arrays - Flutter - 来自 API 的嵌套 json

Question

我还是 Flutter 开发的新手，最近我一直在尝试调用 API。我已经设法做到了，而无需将数据放入模型中，并且效果很好。问题是当我尝试序列化数据时。我使用webinover创建了一个模型

https://run.mocky.io/v3/5c648026-c95a-4cf8-9a14-79f13cfb29d3

json数据

{
"problems": [{
    "Diabetes":[{
        "medications":[{
            "medicationsClasses":[{
                "className":[{
                    "associatedDrug":[{
                        "name":"asprin",
                        "dose":"",
                        "strength":"500 mg"
                    }],
                    "associatedDrug#2":[{
                        "name":"somethingElse",
                        "dose":"",
                        "strength":"500 mg"
                    }]
                }],
                "className2":[{
                    "associatedDrug":[{
                        "name":"asprin",
                        "dose":"",
                        "strength":"500 mg"
                    }],
                    "associatedDrug#2":[{
                        "name":"somethingElse",
                        "dose":"",
                        "strength":"500 mg"
                    }]
                }]
            }]
        }],
        "labs":[{
            "missing_field": "missing_value"
        }]
    }],
    "Asthma":[{}]
}]}

这是我的代码问题_models

class AllProblem {
 late List<Problem>? problems;

 AllProblem({this.problems});
  AllProblem.fromJson(Map<dynamic, dynamic> json) {
    if (json['problems'] != null) {
      problems =  <Problem>[];
      json['problems'].forEach((v) { problems!.add( Problem.fromJson(v)); });
    }
  }
}

class Problem {
 late List<Diabete> diabetes;
 late List<Asthma> asthma;

  Problem.fromJson(Map<dynamic, dynamic> json) {
    if (json['Diabetes'] != null) {
      diabetes =  <Diabete>[];
      json['Diabetes'].forEach((v) { diabetes.add( Diabete.fromJson(v)); });
    }
    if (json['Asthma'] != null) {
      asthma = <Asthma>[];
      json['Asthma'].forEach((v) { asthma.add( Asthma.fromJson(v)); });
    }
  }

}

class Diabete {
 late List<Medication> medications;
 late List<Labs> labs;

  Diabete.fromJson(Map<dynamic, dynamic> json) {
    if (json['medications'] != null) {
      medications = <Medication>[];
      json['medications'].forEach((v) { medications.add( Medication.fromJson(v)); });
    }
    if (json['labs'] != null) {
      labs = <Labs>[];
      json['labs'].forEach((v) { labs.add( Labs.fromJson(v)); });
    }
  }

}

class Medication {
late  List<MedicationsClass> medicationsClasses;


  Medication.fromJson(Map<dynamic, dynamic> json) {
    if (json['medicationsClasses'] != null) {
      medicationsClasses = <MedicationsClass>[];
      json['medicationsClasses'].forEach((v) { medicationsClasses.add( MedicationsClass.fromJson(v)); });
    }
  }


}

class MedicationsClass {
 late List<ClassName> className;
 late List<ClassName> className2;

  MedicationsClass.fromJson(Map<dynamic, dynamic> json) {
    if (json['className'] != null) {
      className = <ClassName>[];
      json['className'].forEach((v) { className.add( ClassName.fromJson(v)); });
    }
    if (json['className2'] != null) {
      className2 = <ClassName>[];
      json['className2'].forEach((v) { className2.add( ClassName.fromJson(v)); });
    }
  }

}

class ClassName {
 late List<AssociatedDrug> associatedDrug;
 late List<AssociatedDrug> associatedDrug2;



  ClassName.fromJson(Map<dynamic, dynamic> json) {
    if (json['associatedDrug'] != null) {
      associatedDrug = <AssociatedDrug>[];
      json['associatedDrug'].forEach((v) { associatedDrug.add( AssociatedDrug.fromJson(v)); });
    }
    if (json['associatedDrug#2'] != null) {
      associatedDrug2 = <AssociatedDrug>[];
      json['associatedDrug#2'].forEach((v) { associatedDrug2.add( AssociatedDrug.fromJson(v)); });
    }
  }
}

class AssociatedDrug {
 late String name;
  String? dose;
 late String strength;

  AssociatedDrug.fromJson(Map<dynamic, dynamic> json) {
    name = json['name'];
    dose = json['dose'];
    strength = json['strength'];
  }
}

class Labs {
 late String missingField;

  Labs.fromJson(Map<dynamic, dynamic> json) {
    missingField = json['missing_field'];
  }

}

class Asthma {
  Asthma();
Asthma.fromJson(Map<dynamic, dynamic> json) {
}

Map<dynamic, dynamic> toJson() {
  final Map<dynamic, dynamic> data =  <dynamic, dynamic>{};
  return data;
}
}

resposiory_problem

import 'package:mvvp_simple/model/problems_model.dart';

abstract class ProblemsRepository{
  Future<List<AllProblem>> getAllProblem();
}

这是 resposiory_problem_API

import 'dart:convert';
import 'package:mvvp_simple/model/problems_model.dart';
import 'package:mvvp_simple/repository/problem/problems_repository.dart';
import 'package:http/http.dart' as http;

class ProblemsAPI extends ProblemsRepository{

  //late AllProblem allProblem;
  @override
  Future<List<AllProblem>> getAllProblem() async{
    List<AllProblem> problemList =[];
    var apiURl = 'https://run.mocky.io/v3/5c648026-c95a-4cf8-9a14-79f13cfb29d3';
    var response = await http.get(Uri.parse(apiURl));
    if (response.statusCode == 200) {
     var data  = await jsonDecode(response.body.toString());
     problemList = data.map((problems)=> AllProblem.fromJson(problems));

     for(Map i in data){
       problemList.add(AllProblem.fromJson(i));
     }
     print(problemList);
    }
    return problemList;
  }

}

获取数据的小部件

child: FutureBuilder(
                  future: HomeViewModel().fetchAllProblem(),
                  builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
                    if (snapshot.connectionState == ConnectionState.waiting) {
                      return const Loading();
                    } else {
                      print('this data loaded ${snapshot.data}' );
                      var problems = snapshot.data;
                      return Center(
                          child: ListView.builder(
                            itemCount: problems?.length,
                            itemBuilder: (context, index) =>  const ListTile(title: Text('Problem'),subtitle: Text('Medications'),),
                          ));
                    }
                  },
                ))