Question 190563 in Flutter Question posted in
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Flutter – The argument type 'Object?' can't be assigned to the parameter type

List<PopularBookModel> populars = popularBookData
    .map((item) => PopularBookModel(item['title'], item['author'],
        item['price'], item['image'], item['color'], item['description']))
    .toList();

Result:

The argument type 'Object?' can't be assigned to the parameter type.

What should I do?

Tags:

2

Answers


  1. 0

    It look like item is of type Map<String, Object>, but the constructor of PopularBookModel takes specific types, most likely String. Try and see if this works:

    List<PopularBookModel> populars = popularBookData
    .map((item) => PopularBookModel(
        item['title'] as String,
        item['author'] as String,
        item['price'] as String,
        item['image'] as String,
        item['color'] as String,
        item['description'] as String))
    .toList();

    Or whatever type you expect to be there.

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  2. 0

    Please try the below code

    class PopularBookModel {
  final String id;
  final String title;
  final String author;
  final String price;
  final String image;
  final String color;
  final String description;

  const PopularBookModel(
    this.id,
    this.title,
    this.author,
    this.price,
    this.image,
    this.color,
    this.description
  );
}

    After creating model, Now create a variable to use

    late dynamic popularBookData;
late List<PopularBookModel> populars;

@override
void initState(){
  // Create your own function to fetch data from your server and define it to popularBookData
  populars = popularBookData.map((item) {
    return PopularBookModel(
      item['id'].toString(),
      item['title'].toString(),
      item['author'].toString(),
      item['price'].toString(),
      item['image'].toString(),
      item['color'].toString(), 
      item['description'].toString(),
    );
  }).toList();
}
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