Get $get data in other section from an another section in filament

Certainly! In Filament, if you want to access the state of one field (like meta.number_of_units) within another section (such as to set the default value/count for a Repeater), you need to use a closure for the default, columns, or similar property, and use the $get helper to retrieve the value.

Let’s assume you have two sections:

• Section 1: Property details, including meta.contains_unit and meta.number_of_units
• Section 2: A Repeater whose default number of items should match meta.number_of_units

Here’s how to achieve this:

Section::make('How your Property Looks like')
    ->schema([
        Select::make('meta.contains_unit')
            ->label('')
            ->options([
                PropertyContainsUnitEnum::SingleRentable->value => 'Single Unit',
                PropertyContainsUnitEnum::MultipleRentable->value => 'Multiple Units',
            ])
            ->required()
            ->reactive()
            ->columns(2)
            ->live(),

        TextInput::make('meta.number_of_units')
            ->label('Number of Units')
            ->numeric()
            ->minValue(2)
            ->required()
            ->default(2)
            ->visible(fn (Get $get) => $get('meta.contains_unit') === PropertyContainsUnitEnum::MultipleRentable->value)
            ->helperText('Minimum two units required for multiple unit property')
            ->live(),
    ]),

Section::make('Units')
    ->schema([
        Repeater::make('units')
            ->label('Unit Details')
            ->schema([
                TextInput::make('name')->label('Unit Name'),
                // add other fields as necessary
            ])
            ->default(function (Get $get) {
                // Get the desired count from the previous section's input
                $numberOfUnits = $get('meta.number_of_units') ?? 2;
                
                // Return an array with $numberOfUnits entries
                return collect(range(1, $numberOfUnits))->map(fn ($i) => [
                    // default values for each repeated item
                    'name' => "Unit $i",
                ])->toArray();
            })
            ->reactive()
            ->live(),
    ]),

Key Points:

• The default callback on the Repeater uses the $get('meta.number_of_units') to determine how many repeatable items to generate.
• reactive() and live() are important for real-time updates in Filament forms.
• This means: when number_of_units changes, the Repeater will re-populate to match that count (note: existing data may be lost on change unless handled with care).

Caveat:
This will only set the default on first render or when the form is reset. If you want to dynamically add/remove repeaters whenever number_of_units is changed (live), you might need more advanced handling—possibly using custom actions or listeners to sync the Repeater’s item count with number_of_units in real time.

If you want to keep previous values:
You'd need to merge old Repeater data with new defaults, but for a basic setup, the above is correct.

Summary:

• Use a closure for the Repeater’s default() value.
• Retrieve the "other" value via $get.
• Make fields reactive for live updates.

Let me know if you need a more advanced sync solution!