Question 78958 in Flutter Question posted in
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type '(dynamic) => ProductModel' is not a subtype of type '(String, dynamic) => MapEntry<dynamic, dynamic>' of 'transform' – Flutter

Tried almost every solution. No luck 🙁

Future<List<ProductModel>> getProducts() async {
    try {
      final response = await apiService.sendRequest.get('/product');
      if (response.data != null) {
        print("Data == $response");
       
        return response.data
            .map((e) => ProductModel.fromJson(e.toMap()))          // error is thrown here
            .toList();     
      }
      return <ProductModel>[];
    } catch (ex) {
      // return <ProductModel>[];
      rethrow;
    }
  }

response is:

  {
  "status": "SUCCESS",
  "message": "Records found",
  "data": [
    {
      "_id": "634acde1a556b0cd25dfffb1",
      "typeOfProduct": "Cake",
      "name": "Designer Cake",
      "primaryPrice": 700,
      "primaryDiscountedPrice": 560,
      "secondaryPrice": 1400,
      "secondaryDiscountedPrice": 1120,
      "categories": [
      ....
      ],
      "tags": [
       ...
      ],
      "description": "This is the best cake ",
      "images": [
       ...
      ],
      "quantity": "1 Box",
      "__v": 0,
      "primaryDiscountedRate": 20,
      "secondaryDiscountedRate": 20
    },
 ]
}

Product Model is :

class ProductModel {
  ProductModel({
    required this.id,
    required this.typeOfProduct,
    required this.name,
    required this.primaryPrice,
    this.primaryDiscountedPrice,
    this.secondaryPrice,
    this.secondaryDiscountedPrice,
    required this.categories,
    required this.tags,
    this.description,
    required this.images,
    this.quantity,
    this.primaryDiscountedRate,
    this.secondaryDiscountedRate,
  });

  ObjectId id;
  String typeOfProduct;
  String name;
  int primaryPrice;
  int? primaryDiscountedPrice;
  int? secondaryPrice;
  int? secondaryDiscountedPrice;
  List<String> categories;
  List<String> tags;
  String? description;
  List<Image> images;
  String? quantity;
  int? primaryDiscountedRate;
  int? secondaryDiscountedRate;

  factory ProductModel.fromJson(Map<String, dynamic> json) => ProductModel(
        id: json["_id"],
        typeOfProduct: json["typeOfProduct"],
        name: json["name"],
        primaryPrice: (json["primaryPrice"]),
        primaryDiscountedPrice: (json["primaryDiscountedPrice"]),
        secondaryPrice: (json["secondaryPrice"]),
        secondaryDiscountedPrice: (json["secondaryDiscountedPrice"]),
        categories: List<String>.from(json["categories"].map((x) => x)),
        tags: List<String>.from(json["tags"].map((x) => x)),
        description: json["description"],
        images: List<Image>.from(json["images"].map((x) => Image.fromJson(x))),
        quantity: json["quantity"],
        primaryDiscountedRate: (json["primaryDiscountedRate"]) != null
            ? json['primaryDiscountedRate'].toInt()
            : null,
        secondaryDiscountedRate: (json["secondaryDiscountedRate"]) != null
            ? json["secondaryDiscountedRate"].toInt()
            : null,
      );
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    The mistake was response.data had the following structure

    {
  "message" : ..
  "status" : ..
  "data" : [{},{}..]
}

    Accesing response.data wouldn't take me directly to data , so i had to access using response.data['data'] this solved my problem

    Final code:

    return response.data['data']
            .map((e) => ProductModel.fromJson(e))
            .toList();

  2. 0

    you’re trying to call toMap() on a Map type, which usually will throw an error because the Map doesn’t have this method.

    The error is not thrown for you until you run your code because your data is coming from your external resource.

    If you try separately this:

       Map a= {
     "key": "value",
   };  
   print(a.toMap()); // throw an error

    In your case, you should simply cast the elements in your response.data to an actual Map, like this:

    //...
.map((e) => ProductModel.fromJson(e as Map<String, dynamic>))
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