Breaking Change From 5.1 -> 5.2

Hello,

I've scoured both the Laravel upgrade docs and dingo docs for a solution here but I can't seem to find one. On laravel 5.1.\* this block of code returns an array of JSON objects:

``` php
public function index($account)
{
if(Auth::user()->accounts->contains($account))
{
$drones = $account->drones()->where('retired',false)->get()->sortBy('total_flight_time');
$drones = $drones->reverse();
return $drones;
}
}
```

Returns:

```
{
"drones": [
{
"id": 21,
.....
},
{
"id": 26,
......
}
]
}
```

However, when I upgrade to Laravel 5.2 I get the following unexpected result:

```
{
"drones": {
"0": {
"id": 21,
....
},
"2": {
"id": 26,
.....
}
}
}
```

Can you point me to anywhere that might explain what's breaking this and how I can keep my API consistent while moving to 5.2? I can't afford breaking changes at the moment.

Thanks

Josh