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@Benjiko99
Created December 6, 2019 09:59
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Moshi Adapter. Fields annotated with @JsonNullable will be serialized as `null` instead of being ignored.
@Retention(AnnotationRetention.RUNTIME)
@JsonQualifier
annotation class JsonNullable
/**
* Fields annotated with @JsonNullable will be serialized as `null` instead of being ignored.
*/
class JsonNullableAdapter : JsonAdapter.Factory {
override fun create(type: Type, annotations: MutableSet<out Annotation>, moshi: Moshi): JsonAdapter<Any>? {
val nextAnnotations = nextAnnotations(annotations, JsonNullable::class.java) ?: return null
return moshi.nextAdapter<Any>(this, type, nextAnnotations).serializeNulls()
}
}
@Benjiko99
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Setup:

val moshi = Moshi.Builder()
    .add(JsonNullableAdapter())
    .build()

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