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我有一个 API，它返回的响应类似于本文中显示的响应。

我的响应返回列表中的对象，该对象仅包含一个 $ref 变量，该变量指向列表中某处具有相关 $id 的子对象。

我尝试了以下方法，但它不适用于更大更复杂的响应，我怀疑它会大大增加计算时间：

Future<List<Category>> getCategories() async {
String token = await FlutterSession().get("accessToken");
final response =
    await http.get('$url/api/categories/', headers: <String, String>{
  'Content-Type': 'application/x-www-form-urlencoded',
  'Authorization': 'Bearer  ' + token,
});

if (response.statusCode == 200) {
  categories = categoriesFromJson(response.body);
  var incompleteCats = categories.where((c) => c.id == null);
  incompleteCats.forEach((ic) {
    categories.remove(ic);
    var completeCat =
        categories.where((s) => s.parent?.$id == ic.$ref).first.parent;
    categories.add(completeCat);
  });
  return categories;
} else {
  throw Exception('Failed to get categories');
}

}

API 响应示例

[
{
    "$id": "3",
    "Parent": {
        "$id": "4",
        "Parent": {
            "$ref": "1"
        },
        "CategoryName": "General",
        "Description": "Test",
        "ParentCategoryId": 45,
        "SortOrder": 2,
        "Id": 49,
        "IsDeleted": false,
        "CreatedDate": "2009-11-29T00:00:00",
        "CreatedByUserId": 1,
        "UpdatedDate": "1900-01-01T00:00:00",
        "UpdatedByUserId": null,
        "State": 0
    },
    "CategoryName": "Country",
    "Description": "Test",
    "ParentCategoryId": 49,
    "SortOrder": 3,
    "Id": 47,
    "IsDeleted": false,
    "CreatedDate": "2019-11-29T00:00:00",
    "CreatedByUserId": 1,
    "UpdatedDate": "1900-01-01T00:00:00",
    "UpdatedByUserId": null,
    "State": 0
},
{
    "$id": "16",
    "Parent": {
        "$ref": "4"
    },
    "CategoryName": "Other",
    "Description": "Other",
    "ParentCategoryId": 49,
    "SortOrder": 7,
    "Id": 61,
    "IsDeleted": false,
    "CreatedDate": "2020-06-05T09:13:50.863",
    "CreatedByUserId": 1,
    "UpdatedDate": "2020-06-05T09:13:50.863",
    "UpdatedByUserId": 1,
    "State": 0
},
{
    "$ref": "4"
},

]

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