'array', ]; protected $fillable = [ 'plant_id', 'line_id', 'item_id', 'machine_id', 'production_order', 'serial_number', 'observed_value', 'characteristic_name', 'status', 'inspection_status', 'inspection_lot_number', 'remark', 'result', 'created_at', 'updated_at', 'created_by', 'updated_by', ]; public function plant(): BelongsTo { return $this->belongsTo(Plant::class); } public function line(): BelongsTo { return $this->belongsTo(Line::class); } public function item(): BelongsTo { return $this->belongsTo(Item::class); } public function machine(): BelongsTo { return $this->belongsTo(Machine::class); } }