在TornadoFX中，如何在ItemViewModel的可为空属性上选择一个深度嵌套的属性？

Question

TornadoFX has an select function that is used to access a property within a property. For example, the usage would be:

textfield(viewModel.customerProperty.select(Customer::nameProperty))

And that works fine, however, in case that the customerProperty 's value is nullable ( Customer? ), select doesn't work, because it expects non-null object to "select" from.

In case that the Property has nullable value, how can select be used on it?

Answer 1

You don't need to declare the type as nullable even though the property can contain null. Simply change the type of the property and you should be good.