The parameter 'id' can't have a value of 'null' because of its type

Question

I am making a catalog app, I have to named the items but it's not working.

class item {
  final String id;
  final String name;
  final String desc;
  final num price;
  final String color;
  final String image;

  item({this.id, this.name, this.desc, this.price, this.color, this.image});
}

The Error: {String id} Type: String

The parameter 'id' can't have a value of 'null' because of its type, but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier.

Full Code

Answer 1

Since you're using named arguments, the values can be null. You have to add the required keyword:

class item {
  final String id;
  final String name;
  final String desc;
  final num price;
  final String color;
  final String image;

  item({required this.id, required this.name, required this.desc, required this.price, required this.color, required required this.image});
}

Or, make the values nullable using ?:

class item {
  final String? id;
  final String? name;
  final String? desc;
  final num? price;
  final String? color;
  final String? image;

  item({this.id, this.name, this.desc, this.price, this.color, this.image});
}