/** * Retrieve all variations * * @return Mzax_Emarketing_Model_Resource_Campaign_Variation_Collection */ public function getVariations() { if (!$this->_variations) { $this->_variations = Mage::getResourceModel('mzax_emarketing/campaign_variation_collection'); $this->_variations->addCampaignFilter($this); } return $this->_variations; }