString(),
end: arg.event.end.toISOString(),
};
const csrfToken = document.head.querySelector("[name~=csrf-token][content]").content;
console.log(csrfToken);
fetch(`/api/event/update/${eventid}`, {
method: 'PUT',
headers: {
"X-CSRF-Token": csrfToken
},
body: encodeFormData(eventData),
})
.then(response => console.log(response))
.catch(error => console.log(error));
console.log("Complete");

Answer 1

I'm not sure how you're passing the ID for the booking, but from what I can see on the above, the ID is being passed in the request. Try this:
public function update(Request $request)
{
$booking = Booking::findOrFail($request->id);
$booking->start_date = $request->start;
$booking->end_date = $request->end;
$booking->save();
return response()->json($booking);
}

Answer 2

Updating a record is straight forward all you've got to is
public function update(Request $request)
{
// find the record by it's ID and also update it on the fly if you don't need to process anything else
$updatedData = Booking::findOrFail($request->id)->update(['start_date' => $request->start, 'end_date' => $request->end]);
return response()->json($updatedData);
}