How to use Identified NavigationLink with BindingAction child

[Berhtulf]

Hello,
I have looked at NavigateAndLoadList Case Study and implemented it into my app, sice I was looking for any NavigationLink inside ForEach solution.

Navigation is working, but now when I try to use .binding() from child reducer, I got the following error
A binding action sent from a view store at "ParentFeature/ParentFeatureView.swift:38" was not handled:

I looked around and found this Q&A #575, but that's without the binding part.

Any advice, how to fix this? Thanks!

public struct ParentFeatureState: Equatable {
    ...
    var selection: Identified<FormType.ID, ChildFormState>?
    ....
}

public let parentReducer = Reducer<State, Action, Environment>.combine(
    childFormReducer
        .pullback(state: \Identified.value, action: .self, environment: { $0 })
        .optional()
        .pullback(
            state: \ParentState.selection,
            action: /ParentAction.childForm,
            environment: { ... }
        ),
    .init { state, action, environment in
        switch action {
        ...
        case let .setNavigation(selection: .some(id)):
            state.selection = ...
            return .none

        case .setNavigation(selection: .none):
            state.selection = nil
            return .none

        case .setShowingForm(let isPresenting):
            state.isFormActive = isPresenting
            state.childFormState = isPresenting ? .init() : nil
            return .none

        case .childForm: return .none
        }
    }
)

View:

List {
    ForEach(viewStore.children) { child in
        NavigationLink(
            destination: IfLetStore(
                store.scope(
                    state: \.selection?.value,
                    action: ParentAction.childForm
                ), then: ChildFormView.init(store:)),
            tag: child.id,
            selection: viewStore.binding(
                get: \.selection?.id,
                send: ParentAction.setNavigation(selection:)
            )
        ) {
            Text(child.name)
        }
    }
}

Child reducer:

public let childFormReducer = Reducer<ChildFormState, ChildFormAction, ChildFormEnvironment>.combine(
    .init { state, action, environment in
        switch action {
        ...
        case .binding: return .none
        }
    }
    .binding()
)

[Berhtulf]

My fault, the error was caused by my implementation.

I had a separate NavigationLink inside toolbar, not using the selection property inside State and because of that, it was not connected to the reducer.