CODEWITHSUNDEEP
httpflutterdart
BraveEvidence
BraveEvidence

Reputation: 57

How to pass List of Custom Objects using Dart's http?

I am trying to pass List of Custom Object to my API.

Following is my code 

import 'package:meta/meta.dart';
import 'package:json_annotation/json_annotation.dart';

part 'submit_survey_question_options_model.g.dart';

@JsonSerializable(nullable: false)
class SubmitSurveyQuestionOptionsModel {
  String questionId;
  String answer;

  SubmitSurveyQuestionOptionsModel(
      {@required this.questionId, @required this.answer});

  factory SubmitSurveyQuestionOptionsModel.fromJson(
          Map<String, dynamic> json) =>
      _$SubmitSurveyQuestionOptionsModelFromJson(json);

  Map<String, dynamic> toJson() =>
      _$SubmitSurveyQuestionOptionsModelToJson(this);
}



Future<SubmitSurveyModel> submitSurvey(
      String userId,
      String facultyId,
      String surveyId,
      List<SubmitSurveyQuestionOptionsModel> submitSurveyQuestionOptionList,
      String subjectId) async {
    Map<String, dynamic> body = {
      "userId": userId,
      "facultyId": facultyId,
      "surveyId": surveyId,
      "survey": submitSurveyQuestionOptionList,
      "subjectId": subjectId
    };

    final response = await http.post(
      SUBMIT_SURVEY_URL,
      body: json.encode(body),
    );

    SubmitSurveyModel submitSurveyModel = standardSerializers.deserializeWith(
        SubmitSurveyModel.serializer, json.decode(response.body));


    return submitSurveyModel;
  }

I am using json_serializable in my pubspec. I built the serializable class using flutter packages pub run build_runner build

I am not able to figure out what's the problem as the data is not submitted properly?

I have referred the following links but couldn't get it working

Flutter Error: type 'AddressInfo' is not a subtype of type 'String' in type cast

Dart Error Converting Object To JSON

Upvotes: 1

Views: 4444

Answers (2)

Sanjayrajsinh
Sanjayrajsinh

Reputation: 17249

  1. You need to add json.encode(body) in body

  2. Add these two header
    'Content-type': 'application/json',
    'Accept': 'application/json',

     http.post(url,<br>
    body: json.encode(body),
    headers: { 'Content-type': 'application/json',
      'Accept': 'application/json'},
    encoding: encoding)
    .then((http.Response response) {
// print(response.toString());
    }

Upvotes: 0

shb
shb

Reputation: 6277

Try passing the below headers

  Map<String, String> headers = {
      'Content-type': 'application/json',
      'Accept': 'application/json',
    };

  final response = await http.post(Uri.encodeFull(url), body: json.encode(body), headers: headers);

Upvotes: 2

Related Questions