Custom error message

[Francesco-1277]

hi,

I want to implement a custom error message, my question is very similar to this #145 except for the fact that I need an additional layer of validation even when the normal validation rules are respected.

At the moment I solved in this way

`$form->saved(function () use ($form) {
    $get_record = DB::table('my_table')->where('fk_key_1', $form->model->fk_key_1)->
    where('fk_key_2', $form->model->fk_key_2)->where('type', $form->model->type)->first();

    if ($get_record->id) {
      $form->message("There is another record with the same properties, so the record was not saved.");
      $cancella = DB::table('my_table')->where('id', $form->model->id)->delete();
      $form->link("/my_controller/edit?modify=" . $get_record->id, "Edit the existing record");
    } else {
      $form->message("Record saved");
      $form->link("/my_controller/edit?modify=" . $form->model->id,"Edit the record");
    }
  });`

but it's not so elegant, nor efficient, to delete a record after the insertion. Do you have any suggestions?