[英]Flutter/Dart Json Serialization
I am new to both Flutter and Dart and trying to convert some android studio application to use flutter if I can.我是 Flutter 和 Dart 的新手,如果可以的话,我试图将一些 android studio 应用程序转换为使用 Flutter。 I am trying to parse some simple json to learn how all of the dart/flutter features can help me.
我正在尝试解析一些简单的 json 以了解所有 dart/flutter 功能如何帮助我。
The class structure that I want to write to is:我要写入的类结构是:
class Company extends Salinas {
final String name;
Company({this.name}) : super();
factory Company.fromJson(Map<String, dynamic> json) => _$CompanyFromJson(json);
Map<String, dynamic> toJson() => _$CompanyToJson(this);
}
class Salinas {
final int id;
Salinas({this.id});
factory Salinas.fromJson(Map<String, dynamic> json) => _$SalinasFromJson(json);
Map<String, dynamic> toJson() => _$SalinasToJson(this);
}
the json string is simple json 字符串很简单
{"id":1,"name":"Acme"}
and:和:
print(company.id)is null
print(company.name) is Acme;
when I look at the Company.g.dart file there is no reference to the extended class Salinas?当我查看 Company.g.dart 文件时,没有提到扩展类 Salinas? is there a way to do this?
有没有办法做到这一点?
I'm clearly missing something.我显然错过了一些东西。
You need to define extended class properties in child constructor like this:您需要在子构造函数中定义扩展类属性,如下所示:
class Company extends Salinas {
final String name;
Company({id, this.name}) : super(id: id);
}
After you will see this result:之后你会看到这个结果:
print(company.id) is 1
print(company.name) is Acme;
class Company {
int id;
String name;
Company({this.id, this.name});
Company.fromJson(Map<String, dynamic> json) {
id = json['id'];
name = json['name'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['id'] = this.id;
data['name'] = this.name;
return data;
}
}
On the basis of JSON you have provided, you should have made a Model as above.在您提供的 JSON 的基础上,您应该已经制作了如上的模型。 After that, you can map the whole thing quite conveniently,
之后,你可以很方便地绘制整个东西,
Company company = Company.fromJson(response);
and then you are free to print然后你可以自由打印
print(company.id);
print(company.name);
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