I use form model binding with a eloquent relation like customer -> hasOne -> adres. Everything on the form and database updates is working well.

In my request validation I can do something like:

  public function rules() {


    return [
      'adres.firstname' => 'required|min:5',
    ];
  }

This is working well, but I don't like the error message: "The adres.firstname field is required."

I should be able to change the error message in validation.php:

  'custom' => [
    'adres.firstname' => [
      'required' => 'Please enter your first name',
    ],
  ],

But it is not accepting "adres.firstname"? Just a single fieldname will work. Can somebody explain to me how I can change the message?

I tried the attributes in validation.php as well but it has the same problem.

What actually is working is add a messages function:

public function messages() {
  $messages = [];
  $messages['adres.firstname.required'] = 'Please fill in your first name!';
  return $messages;
}

But I build a multi language site, and I don't know how to translate this way.