如何在Dart中编码和解码与JSON之间的自定义对象列表？

Question

我有一个具有自己属性的doughnut类，我创建了一个doughnut对象列表，并希望在JSON中对其进行编码和解码。我怎样才能做到这一点？我已经实现了对对象本身的解析，但在尝试对这些对象的列表进行同样的解析时遇到了麻烦。

import 'package:flutter/material.dart';

class Doughnut {
  String name;
  String filling;
  List<String> toppings;
  double price;
  var days;

  Doughnut(this.name, this.filling, this.toppings, this.price,this.days);

  Doughnut.fromJson(Map<String, dynamic> json) {
    name = json['name'];
    filling = json['filling'];
    var toppingsFromJson = json['toppings'];
    toppings = new List<String>.from(toppingsFromJson);
    price = json['price'];
    var daysFromJson=json["days"];
    days=new Map<String,bool>.from(daysFromJson);
    }

  Map<String, dynamic> toJson() =>
      {"name": name, "filling": filling, 'toppings': toppings, "price": price,"days":days};
}

Answer 1

您必须对数组进行解码：

var toppingsFromJson = jsonDecode(json['toppings']);