Laravel - Undefined offset 0 - collection.php - php

Question

I'm programming a web app. The backend is a RESTFul app based in Laravel 4.
I'm having problems with a particular controller.
BedsController.php
class BedsController extends \BaseController {
/**
* Display a listing of the resource.
* GET /beds
*
* #return Response
*/
public function index()
{
//
$user = JWTAuth::parseToken()->authenticate();
$data = Input::get('room');
$retorno = array();
$hoy = date('Y-m-d');
if( $data ){
$d = intval( $data );
$beds = Bed::where('room', '=', $d )->get( array('size', 'room', 'id', 'name') );
foreach( $beds as $b ){
$b->stay = Stay::where('bed', '=', $b->id )
->where('indate', '<=', $hoy )
->where('outdate', '>=', $hoy )
->get( array( 'id', 'room', 'bed', 'guest', 'booking', 'indate', 'outdate' ) );
dd( $b->stay );
if( isset( $b->stay->guest ) ){
$b->stay->huesped = Guest::find( $b->stay->guest );
}else{}
if( isset( $b->stay->booking ) ){
$b->stay->huesped = Booking::find( $b->stay->booking );
}
//dd( $b->stay );
array_push( $retorno, $b );
}
//$room = Room::find( $d );
//return $room->camas()->get( 'size', 'room', 'id');
//$beds = Bed::where('room', $data )->get();
}else{
$beds = Bed::where('hotel', '=', $user->hostel )->get( array('size', 'room', 'id', 'name') );
foreach( $beds as $b ){
$be = $b['attributes'];
$st = array();
$stay = Stay::where('bed', '=', $b->id )
->where('indate', '<=', $hoy )
->where('outdate', '>=', $hoy )
->get( array( 'id', 'room', 'bed', 'guest', 'booking', 'indate', 'outdate' ) );
//return $stay[0];
$st = $stay[0];
//dd( $stay[0] );
if( isset( $stay[0] ) ){
if( $stay[0]['attributes']['guest'] > 0 ){
$be['huesped'] = Guest::find( $b->stay->guest );
}else{}
if( $stay[0]['attributes']['booking'] ){
$be['reserva'] = Booking::find( $b->stay->booking );
}
$be['stay'] = $st;
}
array_push( $retorno, $be);
$be = array();
}
}
return $retorno;
}
So, when I make a call to mysiteapp.local/beds, I should get back a composite array with the bed's data and, if there's a reservation, or if that bed's occupied at the moment, the stay info and guest's info.
But all I get is a compiling error message sayin':
error:{type: "ErrorException", message: "Undefined offset: 0",…}
file:"/home/pablo/htdocs/pbertran/angularh/api/vendor/laravel/framework/src/Illuminate/Support/Collection.php"
line:788
message:"Undefined offset: 0"
type:"ErrorException"
Have been googling around, but couldn't find any solution.
Any ideas?
Thanks in advance!

Answer 1

You make assumptions about that index being present, which may not always be the case. Your logic should be more thussly:
$st = isset($stay[0]) ? $stay[0] : false;
if ($st){
//now you can use it safely.
}

Answer 2

To add another outcome, I was doing a "double" GroupBy on the collection:
$price_change->grouped_lines = $price_change->lines->groupBy('PriceListID')->transform(function($item, $k) {
return $item->groupBy('StockID');
});
The above basically groups the collection by 2 keys so:
$price_change->grouped_lines[PriceListID][StockID]->
I received the "Undefined offset 0 - collection.php" error
To fix it I had to first do a isset() on the first key then the second:
if(isset($price_change->grouped_lines[1]) && isset($price_change->grouped_lines[1][23]))