Creating new options in a select field should select the newly created record

[jcc5018]

I have a basic Country, State, City set up on my resource.

Since there are far too many cities to prepopulate, I would like this to be added by the user, but also display preexisting cities to avoid duplicate entries.

I figured out how to add a new city, but why doesnt that newly added city become the chosen selection?

And is there a way to set the modal to say "create city for {State} to help users know that they are adding a city within the correct state. On Testing, I forgot to change the state, and ended up adding the city that doesnt belong in that state.

Is there a suggested way to help verify that the entered city is correct, and give them an option to undo the addition if added accidently as I did?

Select::make('state_id')
                                                  ->label('State')
                                                  ->options(fn($get
                                                  ) => State::where('country_id',
                                                      $get('country_id'))
                                                            ->pluck('name',
                                                                'id'))
                                                  ->reactive()
                                                  ->afterStateUpdated(fn(
                                                      $state,
                                                      $set
                                                  ) => $set('city_id',
                                                      null)),
                                            // Reset city when state changes
                                            Select::make('city_id')
                                                  ->label('City')
                                                  ->options(fn($get
                                                  ) => City::where('state_id',
                                                      $get('state_id'))
                                                           ->orderBy('name')
                                                           ->pluck('name',
                                                               'id'))
                                                  ->createOptionForm([
                                                      TextInput::make('name')
                                                               ->required(),
                                                  ])
                                                  ->createOptionUsing(function (
                                                      $data,
                                                      $get
                                                  ) {
                                                      $cityData = $data
                                                                  + ['state_id' => $get('state_id')]; // Merge city data with state_id

                                                      return City::create($cityData)
                                                                 ->getKey();
                                                  }),

[dave-mills]

I was looking through the discussions to see if this issue was already highlighted. I also cannot get the newly created option to be automatically selected by the Select field. I think it might be a bug? I think we're following the docs here...

On your other question - you can pass in data from the main form to the modal form by using $get in the same way you do for the createOptionUsing method:

            
Select::make('city_id')
    ->label('City')
    // ...
    ->createOptionForm(function (Get $get, Form $form): Form {

        $stateName = State::find($get('state_id'))->name;
                
        return $form->schema([
            TextInput::make('name')
               ->label(fn() => "Add a city for the state {$stateName}" 
               ->required(),
        ];

})

I have a similar set up working (except for having the new entry auto-selected!) on Filament 3.2.96.

[remiebelingmerifond]

I know this Discussion is pretty old, but I stumbled across it while looking for a solution to the same problem.
Thought I'd drop this here in case it helps someone else down the line:

Not really a proper fix,
but there's a workaround.

Just set native(false) on the Select – that did the trick for me.

Select::make('author_id')
  ->relationship(name: 'author', titleAttribute: 'name')
  ->createOptionForm([
     // ...
  ])
  ->createOptionUsing(function (array $data): int {
    return auth()->user()->team->members()->create($data)->getKey();
  })
  // Workaround to make auto-select of freshly created Options work:
   ->native(false),

Caution!!

By setting native(false), you enable the JS-powered select.
The docs aren't particularly detailed on this point, but obviously, using this option may come with unexpected side effects.