Question 76166 in Flutter Question posted in
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_TypeError (type '(dynamic) => Null' is not a subtype of type '(String, dynamic) => void' of 'action') – Flutter

i am doing GET api then specialized to model and i am getting this error, i am not sure what to do

json Link : https://api-zingmp3-vercel.vercel.app/api/home

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2

Answers


  1. 0

    You should cast the json item list before calling forEach():

    (json['items'] as List).forEach()
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  2. 0 
    if (json['items'] != null) {

  json['items'].forEach((e) {
    items.add(Item.fromJson(e));
});
...
}

    Try changing the code above to A, B and C.

    A

      if (json['items'] != null) {

     var itemBox = json[“items"] as List<Map<String, dynamic>>;
     itemBox.forEach((e) {
        items.add(Item.fromJson(e));
     });
     ...
  }

    B

      if (json['items'] != null) {

     var itemBox = json[“items"] as List<Map<String, dynamic>>;
     itemBox.map<Item>((e) => testList.add(Item.fromJson(e)) as Item);
     ...
  }

    C

     if (json['items'] != null) {

    items = List<Item>.from(
    (json['items'] as List<Map<String, dynamic>>).map((x) => Item.fromJson(x)));
    ...
  }
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