'integer', ]; public function booking(): BelongsTo { return $this->belongsTo(Booking::class); } public function customer(): BelongsTo { return $this->belongsTo(User::class, 'customer_id'); } public function vehicle(): BelongsTo { return $this->belongsTo(Vehicle::class); } public function rentalCompany(): BelongsTo { return $this->belongsTo(RentalCompany::class); } }