A generic kotlin utility class to convert a realm list with parceler

RealmListParcelConverter.kt

/**
 * Java code from https://gist.github.com/patloew/bc32a2a1a3c0097e9c7020192fb2c78f
 * used and converted to Kotlin with some modifications
 */
open class RealmListParcelConverter<T> : TypeRangeParcelConverter<RealmList<T>, RealmList<T>> where T : io.realm.RealmObject{

    override fun toParcel(input: RealmList<T>?, parcel: Parcel) {
        if (input == null) {
            parcel.writeInt(NULL)
        } else {
            parcel.writeInt(input.size)
            for (item in input) {
                parcel.writeParcelable(Parcels.wrap(item), 0)
            }
        }
    }

    override fun fromParcel(parcel: Parcel): RealmList<T> {
        val size = parcel.readInt()
        val list = RealmList<T>()

        for (i in 0..size - 1) {
            val parcelable = parcel.readParcelable<Parcelable>(javaClass.classLoader)
            list.add(Parcels.unwrap<Any>(parcelable) as T)
        }

        return list
    }

    companion object {
        private val NULL = -1
    }
}

//Usage: class FooParcelConverter: RealmListParcelConverter<Foo>() 
//Foo: RealmObject() {...}