颤振错误：列表不是映射类型的子类型

Question

我目前正在构建一个应用程序，通过医疗api读取数据，我试图解析JSON。

我为用户创建了一个模型类：

class UserModel {
  String id;
  String nome;
  MedicoModel medico;
  MedicosModel medicos;
  String token;

  String error;

  UserModel(
      {this.id, this.nome, this.token, this.medico, this.medicos, this.error});

  UserModel.fromJson(Map<String, dynamic> json)
      : id = json['login'],
        nome = json['nome'],
        token = json['token'],
        medico = MedicoModel.fromJson(json['medico']),
        medicos = MedicosModel.fromJson(json['medicos']),
        error = '';

  Map<String, dynamic> toJson() => {
        'id': id,
        'nome': nome,
        'token': token,
        'medico': medico.toJson(),
        'medicos': medicos.toJson(),
      };

  UserModel.withError(String errorValue)
      : id = null,
        nome = null,
        token = null,
        medico = null,
        medicos = null,
        error = errorValue;
}

class MedicoModel {
  String crm;
  String nome;

  MedicoModel({this.crm, this.nome});

  MedicoModel.fromJson(Map<String, dynamic> json)
      : crm = json['crm'],
        nome = json['nome'];

  Map<String, dynamic> toJson() => {
        'crm': crm,
        'nome': nome,
      };
}

class MedicosModel {
  List<MedicoModel> medicos;

  MedicosModel({this.medicos});

  MedicosModel.fromJson(Map<String, dynamic> json)
      : medicos = (json['medicos'] as List)
            .map((e) => MedicoModel.fromJson(e))
            .toList();

  Map<String, dynamic> toJson() => {
        'medicos': medicos,
      };
}

这是我试图阅读的JSON信息：

{
  "login": "12345",
  "medico": {
    "crm": "12345",
    "nome": "XXX"
  },
  "medicos": [
    {
      "crm": "12345",
      "nome": "XXX"
    }
  ],
  "token": "5ad0c78d8fc1233b48526e0893cf91c912345706",
  "nome": "XXX"
}

但是我得到的错误列表不是Map类型的子类型

如何修复此错误？

Answer 1

请看看这段代码，您需要通过以下方式更改您的代码：

 MedicosModel.fromJson(List<dynamic> jsonList)
      : medicos = jsonList['medicos']
            .map((e) => MedicoModel.fromJson(e))
            .toList();