Dataclasses.kt

// this will generate PersonAdapter.kt
@JsonClass(generateAdapter = true)
data class Person(
    val name: String,
    val age: Int,
    val phone: Phone
)

class PersonAdapterFactory : JsonAdapter.Factory {
   overridee fun create(type: Type, moshi: Moshi) = 
      if (type == Person::class.java) PersonAdapter(moshi) else null
}

// this will generate PhoneAdapter.kt
@JsonClass(generateAdapter = true)
data class Phone(
    val mobile: String,
    val home: String,
    val office: String
)

class PhoneAdapterFactory : JsonAdapter.Factory {
   overridee fun create(type: Type, moshi: Moshi) = 
      if (type == Phone::class.java) PhoneAdapter(moshi) else null
}