How to convert the below response to String?-CodePudding

Here is my List of maps. But I want to convert these to string.

[{tid: 20210813, title: hello3, description: hello good evening every one, _id: 62ecc3f047ff077fe8d4549e}, {tid: 20210812, title: hello, description: hello good evening every one, _id: 62ecc3f047ff077fe8d4549d}, {tid: 20210814, title: hello4, description: hello good evening every one, _id: 62ecc3f047ff077fe8d4549f}, {tid: 20210812, title: hello, description: hello good evening every one, _id: 62ecc3f047ff077fe8d454a0}, {tid: 20210812, title: hello, description: hello good evening every one, _id: 62ece09647ff077fe8d454e6}, {tid: 20210812, title: hello, description: hello good evening every one, _id: 62ece09647ff077fe8d454e9}, {tid: 20210813, title: 2766767236, description: hello good evening every one, _id: 62ece09647ff077fe8d454e7}, {tid: 20210814, title: hello4, description: hello good evening every one, _id: 62ece09647ff077fe8d454e8}]

CodePudding user response：

You can use this model class

import 'dart:convert';

class ModelClass {
  final int? tid;
  final String? title;
  final String? description;
  final String? sId;
  ModelClass({
    this.tid,
    this.title,
    this.description,
    this.sId,
  });

  Map<String, dynamic> toMap() {
    final result = <String, dynamic>{};

    if (tid != null) {
      result.addAll({'tid': tid});
    }
    if (title != null) {
      result.addAll({'title': title});
    }
    if (description != null) {
      result.addAll({'description': description});
    }
    if (sId != null) {
      result.addAll({'sId': sId});
    }

    return result;
  }

  factory ModelClass.fromMap(Map<String, dynamic> map) {
    return ModelClass(
      tid: map['tid']?.toInt(),
      title: map['title'],
      description: map['description'],
      sId: map['sId'],
    );
  }

  String toJson() => json.encode(toMap());

  factory ModelClass.fromJson(String source) =>
      ModelClass.fromMap(json.decode(source));
}

And to get items

  final data = jsonDecode(response.body) as List;
      return data.map((e) => ModelClass.fromMap(e)).toList();

CodePudding user response：

You need to decode the response into json before getting values

getAllTodos(BuildContext context) async { 
 try { 
   var todos = await _homeRepo.getAllTodos(context); 
   return todoFromJson(jsonDecode(todos)); 
 }
 catch (e) { 
   Fluttertoast.showToast(msg: e.toString()); return null;
 } 
}

CodePudding user response：

You didn't phrase your question very clearly, but here's some speculation.

First, the map itself has the wrong structure. This is what the correct one looks like:

List myList = [
  {
    'tid': 20210813,
    'title': 'hello3',
    'description': 'hello good evening every one',
    '_id': '62ecc3f047ff077fe8d4549e'
  },
  {}
];

You can convert everything to a string with a simple command toString(). Do a for and call toString().

main() {
  String str = myList.toString(); // or all
  
  for (final m in myList ){
    m.toString();
  }
}

However, I assume that in your case you need to convert the maps into a model class by presenting a toJson()/fromJson() or toString()/fromString() method for conversions.