gistfile1.txt

<?php
class ActiveRecord {
    public static function generateCacheKey($field, $id = null)
    {
        return get_class(static::model()).($id !== null ? ':'.$id : '').':'.$field;
    }
    
    public function getCacheKey($field)
    {
        return self::generateCacheKey($field,$this->getPrimaryKey());
    }
    
    public function invalidateCache($field)
    {
        Yii::app()->cache->delete($this->getCacheKey($field));
    }
}