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,
      );

CodePudding user response：

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>))

CodePudding user response：

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();