Eager Loading Relationships with Yajra Laravel Error

Everyone hello, first thing I want to do is to show the data from the hotels table attached to the rooms table to the single listing page.

I am getting this error

Exception Message:Call to undefined method App\Hotel::map()

RoomController.php

public function apiRoom() {
    $hotels = Room::with('hotel');
    return Datatables::eloquent($hotels)
        ->addColumn('hotel', function (Room $htl) {
            return $htl->hotel->map(function ($hotellist) {
                    return str_limit($hotellist->hotel_name);
                });
        });

    $rooms = Room::all();
    return Datatables::of($rooms)
        ->addColumn('action', function ($rooms) {
            return '<a onclick="editForm('.$rooms->id.')" data-toggle="tooltip" data-original-title="Edit"> <i class="fa fa-pencil text-inverse m-r-10"></i> </a>'.
            '<a onclick="deleteData('.$rooms->id.')" data-toggle="tooltip" data-original-title="Close"> <i class="fa fa-close text-danger"></i> </a>';

        })->make(true);

room-list.blade.php

var table = $('#room-table').DataTable({
                      processing: true,
                      serverSide: true,
                      ajax: "",
                      columns: [
                        {data: 'id', name: 'id'},
                        {data: 'hotel', name: 'hotel.hotel_name'},
                        {data: 'room_name', name: 'room_name'},
                        {data: 'bonus_sum', name: 'bonus_sum'},
                        {data: 'action', name: 'action', orderable: false, searchable: false}
                      ]
                    });

Model File Room.php

class Room extends Model {
    protected $primaryKey = 'id';
    protected $fillable   = ['hotel_id', 'room_name', 'bonus_sum'];
    public function Hotel() {
        return $this->belongsTo('App\Hotel', 'hotel_id');
    }
}

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