article.dart

class Article {
  Source source;
  String author;

  Article.fromJson(Map<String, dynamic> articleJson)
      : source = Source.fromJson(articleJson['source']),
        author = articleJson['author']
}

class Source {
  String id;
  String name;

  Source.fromJson(Map<String, dynamic> sourceJson)
      : id = sourceJson['id'],
        name = sourceJson['name'];
}