Laravel 10 Livewire 3 - "validation" attribute doesn't work

Question

I want to use the "#[Validate]" attribute to validate a form post. When I run it I receive the error:

  Missing [$rules/rules()] property/method on Livewire component: [contactform].

...seems to be ignoring the validation attribute entirely:

namespace App\Livewire;

use Livewire\Component;
use Livewire\Attributes\Validate;

class Kontaktform extends Component
{

    #[Validate('required',message: 'Please provide your name')]
    #[Validate('max:255')]
    public $name = '';

.
.
.
   
   //Validate and submit
    public function submitForm(){
    $validated = $this->validate();  <-----error points to this line :S
    dd($validated);

   }
.
.
.

Answer 1

Replace:

   #[Validate('required',message: 'Please provide your name')]
    #[Validate('max:255')]
    public $name = '';

With:

#[Validate]
public $name = '';

And add the following 2 methods in your livewire component:

      public function rules()
      {
        'name' => 'required|max:255'
      }

  public function messages()
  {
    return [
      'name.required' => 'Please provide your name',
      'name.max:255' => 'Name cannot exceed 255 characters'
    ];
  }