Dart model throws error when mixing many data types

Question

I made this simple model to work with an API

class BooksModel {
  List<_Book> _books = [];
  BooksModel.fromJson(Map<dynamic, dynamic> parsedJson) {
    List<_Book> temp = [];
    for (int i = 0; i < parsedJson['books'].length; i++) {
      _Book book = _Book(parsedJson['books'][i]);
      temp.add(book);
    }
    _books = temp;
  }
  List<_Book> get books => _books;
}

class _Book {
    int _id;
    String _name;
  _Book(book) {
      _id = book['id'];
      _name = book['name'];
  }
  int get id => _id;
  int get name => _name;
}

The problem is i have to turn all '_Book' class properties to 'String', if i made only one 'int' as given in the above example, it throws this error.

type 'String' is not a subtype of type 'int'

I don't even use that 'id' which is 'int' in my app, so it's not about the usage of it, the problem is in this model

score 1 · Accepted Answer · answered Feb 23 '20 at 16:42

1

Can you just show the example of your json, so that i can tell you that what your model should be or where it is going wrong. So maybe your issue is not that big , id required is integer and you are passing the String.

answered Feb 23 '20 at 16:42

Sagar Acharya

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score 1 · Answer 2 · answered Feb 23 '20 at 17:00

1

Is book['id'] a string? Try it:

// _id = book['id'];
   _id = int.parse(book['id']);

answered Feb 23 '20 at 17:00

Kahou

3,200
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Dart model throws error when mixing many data types

2 Answers2