Hi, request some help on this :point_up::skin-tone...

# http4k

[Gopal S Akshintala]

Hi, request some help on this ☝🏼

[dave]

I think the basic problem here is that until you see the JSON you can't tell what the class is - so you need to be able to discriminate somehow Moshi will require a custom adapter for this to make it work - and this will require you to implement your own Configurable Moshi instance

[dave]

You can copy the Moshi class from http4k and add a custom adapter

[dave]

For writing that you will need to look at the Moshi docs

[dave]

But once it's configured you can use lenses as normal because the "mapper" inside your custom Moshi will be configured correctly for this case

[Gopal S Akshintala]

Thanks @dave that makes sense… I think for now I will settle with val pokemon = Moshi.asA(result.bodyString(), clazz.kotlin) and incrementally build upon it

[dave]

The reason is that we try to have an identical contract across all of the implementations. If you want to call asA with a type manually (and would be interested to know the exact use-case), an easy way would be to just extract your inner moshi configuration. It's a little wordy, but this will work to ensure you have the same configuration across everything

private val myInnerMoshiB = Moshi.Builder()
    .addLast(EventAdapter)
    .addLast(ThrowableAdapter)
    .addLast(ListAdapter)
    .addLast(MapAdapter)
    .asConfigurable()
    .withStandardMappings()
    .done()

private val myInnerMoshi = myInnerMoshiB.build()

object MyMoshi : ConfigurableMoshi(myInnerMoshiB)

fun <T> MyMoshi.asA(input: String, type: Type): T = myInnerMoshi.adapter<T>(type).fromJson(input)!!

[Gopal S Akshintala]

Thanks @dave I did exactly that 🙂, but sort of feels like a Hack. So wanted to check if this can be contributed to the library.

[dave]

What exactly was the use case that you needed it for BTW?

[Gopal S Akshintala]

So I am building a tool (similar to Postman on JVM) and the tool is supposed to take moshi adapters as parameters from the caller. I am using Http4k for request response and unmarshalling, but I need a customized moshi with these extra custom adapters added.
It’s a small code-base you may review this line: revoman-root/ReVoman.kt