Add offline persistence support

[rrousselGit]

Riverpod should allow simple integration with offline storage solutions

A possibility is to have Riverpod serialize/deserialize the current state of a provider and send that to a database, associated with a unique key corresponding to the provider.

[JulianBissekkou]

This sounds interesting. I might give this a try.
Do you already have an idea in mind? If so can you share some classes I should look into to be able to implement a draft for this functionality?

[rrousselGit]

👋 thanks for offering to help, but this specific issue is in a bit of a unique position. I'd like to personally take care of this one

[huang12zheng]

I don't know if it's gonna be bad,
But I would say, you might want to take a look https://github.com/flutterdata/flutter_data
or
https://flutterdata.dev/docs/repositories/#architecture-overview

Finally, thank you for your library : )
(Translated above)

[rrousselGit]

This feature is not really related to what you're suggesting

What this issue involves will most likely be two bits:

• new parameters on providers for decoding/encoding:

  final provider = SomeProvider(
    (ref) {},
    name: 'unique_key',
    decode: (data) => MyClass.fromJson(data),
    encode: (value) => value.toJson(),
  );

• a way to tell ProviderScope/ProviderContainer how to obtain the encoded value of a provider

  ProviderScope(
    initialData: {
      'unique_key': { <some json> },
    },
    encoder: SomeDBEncoder(),
  ),

[ken-ng-esotec]

this sounds very interesting, is this being added to the roadmap? @rrousselGit

[chimon2000]

this sounds very interesting, is this being added to the roadmap? @rrousselGit

It is on the roadmap for https://github.com/rrousselGit/river_pod/milestone/1

[North101]

You mentioned this issue in #1168 and while the scope of this feature doesn't seem as narrow as just restoring the state after the OS kills your app, I thought you might be interested in this lib I recently made that restores the state of providers:
https://github.com/North101/flutter_riverpod_restorable

[dJani97]

@North101 the repo link does not work, so I'll leave a link to your package:

https://pub.dev/packages/flutter_riverpod_restorable