gistfile1.php

class Article extends ArticlesAppModel {

    var $belongsTo = array(
        'ArticlesCategory' => array(
            'className' => 'Articles.ArticlesCategory',
            'foreignKey' => 'articles_category_id'
        )
        , 'User');
    var $hasOne = array('Avatar' => array('className' => 'Image', 'foreignKey' => 'model_id', 'conditions' => array('Avatar.type' => 'hasOne', 'Avatar.model' => 'Article')));
}

class CommentableBehavior extends ModelBehavior {
  public function setup(&$model, $settings = array()) {
            if (!isset($this->settings[$model->alias])) {
                  $this->settings[$model->alias] = $this->defaults;
            }
            $this->settings[$model->alias] = am($this->settings[$model->alias], ife(is_array($settings), $settings, array()));

            $cfg = $this->settings[$model->alias];
            $model->bindModel(array('hasMany' => array(
                    'Comment' => array(
                        'className' => 'Comment',
                        'foreignKey' => 'foreign_key',
                        'unique' => true,
                        'conditions' => '',
                        'fields' => '',
                        'dependent' => true,
                        'order' => '',
                        'limit' => '',
                        'offset' => '',
                        'exclusive' => '',
                        'finderQuery' => '',
                        'counterQuery' => ''))), false);
            $model->Comment->bindModel(array('belongsTo' => array(
                    $model->name => array(
                        'className' => $model->name,
                        'foreignKey' => 'foreign_key',
                        'unique' => true,
                        'conditions' => '',
                        'fields' => '',
                        'counterCache' => true,
                        'dependent' => false))), false);
            $model->Comment->bindModel(array('belongsTo' => array(
                    $cfg['userModelAlias'] => array(
                        'className' => 'User',
                        'foreignKey' => 'user_id',
                        'conditions' => '',
                        'fields' => '',
                        'counterCache' => true,
                        'order' => ''))), false);
      }
}