Show validation message when validation fail

[Mariano C.]

I have Post model in which I've defined validation rules:

var $validate = array(
        'range' => array(
        'rule' => array('range', 1900, 2010),
        'message' => 'Between 1900 and 2010.'
    )
);

and I've the PostsController, with an easy add function:
function add() {
        if (!empty($this->data)) {
                if ($this->Post->save($this->data))
                        {
                           // HANDLE SUCCESS
                        }
                        else
                        {
                           // HANDLE VALIDATION ERROR
                           $this->Session->setFlash("generic error");
                        }
                }
        }

How I've to code the 'else' branch to show validation error message
defined inside model?
Especially I would show "between 1900 and 2010." as error rather thn
"generic error"

Regards

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