我真的很困惑，我如何添加导演模型到我的节目模型。我正在用Flutter编写Android应用程序，它使用本地Django Rest API。
这是Django中的Director Model

class Director(models.Model):
    name = models.CharField(max_length=20)
    surname = models.CharField(max_length=20)
    country = models.CharField(max_length=20)
    image = models.ImageField(null=True, blank=True, upload_to="images/")

这是在Django中显示模型

class Show(models.Model):
    name = models.CharField(max_length=50)
    annotation = models.TextField(max_length=1000)
    language = models.CharField(max_length=20, null=True)
    image = models.ImageField(null=True, blank=True, upload_to="images/")
    director = models.ForeignKey(Director, on_delete=models.CASCADE, null=True)

这是Flutter中的Director Model

import 'package:flutter/widgets.dart';

class DirectorModel with ChangeNotifier {
  final int id;
  final String name;
  final String surname;
  final String image;

  DirectorModel({required this.id, required this.name, required this.surname, required this.image});

  factory DirectorModel.fromJson(dynamic json) {
    return DirectorModel(
      id: json['id'],
      name: json['name'] as String,
      surname: json['surname'] as String,
      image: json['image'] as String,
    );
  }

  static List<DirectorModel> directorFromSnapshot(List snapshot) {
    return snapshot.map((data) {
      return DirectorModel.fromJson(data);
    }).toList();
  }
}

这是在Flutter中显示模型

import 'package:flutter/widgets.dart';
import 'package:kulises_app/models/directors.dart';

class ShowsModel with ChangeNotifier {
  int id;
  String name;
  String annotation;
  String language;
  DirectorModel director;
  String image;

  ShowsModel(
      {required this.id,
      required this.name,
      required this.annotation,
      required this.language,
      required this.director,
      required this.image});

  factory ShowsModel.fromJson(dynamic json) {
    return ShowsModel(
      id: json['id'],
      director: DirectorModel.fromJson(json['director']),
      name: json['name'] as String,
      annotation: json['annotation'] as String,
      language: json['language'] as String,
      image: json['image'] as String,
    );
  }

  static List<ShowsModel> showsFromSnapshot(List snapshot) {
    print(snapshot);
    return snapshot.map((data) {
      return ShowsModel.fromJson(data);
    }).toList();
  }

}

我在这行director: DirectorModel.fromJson(json['director']),上得到这个错误_TypeError (type 'int' is not a subtype of type 'Map<String, dynamic>')。这么小的一个错误，我真的想不通……
这个想法是-我有这个信息页面上的一个节目，我需要显示导演的名字和姓氏。