Here are my models:

class BookReading extends Eloquent {

    // Book reading has many authors
    public function authors()
    {
        return $this->belongsToMany('Author');
    }
}

class Author extends Eloquent {

    public function book_readings()
    {
        return $this->hasMany('BookReading');
    }
}

This works:

$book_stores = [1,2,3,4];
$book_readings = BookReading::whereIn('location_id', $book_stores)
                    ->first()->authors()->get()->toJson();

This does not work
$book_readings = BookReading::whereIn('location_id', $book_stores)
                    ->get()->authors()->get()->toJson();

Is there a way to get all book readings and associated authors in one query?