如何比较我的两个 projectModels 对象，一个来自本地值，另一个来自未来？扑

Question

我正在尝试比较两个对象并查看它们是否具有相同的值，其中一个对象来自未来的 api 调用

ProjectModel response = await ProjectServices.fetchSingleProjectStream(
        projectId: projectId,
      );

另一个来自本地值，我用另一个 api 调用我调用的 onInit()

final _projectModel = ProjectModel(
    guid: '',
    projectColor: '',
    title: '',
    tags: [],
    tasks: [],
    teamMembers: [],
  ).obs;

  fetchSingleProject() async {
    try {
      if (_projectModel.value.tasks!.isEmpty) {
        _isLoading(true);
      }
      ProjectModel response = await ProjectServices.fetchSingleProjectStream(
        projectId: projectId,
      );
      print('from local: ${_projectModel.value.tasks![0].description}');
      print('from api: ${response.tasks![0].description}');
      // var shouldReload = projectModel.tasks!
      //     .any((element) => _projectModel.value.tasks!.contains(element));
      // bool shouldReload = response.tasks == _projectModel.value.tasks;
      const DeepCollectionEquality dc = DeepCollectionEquality.unordered();
      bool shouldReload = dc.equals(
        response.tags!.toList(),
        _tagsList.toList(),
      );
      print('should the stream reload: $shouldReload');
      if (shouldReload) {
        _projectModel.value = response;
        _tagsList.assignAll(response.tags!);
      }
    } catch (e) {
      throw Get.snackbar('Opss', 'An error occourred');
    } finally {
      _isLoading(false);
    }
  }

  fetchInitialProject() async {
    try {
      _isLoading(true);
      ProjectModel response = await ProjectServices.fetchSingleProjectStream(
        projectId: projectId,
      );
      _projectModel.value = response;
      _tagsList.assignAll(response.tags!);
    } catch (e) {
      throw Get.snackbar('Error', '$e');
    } finally {
      _isLoading(false);
    }
  }

  @override
  Future<void> onInit() async {
    if (_projectModel.value.tasks!.isEmpty) await fetchInitialProject();
    super.onInit();
  }

  @override
  void onReady() {
    timer = Timer.periodic(const Duration(seconds: 3), (timer) async {
      await fetchSingleProject();
    });
    super.onReady();
  }

当我打印每个对象的值时，它们的结果是一样的，但结果是错误的，为什么会这样，我该如何解决？

      print('from local: ${_projectModel.value.tasks![0].description}');
      print('from api: ${response.tasks![0].description}');
---
flutter: from local: This is an autogenerated #tbd, @ShemsedinRaketa
flutter: from api: This is an autogenerated #tbd, @ShemsedinRaketa
---

尝试比较 tasksList 的方法 1:

bool shouldReload = response.tasks == _projectModel.value.tasks;

// returns false

尝试比较 tasksList 的方法 2:

// importing form the collection package
      const DeepCollectionEquality dc = DeepCollectionEquality.unordered();
      bool shouldReload = dc.equals(
        response.tags!.toList(),
        _tagsList.toList(),
      );
// returns false as well

尝试比较 tasksList 的方法 3:

      var shouldReload = projectModel.tasks!
          .any((element) => _projectModel.value.tasks!.contains(element));
// even if all the values are not the same it still returns true when 
// only one of the values matches
// flutter: from local: This is an autogenerated #tbd,
// @ShemsedinRaketa
// flutter: from api: This is an autogenerated #tbd, @ShemsedinRaketa poakdhmnbs
// flutter: should the stream reload: true

我想用它实现的是一个流，我希望能够控制何时加载来自 api 的新数据，何时加载来自 api 的数据api 与本地相同则不更新 UI.

Answer 1

bool areEqual(List<Person> a, List<Person> b){
  for(int i = 0;i<a.length;i++){
    if(a[i].id != b[i].id){
      return false;
    }
  }
  return true;
}

void main(){
List<Person> a = [Person(),Person()];
List<Person> b = [Person(),Person()];
}

这就是您的函数的样子，但请将其更改为您的对象不是人，值不是 id，而是对你的描述

如何比较我的两个 projectModels 对象，一个来自本地值，另一个来自未来？扑

How to compare my two projectModels objects one is from a local value and the other from a future? flutter

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