CODEWITHSUNDEEP
jsonkotlinmoshi
Jmh2013
Jmh2013

Reputation: 2777

Moshi custom adapter convert json mirror class to another

In the Moshi documentation it states the ability to create a class that mirrors the shape of the JSON and then a custom adapter to tell it how to convert that class to another in the desired shape. I'm trying to do that, but it's as if the custom adapter isn't being executed.

My custom adapter looks like this: 

class LocationJsonAdapter {

    @FromJson
    fun fromJson(locationJson: LocationJson): Location {
        val location = Location()

        location.city.name = locationJson.city.name.en
        location.country.name = locationJson.country.name.en
        location.continent.name = locationJson.continent.name.en

        location.subdivisions.forEachIndexed {index, subdivision ->
            subdivision.name = locationJson.subdivisions[index].name.en
        }

        return location;
    }
}

I'm adding the adapter to Moshi here

val moshi = Moshi.Builder().add(KotlinJsonAdapterFactory()).add(LocationJsonAdapter()).build()
val jsonAdapter: JsonAdapter<Location> = moshi.adapter(Location::class.java)

val location: Location? = jsonAdapter.fromJson(data)
println(location)

If I understand the documentation correctly, it's supposed to convert the json to a LocationJson object and use the custom adapter to then convert the LocationJson object into a Location object. Am I doing something wrong here?

Upvotes: 1

Views: 903

Answers (1)

Jmh2013
Jmh2013

Reputation: 2777

When adding the custom adapter to the Moshi builder, the KotlinJsonAdapterFactory() always has to go last. Adding it last fixed the issue

val moshi = Moshi.Builder().add(LocationJsonAdapter()).add(KotlinJsonAdapterFactory()).build()

Upvotes: 3

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