Question 270251 in Flutter Question posted in
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Why do we have to make a copy of the state in Flutter Riverpod State Notifier

My Flutter Riverpod State Notifier maintains an array of more than 10000 large objects. One of the properties of the object is a boolean flag isFavorite. The flag toggles value when the user clicks a button.

Now, should I necessarily make a clone of the entire object array in order to trigger a state change notification? This seems to be wasteful of resources when only a single bit has changed. Is there a more efficient way to just change the flag in one object and force Riverpod to take notice?

Is there a Riverpod-equivalent of setState() in Stateful Widgets ?

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  1. 0

    Is there a Riverpod-equivalent of setState() in StatefulWidgets ?

    You can use useState from flutter_hooks package. The Riverpod documentation suggests to AVOID using providers for local widget state, and mentioned flutter_hooks as one solution to be considered.

    You can then replace flutter_riverpod package with hooks_riverpod, and use the hooks inside HookConsumerWidget which allows you to use both hooks and Riverpod.

    More about Riverpod+hooks: https://riverpod.dev/docs/concepts/about_hooks

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  2. 0

    You can override updateShouldNotify in your Notifier subclass to use equality rather than identity, and ensure that your state has a valid equality (overridden == and hashCode). Then, you will never need to copy your state, just be sure to call ref.notifyListeners for any possible mutations.

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