public function scopeVacant($query)
 {
     $ids = \App\Visit::lists('bed_id');
     //dd($ids);
     $beds = $query->select(\DB::raw("CONCAT(bed_type,'bed type : ',floor,'th floor ',section,' section ',rate_per_night, 'per night' ) AS full_name, id"))->whereNotIn('id', $ids)->lists('full_name', 'id');
     return $beds;
 }