1

Using the Todos example in TCA, if I make the todos array optional, I'm struggling to figure out how I then use the ForEach with that new optional array. I can't find a combination that works.

So in AppState I just made todos optional:

  var todos: IdentifiedArrayOf<Todo>?

So the compiler shows this error for the reducer:

Screen Shot 2020-05-24 at 7.37.16 AM
Screen Shot 2020-05-24 at 7.37.16 AM1420×234 46.2 KB

It seems the compiler has a hard time choosing the correct ForEach, and I noticed that the ForEach I need already does a return self.optional.reducer(....

2

This seems to work, but feels too verbose, am I missing something obvious?

todoReducer
    .forEach(
        state: \.self,
        action: .self,
        environment: { $0 }
    )
    .optional
    .pullback(
        state: \.todos,
        action: /AppAction.todo(id:action:),
        environment: { _ in TodoEnvironment() }
    )
3

@pcolton That's probably the most straightforward way to handle his kind of double-nesting of state. We're working on some ways of improving the ergonomics of optional and enum-based state, though, that will hopefully clean this kind of thing up in the future!

4

Are there any updates on how best to handle this?