Manage func itemViewModel(fromModel model: ModelType) -> ItemViewModelType? { into class ModelPickerViewModel

[Andreoid82]

func itemViewModel(fromModel model: ModelType) -> ItemViewModelType? {
    switch model {
        //Example to customize picker for particular models
    //case let model as Product : return ListItemViewModel(product: model)
    case let model as ModelWithTitle : return ListPickerElementItemViewModel(model: model)
    default : return model as? ItemViewModelType
    }
}