Format Nova field input before validation

Should you be creating your slug by hand in first place? Let the model handle it for you while you create/update it.

I have a description attribute that could be used as a slug and the rest are Translatable stuff. I don't want Admins to have to input that in a slug format, so I AM using a mutator to setDescriptionAttribute() in slug format in the database.

The issue is that validation of the Nova Field beforehand isn't recognizing this mutator to check for a unique rule and stop duplicating records from reaching the database.

Is there any way to format the Nova Text Field input to be used for validation?

I had to abandon the Field's validation with ->rules() and use ->fillUsing() method as follows:

->fillUsing(function ($request, $model, $attribute, $requestAttribute) {
    if ($request->exists($requestAttribute)) {
        // apply the slug format
        $value = Str::slug($request[$requestAttribute]);
        $request[$requestAttribute] = $value;

        if ($request->method() === 'POST') {
            // validate a new record (POST)
            $request->validate([
                $requestAttribute => 'required_if:is_article,1|unique:newsfeeds,slug',
            ]);
        } elseif ($request->method() === 'PUT') {
            // validate an updated record (PUT)
            $request->validate([
                $requestAttribute => 'required_if:is_article,1|unique:newsfeeds,slug,'.$model->id,
            ]);
        }

        // upon a validation pass
        $model->{$attribute} = $value;
    }
})