Demonstrating an EpoxyGroupModel implementation and what I would like to do if possible.

PrescriptionCardListController.kt

/**
 * This class is the current implementation.
 * 
 * Notice that in [addPendingPrescriptionCard] and [addActivePrescriptionCard],
 * we have relatively identical code:
 * 
 * 1. Create the group.
 * 2. Create all the models and add them to the group.
 * 3. Add the group to the main controller.
 * 
 * Whe I'm looking for is a way to avoid some of that duplicate code, and
 * just be able to apply the models or something. 
 */
class PrescriptionCardListController : TypedEpoxyController<AccountPrescriptionsDisplayModel>() {

    override fun buildModels(data: AccountPrescriptionsDisplayModel) {
        data.pendingPrescriptions.let(this::addPendingPrescriptionCard)

        data.activePrescriptions.forEach(this::addActivePrescriptionCard)
    }

    private fun addPendingPrescriptionCard(pendingPrescriptions: List<PendingPrescriptionDisplayModel>) {
        val groupModel = GroupModel_()
            .id("PENDING_PRESCRIPTIONS_CARD")
            .layout(R.layout.epoxy_list_card)
        
        pendingPrescriptions.forEach { prescription ->
            val prescriptionModel = PendingPrescriptionEpoxyModel_()
                .id(prescription.prescriptionId)
                .prescription(prescription)
                
            groupModel.add(prescriptionModel)
        }
        
        groupModel.addTo(this)
    }

    private fun addActivePrescriptionCard(displayModel: ActivePatientPrescriptionsDisplayModel) {
        val patientId = displayModel.patient.patientId

        val groupModel = GroupModel_()
            .id("PRESCRIPTION_CARD_$patientId")
            .layout(R.layout.epoxy_list_card)

        displayModel.activePrescriptions.forEach { prescription ->
            val prescriptionModel = ActivePrescriptionEpoxyModel_()
                .id(prescription.prescriptionId)
                .prescription(prescription)

            groupModel.add(prescriptionModel)
        }

        groupModel.addTo(this)
    }

    /**
     * Something like this would be reusable - if I could subclass EpoxyGroupModel
     * and maybe define the same layout for every group, I could avoid some boilerplate.
     * 
     * Maybe this isn't possible and the above is the "right" way?
     */
    private fun whatIWantToDo() {
        EpoxyCardGroupModel_()
            .id("SomeId")
            .layout(R.layout.epoxy_list_card)
            .models(addModelsHere)
            .addTo(this)
    }
}