public function collectionsAction()
 {
     $thing_1 = new Varien_Object();
     $thing_1->setName('david');
     $thing_1->setAge('27');
     $thing_1->setLastName('Smith');
     $thing_2 = new Varien_Object();
     $thing_2->setName('Jane');
     $thing_2->setAge(12);
     $thing_3 = new Varien_Object();
     $thing_3->setName('Spot');
     $thing_3->setLastName('The Dog');
     $thing_3->setAge(7);
     //var_dump($thing_3->getData());
     //var_dump($thing_3["last_name"]);
     /*Definiremos ahora una serie de collections*/
     $collection_of_things = new Varien_Data_Collection();
     $collection_of_things->addItem($thing_1)->addItem($thing_2)->addItem($thing_3);
     foreach ($collection_of_things as $thing) {
         var_dump($thing->getData());
     }
     echo "<br><br>";
     echo "obteniendo el primer y Ășltimo elemento";
     echo "<br><br>";
     var_dump($collection_of_things->getFirstItem());
     var_dump($collection_of_things->getLastItem()->getData());
     echo "<br><br>";
     echo "Ahora como xml";
     var_dump($collection_of_things->toXml());
     echo '<br><br>';
     echo 'ahora obtenemos solo las columnas identificadas como name';
     echo '<br><br>';
     var_dump($collection_of_things->getColumnValues('name'));
     echo '<br><br>';
     echo 'El equipo de Magento nos permite realizar filtrados, ejemplo para el nombre david';
     echo '<br/><br>';
     var_dump($collection_of_things->getItemsByColumnValue('name', 'Spot'));
 }
 /**
  * Get the last item in the collection. As the inherited behavior of creating
  * a new empty item when the collection is empty cannot be achieved here,
  * (@see self::getNewEmptyItem) this method will throw an exception if called
  * on an empty collection.
  * @return EbayEnterprise_Catalog_Model_Pim_Product
  * @throws EbayEnterprise_Catalog_Model_Pim_Product_Collection_Exception If collection is empty
  */
 public function getLastItem()
 {
     if (empty($this->_items)) {
         throw new EbayEnterprise_Catalog_Model_Pim_Product_Collection_Exception(sprintf('%s cannot get item from an empty collection', __METHOD__));
     }
     return parent::getLastItem();
 }