Dart Null safety conversion is wrong

[郭翰林]

The right one should be like this：

class RecommendResult {
  RecommendResult({
      this.pageSize, 
      this.pageNo, 
      this.totalCount, 
      this.resultData, 
      this.searchAfter,});

  RecommendResult.fromJson(dynamic json) {
    pageSize = json['pageSize'];
    pageNo = json['pageNo'];
    totalCount = json['totalCount'];
    if (json['resultData'] != null) {
      resultData = [];
      json['resultData'].forEach((v) {
        resultData?.add(RecommendProduct.fromJson(v));
      });
    }
    searchAfter = json['searchAfter'];
  }
  int? pageSize;
  int? pageNo;
  int? totalCount;
  List<RecommendProduct>? resultData;
  String? searchAfter;

  Map<String, dynamic> toJson() {
    final map = <String, dynamic>{};
    map['pageSize'] = pageSize;
    map['pageNo'] = pageNo;
    map['totalCount'] = totalCount;
    if (resultData != null) {
      map['resultData'] = resultData?.map((v) => v.toJson()).toList();
    }
    map['searchAfter'] = searchAfter;
    return map;
  }

}

class RecommendProduct {
  RecommendProduct({
      this.brandName, 
      this.kzSkuCode, 
      this.isMarketItem, 
      this.searchAfter, 
      this.originalPrice, 
      this.isHaveStock, 
      this.oeCode, 
      this.supplierCode, 
      this.categoryName, 
      this.score, 
      this.itemId, 
      this.categoryId, 
      this.recommendReason, 
      this.itemName, 
      this.newPrice, 
      this.itemImage, 
      this.price, 
      this.tagInfos, 
      this.brandId,});

  RecommendProduct.fromJson(dynamic json) {
    brandName = json['brandName'];
    kzSkuCode = json['kzSkuCode'];
    isMarketItem = json['isMarketItem'];
    searchAfter = json['searchAfter'];
    originalPrice = json['originalPrice'];
    isHaveStock = json['isHaveStock'];
    oeCode = json['oeCode'];
    supplierCode = json['supplierCode'];
    categoryName = json['categoryName'];
    score = json['score'];
    itemId = json['itemId'];
    categoryId = json['categoryId'];
    recommendReason = json['recommendReason'];
    itemName = json['itemName'];
    newPrice = json['newPrice'];
    itemImage = json['itemImage'];
    price = json['price'];
    if (json['tagInfos'] != null) {
      tagInfos = [];
      json['tagInfos'].forEach((v) {
        tagInfos?.add(TagInfo.fromJson(v));
      });
    }
    brandId = json['brandId'];
  }
  String? brandName;
  String? kzSkuCode;
  bool? isMarketItem;
  String? searchAfter;
  String? originalPrice;
  bool? isHaveStock;
  String? oeCode;
  String? supplierCode;
  String? categoryName;
  double? score;
  int? itemId;
  int? categoryId;
  String? recommendReason;
  String? itemName;
  String? newPrice;
  String? itemImage;
  String? price;
  List<TagInfo>? tagInfos;
  int? brandId;

  Map<String, dynamic> toJson() {
    final map = <String, dynamic>{};
    map['brandName'] = brandName;
    map['kzSkuCode'] = kzSkuCode;
    map['isMarketItem'] = isMarketItem;
    map['searchAfter'] = searchAfter;
    map['originalPrice'] = originalPrice;
    map['isHaveStock'] = isHaveStock;
    map['oeCode'] = oeCode;
    map['supplierCode'] = supplierCode;
    map['categoryName'] = categoryName;
    map['score'] = score;
    map['itemId'] = itemId;
    map['categoryId'] = categoryId;
    map['recommendReason'] = recommendReason;
    map['itemName'] = itemName;
    map['newPrice'] = newPrice;
    map['itemImage'] = itemImage;
    map['price'] = price;
    if (tagInfos != null) {
      map['tagInfos'] = tagInfos?.map((v) => v.toJson()).toList();
    }
    map['brandId'] = brandId;
    return map;
  }

}

class TagInfo {
  TagInfo({
      this.fontColor, 
      this.tagSubtitle, 
      this.shadingColor, 
      this.tagTitle,});

  TagInfo.fromJson(dynamic json) {
    fontColor = json['fontColor'];
    tagSubtitle = json['tagSubtitle'];
    shadingColor = json['shadingColor'];
    tagTitle = json['tagTitle'];
  }
  String? fontColor;
  String? tagSubtitle;
  String? shadingColor;
  String? tagTitle;

  Map<String, dynamic> toJson() {
    final map = <String, dynamic>{};
    map['fontColor'] = fontColor;
    map['tagSubtitle'] = tagSubtitle;
    map['shadingColor'] = shadingColor;
    map['tagTitle'] = tagTitle;
    return map;
  }

}

[郭翰林]

我提交了一个PR，麻烦过一下，Dart空安全的我适配完了：#1904

[Nato Boram]

Duplicate of #1673