Question 205707 in Flutter Question posted in
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Flutter – Riverpod. Value changing in multiple providers

I have a very weird scenario with my Riverpod Providers.

I have two providers, which are a list of a custom object, SiblingModel.

Here are the providers defined:

final siblingsListProviderSD = StateProvider<List<SiblingModel>>(
      (ref) => [],
);
final deleteListSiblingsProviderSD = StateProvider<List<SiblingModel>>(
      (ref) => [],
);

At certain point in the app, I am editing the data of one of the providers. Like this:

ref.read(siblingsListProviderSD.notifier).state[index].fields?.name = 'DUMMY NAME';

Now, something very strange is happening, that this value is changing in the list of both of these providers

So for example, after changing it like above, if I Print the result of both providers like this:

 print('Upload Item 1 name: ${siblingsListToUpload.first.fields?.name}');
 print('Delete Item 1 name: ${siblingsListToDelete.first.fields?.name}');

The output that I get for both is ‘DUMMY NAME’, even though I only changed the value ot eh sublingsListToUpload provider, not the other one.

Why are the values in both providers changing?

Thanks

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2

Answers


  1. Chosen as BEST ANSWER
    0

    I don't know why, but the issue was that I wasn't using copyWith.

    When I did it like this, it worked:

      ref.read(siblingsListProviderSD.notifier).state[index] =
                    ref.read(siblingsListProviderSD.notifier).state[index]
                        .copyWith(fields: ref.read(siblingsListProviderSD.notifier).state[index].fields?.copyWith(name: text));

  2. 0

    If I understand correctly, then you can try to track the problem like this:

    import "package:riverpod/riverpod.dart";

final list1 = StateProvider<List<int>>((ref) => []);
final list2 = StateProvider<List<int>>((ref) => []);

void main() {
  final container = ProviderContainer();

  container.read(list1).add(5);

  final item1 = container.read(list1);
  final item2 = container.read(list2);

  print(item1);
  print(item2);
}

    Only in this case everything works as expected. Do you have a minimal example to reproduce?

    It seems to me that your SiblingModel object is not so simple. And the problem lies precisely in it.

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