BindableDerivedListAttribute with a .BindEx( this, x => x.MyDerivedList) extension method

[ChaseFlorell]

Is your feature request related to a problem? Please describe.

I'm a huge fan of leveraging the Rx Fody attributes in order to make my app clean and terse. One area That I'd love to see further improvement is around derived lists. Currently my derived list code looks like this.

ctor()
{
    this.WhenAnyValue(vm => vm.People)
        .Subscribe(people => people
            .ToObservableChangeSet()
            .AutoRefresh(x => x.Deleteed)
            .Filter(x => !x.Deleted)
            .Bind(out _visiblePeople)
            .Subscribe());
}

private ReadOnlyObservableCollection<Person> _visiblePeople;
public ReadOnlyObservableCollection<Person> VisiblePeople => _visiblePeople;

Describe the solution you'd like

What I'd love to be able to do is clean it up and remove the backing field

ctor()
{
    this.WhenAnyValue(vm => vm.People)
        .Subscribe(people => people
            .ToObservableChangeSet()
            .AutoRefresh(x => x.Deleted)
            .Filter(x => !x.Deleted)
            .BindEx(this, x => x.VisiblePeople)
            .Subscribe());
}

public ReadOnlyObservableCollection<Person> VisiblePeople { [BindableDerivedList] get; };

Describe alternatives you've considered

Describe suggestions on how to achieve the feature

Additional context

This would very much be akin to the existing ObservableAsPropertyAttribute

[open-collective-bot]

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[ChaseFlorell]

Also, if I'm just missing something that's already there, then my suggestion would be to improve the documentation as this is all I'm able to go off of.
https://reactiveui.net/docs/handbook/collections/

Collections

[RLittlesII]

@ChaseFlorell Is this more of a request for DynamicData?

[ChaseFlorell]

@RLittlesII ultimately it's a request for the ReactiveUI.Fody bits.

[glennawatson]

User wants a fody for dynamic data.

[RLittlesII]

@ChaseFlorell I think this is doable. We have some work coming up soon around Fody. So we can evaluate this when we target that work.

[RolandPheasant]

I am not sure what is required? Is it still relevant? If so please reopen and let's discuss further.

[github-actions]

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