Trying to fetch json data in flutter

Question

I am trying to fetch json data from this url- "https://jsonplaceholder.typicode.com/photos". And I am following this flutter cookbook tutorial - "https://flutter.dev/docs/cookbook/networking/background-parsing"

My model class looks like this-

class ModelData {
          ModelData({
            this.albumId,
            this.id,
            this.title,
            this.url,
            this.thumbnailUrl,
  });

     final int albumId;
     final int id;
     final String title;
     final String url;
     final String thumbnailUrl;



factory ModelData.fromJson(Map<String, dynamic> json) => ModelData(
albumId: json["albumId"] as int,
id: json["id"] as int,
title: json["title"] as String,
url: json["url"] as String,
thumbnailUrl: json["thumbnailUrl"] as String,
 );
 }

And my parseData method looks like this-

List<ModelData> parseData(String responseBody) {
final parsed = jsonDecode(responseBody).cast<Map<String, dynamic>>();

return parsed
    .map<ModelData>((json) => ModelData().fromJson(json)).toList();

}

The problem is in the last line of this method. It says "error: The method 'fromJson' isn't defined for the type 'ModelData'. (undefined_method at [flutter_rest] lib\main.dart:61)". i don't see any typo problem here. What might going wrong here?

ModelData().fromJson(json) change it to ModelData.fromJson(json). Factory methods work like static functions — Afridi Kayal
– Afridi Kayal, Commented May 22, 2021 at 7:28

darshan · Accepted Answer · 2021-05-22 07:28:31Z

3

Factory methods act like a static method but you are initialising the class by using ModelData().
Try like this:

ModelData.fromJson(json)

answered May 22, 2021 at 7:28

darshan

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