====== How to Validate  ======

**The Controller file at app/controllers/post_controller.php**

<code php>
class PostController extends ApplicationController {

  function create(){
    $this->Post =& new Post($this->params["post"]);
    if($this->Post->save()){
      $this->redirectToAction("show", array('id' => $Post->getId()));
    }else{
      $this->Post->errors = $this->Post->getErrors();
    }
  }

  //...
  function show(){
  }

}
</code>

** The View file at app/views/post/show.tpl **

<code html>
{?Post.errors}
  The post couldn't be saved due to these errors:
  <ul>
  {loop Post.errors}
    <li>{error}</li>
  {end}
  </ul>
{end}

<%= form "post" %>
</code>

or even shorter:

<code ruby>
<%= error_messages_for 'post' %>
</code>

** The Model file at app/models/post.php **

<code php>
class Post extends ActiveRecord
{
    function validate(){
      $this->validatesPresenceOf( array('title', 'body'), "Missing required field");
      $this->get('title') > 10 ? $this->addError("title", "must be at most 10 characters") : null;
    }
}
</code>


===== More information =====

  * [[understanding-validations|Understanding Validations]]
  * [[http://api.akelos.org/ActiveRecord/Base/AkActiveRecord.html#methodvalidate|Validation API Documentation]] has all sorts of details about what methods are available.


Note: When using validatesConfirmationOf() make sure you also use validatesPresenceOf() if you want to make sure the field exists.