'decimal:3', 'unit_cost' => 'integer', 'total_cost' => 'integer', ]; protected static function booted(): void { } public function business() { return $this->belongsTo(Business::class); } public function workOrder() { return $this->belongsTo(WorkOrder::class, 'work_order_id'); } public function sparePart() { return $this->belongsTo(SparePart::class, 'spare_part_id'); } }