Storing API data into SQLite - sql

Question

I want to fetch data from a REST API and store the information in my local database but get errors like :
_TypeError (type '(Map<String, dynamic>) => QuizDescription' is not a subtype of type '(dynamic) => QuizDescription' of 'f')
My List model:
factory QuizDescription.fromJson(Map<String, dynamic> json) =>
QuizDescription(
quizID: json['id'],
quizname: json['quizname'],
kurzbeschreibung: json['kurzbeschreibung'],
beschreibung: json['beschreibung'],
preis: json['preis'],
quizbild: json['quizbild']['url'],
rating: json['_rating_of_quiz']['rating_rating'],
);
Map<String, dynamic> toJson() => {
"quizID": quizID,
"quizname": quizname,
"kurzbeschreibung": kurzbeschreibung,
"beschreibung": beschreibung,
"preis": preis,
"quizbild": quizbild,
"rating": rating,
};
Database-Create method where I want to store information in :
static Future<int> createQuiz(QuizDescription quiz) async {
Database db = await DBQUIZProvider.initQuizDB();
return await db.insert('quiz', quiz.toJson());
}
API Call - which is using the Database method:
var url = Uri.parse('${Constants.BASE_URL}/QUIZ/getall');
var headers = {'Content-Type': 'application/json'};
var res = await http.get(
url,
headers: headers,
);
final body = json.decode(res.body);
QuizDescription quizliste =
body.map<QuizDescription>(QuizDescription.fromJson).toList();
DBQUIZProvider.createQuiz(quizliste);

Answer 1

try this...
var url = Uri.parse('${Constants.BASE_URL}/QUIZ/getall');
var headers = {'Content-Type': 'application/json'};
var res = await http.get(url, headers: headers,);
List tempList = json.decode(res.body);
Database-Create method where store information in
static Future<int> createQuiz(List quiz) async {
int result = 0;
Database db = await DBQUIZProvider.initQuizDB();
for (var element in planets) {
QuizDescription quizD = QuizDescription. fromJson(element);
result = await db.insert(
'quiz',
quizD.toMap(),
conflictAlgorithm: ConflictAlgorithm.replace,
);
}
return result;
}

Answer 2

try this:
static Future<int> createQuiz(Map<String, dynamic> row) async {
Database db = await DBQUIZProvider.initQuizDB();
return await db.insert('quiz', row);
}