fix backend import functionality

Because ApiImport prevents rewrites, we don't force an entity model
across the system. This is fine when doing manual programmatic imports
but the Mage_ImportExport admin controller does its own setup of these
models.

Since the bundle module requires access to a protected property and
the Mage_ImportExport_Model_Entity_Product class doesn't expose it
publicly, we have to fetch it using reflection instead.

Closes #30.

code/Model/Import/Entity/Product/Type/Bundle.php

@@ -96,6 +96,21 @@ public function _initAttributes()
         return $this;
     }
 
+    /**
+     * Use reflection to get stores because by default it is protected.
+     * We do this to prevent a rewrite on the ImportExport controller which forces
+     * a specific entity model.
+     *
+     * @return array
+     */
+    protected function _getStores()
+    {
+        $obj  = new ReflectionObject($this->_entityModel);
+        $prop = $obj->getProperty('_storeCodeToId');
+        $prop->setAccessible(true);
+        return $prop->getValue($this->_entityModel);
+    }
+
     /**
      * Saves data specific to bundle products.
      *
@@ -110,7 +125,7 @@ public function saveData()
         $connection       = $this->_entityModel->getConnection();
         $newSku           = $this->_entityModel->getNewSku();
         $oldSku           = $this->_entityModel->getOldSku();
-        $stores           = $this->_entityModel->getStores();
+        $stores           = $this->_getStores();
         $optionTable      = Mage::getSingleton('core/resource')->getTableName('bundle/option');
         $optionValueTable = Mage::getSingleton('core/resource')->getTableName('bundle/option_value');
         $selectionTable   = Mage::getSingleton('core/resource')->getTableName('bundle/selection');