Is there any documentation around `CacheKeyResolver` and `fromFieldRecordSet` and `fromFieldArgument...

# apollo-kotlin

[wasyl]

Is there any documentation around CacheKeyResolver and fromFieldRecordSet and fromFieldArguments methods?
fromFieldRecordSet seems like it asks for cache key for every object (non-scalar) in the response? But what does fromFieldArguments do?

[mbonnin]

There's not much unfortunately, mostly because we should really change these APIs

[mbonnin]

We have this but I guess you know already? https://www.apollographql.com/docs/android/essentials/normalized-cache/#using-the-cache-with-your-queries

[mbonnin]

From the exemple there:

query AuthorById($id: String!) {
  author(id: $id) {
      id
      name
    }
  }
}

[mbonnin]

fromFieldArguments tells the cache to use the id from the arguments

[mbonnin]

fromFieldRecordSet tells the cache to use the id from the response

[wasyl]

I suspected something like that but didn’t see it explicitly. So the fromFieldArguments has preference over fromFieldRecordSet when computing cache for the object directly under a field?

In your example, if fromFieldArguments returns the ID, does fromFieldRecordSet still need to run?

[mbonnin]

They run at different time. fromFieldArguments will run before the network to check if there's something in the cache. fromFieldRecordSet will run after to store the value in the cache

[wasyl]

Got it, thank you 🙂