How to retrieve the array data in my flutter app

Question

Hi I've successfully parse my json data but when i try to print it into my screen got intanse of 'Account' I have a little knowledge of flutter but i'm struggling to successfully make it works

Json response after successfully created one new account

    {
  result: { ok: 1, n: 1, opTime: { ts: [Timestamp], t: 2 } },
  ops: [
    {
      seed: 'style nothing better nest nation future lobster garden royal lawsuit mule drama',
      account: [Array],
      _id: 604604c38fbb1e00fea541ce
    }
  ],
  insertedCount: 1,
  insertedIds: { '0': 604604c38fbb1e00fea541ce }
}

model:

import 'dart:convert';

Wallet walletFromJson(String str) => Wallet.fromJson(json.decode(str));

String walletToJson(Wallet data) => json.encode(data.toJson());

class Wallet {
    Wallet({
        this.seed,
        this.account,
    });

    String seed;
    List<Account> account;

    factory Wallet.fromJson(Map<String, dynamic> json) => Wallet(
        seed: json["seed"],
        account: List<Account>.from(json["account"].map((x) => Account.fromJson(x))),
    );

    Map<String, dynamic> toJson() => {
        "seed": seed,
        "account": List<dynamic>.from(account.map((x) => x.toJson())),
    };
}

class Account {
    Account({
        this.privateKey,
        this.address,
    });

    String privateKey;
    String address;

    factory Account.fromJson(Map<String, dynamic> json) => Account(
        privateKey: json["privateKey"],
        address: json["address"],
    );

    Map<String, dynamic> toJson() => {
        "privateKey": privateKey,
        "address": address,
    };
}

and the part to create new wallet. I can actually retrieve the seed phrase but the account list is not shown

Future<Wallet> createWallet(String number) async {
  final String apiUrl = "http://localhost:3000/createNewone";
  
  final response = await http.post(apiUrl, body: {"number": number});
  


  if (response.statusCode == 200 || response.statusCode == 201) {
    
    final String responseString = response.body;
    
    
    return walletFromJson(responseString);
  } else {
    return null;
  }
}

you need to use final res = response.body['ops'] and use jsonDecode after that and pass it to walletFromJson — Hadi Norouzi
– Hadi Norouzi, Commented Mar 8, 2021 at 13:03

Stoyan Milev · Accepted Answer · 2021-03-08 13:51:29Z

1

In order to have a more meaningful message on the screen, you have to override toString() method in your model. For example in your Account class add:

@override
String toString() {
    return 'Account{privateKey: $privateKey, address: $address}';
}

answered Mar 8, 2021 at 13:51

Stoyan Milev

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2 Comments

Stoyan Milev Over a year ago

Can you add the code how you print your object to the question and where exactly you are facing the issue. More context will be helpful!

Josue Guessennd Over a year ago

he said i need to override the tostring() that allow to convert json into string and update the class model. after i need the output will automatically retrieve this two values

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