CakePHP Show Validation Message on Hidden Field - forms

Question

In my form I've created a hidden field:
echo $this->Form->hidden('editor_rating', array('value' => 0));
Which outputs:
In my model I've created a validation rule:
'editor_rating' => array(
'rule' => array('comparison', 'greater or equal', 1),
'message' => 'Please choose a valid Editor Rating'
)
When I submit the form the hidden field has an error class added, but no visible change and no error message:
<input id="ListingEditorRating" class="form-error" type="hidden" value="0" name="data[Listing][editor_rating]">
How can I make this error message visible or even attach it to a different div?

Answer 1

FormHelper::error
For use cases where Form->input or Form->inputs are not used you can render errors explicitly:
if ($this->Form->isFieldError('gender')) {
echo $this->Form->error('gender');
}

Answer 2

OK, so it doesn't look like there is any built in method to handle what I need which is understandable, so I'm handling it manually by checking the validationErrors for the field.
Here is a cleaner example than the editor_rating field I used perviously:
(artist_picker uses jQuery autocomplete to fetch a list of matching artists. We want to display the artist name in the input, but need to submit the artist_id to the DB, hence updating the hidden field)
echo $this->Form->hidden('artist_id', array('div' => false));
echo $this->Form->input('artist_picker', array(
'label'=> false,
'div'=> (isset($this->validationErrors['Listing']['artist_id']) ? 'span4 error' : 'span4'), // Turn on error class if errors
'class' => (isset($this->validationErrors['Listing']['artist_id']) ? 'span12 form-error' : 'span12'), // Turn on form-error class if errors
'after' => (isset($this->validationErrors['Listing']['artist_id']) ? '<div class="error-message">'.$this->validationErrors['Listing']['artist_id'][0].'</div>' : ''),
'type'=>'text') // Show error message if errors
);