Filament•10mo ago

How to set default state of a field conditionally on Edit page

In my filament resource, when i try to edit a specific model, all fields r filled automatically, okay. but id like to also fill a field which is used only for presentational purposes. how can i do it? this is the field id like to fill:

Forms\Components\Toggle::make('has_users')
    ->live()
    ->dehydrated(false)

Forms\Components\Toggle::make('has_users')
    ->live()
    ->dehydrated(false)

i tried things like these, but idk how to make it work, the field's value always remains false:

->default(function (string $operation, Payment $record): bool {
    if ($operation === 'create') {
        return true;
    }

    return $record->users()->count() > 0;
})

->default(function (string $operation, Payment $record): bool {
    if ($operation === 'create') {
        return true;
    }

    return $record->users()->count() > 0;
})

default only works on Create Pages - https://filamentphp.com/docs/3.x/forms/fields/getting-started#setting-a-default-value so how to make it work in Edit Pages? any alternatives?

4 Replies

MohamedSabil83•10mo ago

There's many options to do that using: - Make an attribute in your model to return that value. - Use ->formatStateUsing() method. - Override the getEloquentQuery() method to chain ->withCount('users). In this case, you'll use it in the form like ('users_count').

ericmpOP•10mo ago

i did the 2nd one, thanks! it works but lets say when i want to submit the form, if has_users is false, i want to remove the relationships that the model has with users. how that can be achieved? with normal fields would be afterStateUpdated - https://filamentphp.com/docs/3.x/forms/advanced#field-updates but for relationships, would also do the trick, i dont think - but im gonna test it now

MohamedSabil83•10mo ago

You can't use ->afterStateUpdated() here, because if remove the relation when toggling it will applied even you didn't submit the form. If has_users was a real field in your DB, you can use life-cycle hook method afterSave() in the EditModel page. In that method, you can check $this->record->has_users and act according to the value.

ericmpOP•10mo ago

having a field used only for presentational purposes is kinda tricky i guess ill move that field to the db too then

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How to set default state of a field conditionally on Edit page