Can't save anything to storage

Current behavior

I get an error when trying to save anything but a string.

Expected behavior

To be able to save objects.

Repro steps

I tried saving the object from the docs:

const legacyStorage = new LegacyStorage()

type StorageModel = {
  user: {
    name: string
    age: number
  }
}

const storage = AsyncStorageFactory.create<StorageModel>(legacyStorage)

async function saveItem() {
  const myUser = {
    name: 'John',
    age: 22
  };
  
  await storage.set('user', myUser);
}

// Somewhere else...

saveItem()

Environment

• Async Storage version: ^2.0.0-rc.2
• React-Native version: 0.61.5
• Platform tested: iOS
• Logs/Error that are relevant:

WARN  [AsyncStorageLegacy] The value for key "user" is not a string. This can lead to unexpected behavior/errors. Consider stringifying it.
Passed value: [object Object]
Passed key: user

If I change StorageModel to

type StorageModel = {
  user: string
}

and stringify the object before saving, it works (and I can also read it back, as a string, of course). But that’s not really what I’d expect 😞

[rolandleth]

OK, understood 👍🏻

Thanks for all the explanations!

[rolandleth]

Thanks for the quick reply!

Sadly, I don’t have too much JS experience to acknowledge all the implications of serialization and/or have any suggestions; I’d probably stringify it.

What about using an SQLite database, like on Android? If it’s possible there, should be possible here as well, since iOS supports it as well?

Perhaps we can set expectations with better documentation?

If it’s truly no way to do it, I suppose so, because that piece of code definitely looks like it should save 🙃