toJson method
Implementation
Map<String, dynamic> toJson() => {
      if (imgSize != null) 'imgSize': imgSize,
      if (imgUrl != null) 'imgUrl': imgUrl,
      if (imgDrawName != null) 'imgDrawName': imgDrawName,
      if (imgDrawUrl != null) 'imgDrawUrl': imgDrawUrl,
      if (extraInfor != null) 'extraInfor': extraInfor,
      if (carDamages != null) 'damages': carDamages,
      if (carParts != null) 'carParts': carParts,
    };