CarouselNoSnapModel_.java

  // New attribute
  @Nullable
  private List<EpoxyModel<?>> modelsPending_List = null;

  // New method, not declared in `CarouselNoSnapModelBuilder` interface.
  public CarouselNoSnapModelBuilder add(@NonNull EpoxyModel<?> model) {
    if (model == null) {
      throw new IllegalArgumentException("model cannot be null");
    }
    if (modelsPending_List != null) {
      modelsPending_List = new ArrayList<>();
    }
    modelsPending_List.add(model);
    return this;
  }

  // New method, called by `addTo`
  private void addPendingModels() {
    if (modelsPending_List != null && modelsPending_List.size() > 0) {
      if (models_List != null && models_List.size() > 0) {
        throw new IllegalArgumentException("Need an error message");
      }
      models(modelsPending_List);
    }
  }

  @Override
  public void addTo(EpoxyController controller) {
    super.addTo(controller);
    addPendingModels(); // flush models added by DSL
    addWithDebugValidation(controller);
    if (!assignedAttributes_epoxyGeneratedModel.get(6)) {
      throw new IllegalStateException("A value is required for setModels");
    }
  }

EpoxyModelKotlinExtensions.kt

// One extenstion generated per epoxy model, ex for `CarouselItemCustomView`

// Extension on concrete implementation `CarouselNoSnapModel_` to prevent call to `CarouselItemCustomViewModelBuilder.add(model)` from DSL
// The trick is when to generate this method, how to detect carousel / nested list. What if we introduce a `NestedList` interface?
inline fun CarouselNoSnapModel_.carouselItemCustomView(
    modelInitializer:
    CarouselItemCustomViewModelBuilder.() -> Unit
) {
    add(
    CarouselItemCustomViewModel_().apply {
        modelInitializer()
    }
    )
}

MainActivity.kt

                carouselNoSnap {
                    val lastPage = 10
                    for (j in 0 until lastPage) {
                        carouselItemCustomView {
                            id("carousel $i-$j")
                            title("Page $j / $lastPage")
                        }
                    }
                }

NestedList.kt

// Epoxy model to implements to activate the nested dsl

interface NestedList {

    fun setModels(models: List<EpoxyModel<*>?>)
}