#2 added proper handling of collections with eav entities

Author: mryvlin

src/app/code/community/Hackathon/GridControl/Model/Observer.php

@@ -43,10 +43,12 @@ public function eavCollectionAbstractLoadBefore(Varien_Event_Observer $event)
              */
             $config = Mage::getSingleton('hackathon_gridcontrol/config');
 
-            // add attributes to collection
-            //foreach ($config->getCollectionUpdates(Hackathon_GridControl_Model_Config::TYPE_ADD_ATTRIBUTE, $blockId) as $entry) {
-                //$event->getCollection()->addAttributeToSelect($entry);
-            //}
+            // add attributes to eav collection
+            if ($event->getCollection() instanceof Mage_Eav_Model_Entity_Collection_Abstract){
+                foreach ($config->getCollectionUpdates(Hackathon_GridControl_Model_Config::TYPE_ADD_ATTRIBUTE, $blockId) as $entry) {
+                    $event->getCollection()->addAttributeToSelect($entry);
+                }
+            }
 
             // join attributes to collection
             foreach ($config->getCollectionUpdates(Hackathon_GridControl_Model_Config::TYPE_JOIN_ATTRIBUTE, $blockId) as $attribute) {

src/app/code/community/Hackathon/GridControl/etc/config.xml

@@ -35,6 +35,15 @@
                     </hackathon_gridcontrol>
                 </observers>
             </core_collection_abstract_load_before>
+            <eav_collection_abstract_load_before>
+                <observers>
+                    <hackathon_gridcontrol>
+                        <type>singleton</type>
+                        <class>hackathon_gridcontrol/observer</class>
+                        <method>eavCollectionAbstractLoadBefore</method>
+                    </hackathon_gridcontrol>
+                </observers>
+            </eav_collection_abstract_load_before>
         </events>
     </adminhtml>
 </config>