Adding implemenatation of From trait to Model for derived signals

[kandrelczyk]

Hi,

I'm trying to do something like that:

let error : RwSignal<Option<SomeError>> = create_rw_signal(None);
let show_error = Signal::derive(move||error.get().is_some()); 

<Modal title="title" show=show_error>
   { display error}
</Modal> 

This didn't work because show has type Model and you can't create Model from derived signal.

I've added the From<Signal<T>> for Model<T> implementation and it's working now.

Is this a good approach? I think especially for components like Modal handling derived signal is very useful but maybe there's better way to do it.

[luoxiaozero]

Why does read call get here? If you did this on purpose, why not change it to:

let error : RwSignal<Option<SomeError>> = create_rw_signal(None);
let show_error = Signal::derive(move||error.get().is_some()); 

<Modal title="title" show=show_error.get()>
   { display error}
</Modal>

If not, you can change it to ``

impl<T> From<(Signal<T>, Option<WriteSignal<T>>)> for Model<T>

Because I wrote the Model to extend the behavior of RwSignal, I used tuples to distinguish the extended behavior.

[kandrelczyk]

You're right, show=show_error.get() works fine. Don't know why I though this will not get updated on signal change. I will just close this. sorry.

[kandrelczyk]

Closing since it's not needed.