'int', 'destination_city_id' => 'int', 'file_id' => 'int' ]; protected $fillable = [ 'title', 'summary', 'description', 'origin_city_id', 'destination_city_id', 'file_id', 'tour_type' ]; public function flight() { return $this->belongsTo(Flight::class, 'file_id'); } public function city() { return $this->belongsTo(City::class, 'destination_city_id'); } public function tourDepartures() { return $this->hasMany(TourDeparture::class); } }