Flutter/Dart解析JSON以使用Map属性建模

Question

我的API返回这种json对象其中区域键是动态的

{
"workspaces": [
{
"id": "1154237e8b6-7270-4c99-81e9-9d752e0c295c",
"createdAt": "2022-05-08T15:43:25.440Z",
"updatedAt": "2022-05-08T15:43:25.440Z",
"siteId": "42cb1511-e836-45ed-9b56-034668b8f05a",
"orgId": "bb46311b-b76c-4f6a-9726-65ab5730b69b",
"name": "RDC"
}
],
"zones": {
"134528b6-7270-4c99-81e9-9d752e0c295c": [
{
"id": "71a11d9e-e211-472b-a16d-861737c57ecd",
"createdAt": "2022-05-08T15:43:25.451Z",
"updatedAt": "2022-05-08T15:43:25.451Z",
"siteId": "421158b-e836-45ed-9b56-034668b8f05a",
"orgId": "bb4631b-b76c-4f6a-9726-65ab5730b69b",
"workspaceId": "13a7e8b6-7270-4c99-81e9-9d752e0c295c",
"name": "Auditorium"
}
],
"15a745326-7270-4c99-81e9-9d752e0c295c": [
{
"id": "71ad31e-e211-472b-a16d-861737c57ecd",
"createdAt": "2022-05-08T15:43:25.451Z",
"updatedAt": "2022-05-08T15:43:25.451Z",
"siteId": "42cb158b-e836-45ed-9b56-034668b8f05a",
"orgId": "b11b8b-b76c-4f6a-9726-65ab5730b69b",
"workspaceId": "1318b6-7270-4c99-81e9-9d752e0c295c",
"name": "Auditorium"
}
]
}
}

我想有一个将json转换为SiteHierarchyModel的模型我正在努力转换这种属性Map<String, List<ZoneModel>>

class SiteHierarchyModel {
List<WorkspaceModel> workspaces;
Map<String, List<ZoneModel>> zones;
SiteHierarchyModel({
required this.workspaces,
required this.zones,
});
Map<String, dynamic> toJson() => {
'workspaces': workspaces,
'zones': zones,
};
SiteHierarchyModel.fromJson(Map<String, dynamic> json)
: workspaces = List<WorkspaceModel>.from(json['workspaces']
.map((workspace) => WorkspaceModel.fromJson(workspace))),
zones = json['zones']; // THIS LINE
}

Answer 1

您也可以在https://app.quicktype.io/上尝试。这个站点很容易将JSON转换为dart模型类。有许多不同的语言支持

import 'dart:convert';
SiteHierarchyModel siteHierarchyModelFromJson(String str) => SiteHierarchyModel.fromJson(json.decode(str));
String siteHierarchyModelToJson(SiteHierarchyModel data) => json.encode(data.toJson());
class SiteHierarchyModel {
SiteHierarchyModel({
this.workspaces,
this.zones,
});
List<Workspace> workspaces;
Map<String, List<Workspace>> zones;
factory SiteHierarchyModel.fromJson(Map<String, dynamic> json) => SiteHierarchyModel(
workspaces: List<Workspace>.from(json["workspaces"].map((x) => Workspace.fromJson(x))),
zones: Map.from(json["zones"]).map((k, v) => MapEntry<String, List<Workspace>>(k, List<Workspace>.from(v.map((x) => Workspace.fromJson(x))))),
);
Map<String, dynamic> toJson() => {
"workspaces": List<dynamic>.from(workspaces.map((x) => x.toJson())),
"zones": Map.from(zones).map((k, v) => MapEntry<String, dynamic>(k, List<dynamic>.from(v.map((x) => x.toJson())))),
};
}
class Workspace {
Workspace({
this.id,
this.createdAt,
this.updatedAt,
this.siteId,
this.orgId,
this.name,
this.workspaceId,
});
String id;
DateTime createdAt;
DateTime updatedAt;
String siteId;
String orgId;
String name;
String workspaceId;
factory Workspace.fromJson(Map<String, dynamic> json) => Workspace(
id: json["id"],
createdAt: DateTime.parse(json["createdAt"]),
updatedAt: DateTime.parse(json["updatedAt"]),
siteId: json["siteId"],
orgId: json["orgId"],
name: json["name"],
workspaceId: json["workspaceId"] == null ? null : json["workspaceId"],
);
Map<String, dynamic> toJson() => {
"id": id,
"createdAt": createdAt.toIso8601String(),
"updatedAt": updatedAt.toIso8601String(),
"siteId": siteId,
"orgId": orgId,
"name": name,
"workspaceId": workspaceId == null ? null : workspaceId,
};
}