Error Select Multiple (Array to String Conversion)

[fahmiSD]

Package

Form builder

Package Version

v3.2.52

How can we help you?

Hello, I'm new to Filament, and I'm trying to use a Select form with the multiple option.

The column in my database is already of type JSON, and here's the form field I'm using:

Forms\Components\Select::make('penempatan')
    ->multiple()
    ->options([
        'highlight' => 'Highlight',
        'pop-up' => 'Pop-up',
    ]);

In my model, I’ve also cast the penempatan attribute as an array:

protected $casts = [
    'penempatan' => 'array',
];

Despite this setup, I still get the following error when trying to create a new record:

However, when I try to edit an existing record, everything works perfectly.

[leandrocfe]

Weird. It seems like the cast is being ignored. You could use hooks to verify if the values ($this->data) are correct before saving.

[fahmiSD]

thanks, i'll try debugging with the hook.

[fahmiSD]

After some experimentation, I found a solution that worked for me. Instead of relying on $casts to handle the penempatan attribute as an array, I manually added an accessor and mutator in my model:

public function setPenempatanAttribute($value)
{
    $this->attributes['penempatan'] = json_encode($value);
}

public function getPenempatanAttribute($value)
{
    return json_decode($value, true);
}

I also removed the $casts entry for penempatan. This way, the attribute is properly stored as JSON in the database and retrieved as an array in the application.

This approach gives me more control over the serialization process, especially when $casts doesn’t work as expected. Just make sure to validate the data format before saving to avoid encoding/decoding issues.