How to get event observer data after save category?

Question

I want to export data of a category when its save in magento system. So, I also create a module & create a event name which is catalog_category_save_commit_after. My code is like below..

<config>
<global>
 ....
<events>
        <catalog_category_save_commit_after>
            <observers>
                <category_category_observer>
                    <type>singleton</type>
                    <class>Feed_Category_Model_Category_Observer</class>
                    <method>saveCategoryData</method>
                </category_category_observer>
            </observers>
        </catalog_category_save_commit_after>
    </events>
</global>

class Feed_Category_Model_Category_Observer
{
    public function saveCategoryData($observer)
    {              

        $category = $observer->getEvent()->getDataObject();
        Mage::log($category);
        // or
        Mage::log($observer->getEvent()->getCategory());    

    }
 }

Both are return blank. Have any idea??

Answer 1

I have used this in sales_order_place_after event

public function myMethod(Varien_Event_Observer $observer)
    {
        $data = $observer->getEvent()->getOrder();
        Mage::log($data , null, 'sales_order_place_data.log');   
}

Maybe it will be helps you.

You can try this

$data = $observer->getEvent()->getCategory();
Mage::log($data , null, 'sales_order_place_data.log');

Answer 2

To see what kind of data is available the fastest way is to check where the dispachtEvent is called. This cheatsheet should help you with that.

If you open the class on line 334 you can see what data is passed. Looking at the code it should be something like this:

var_dump($observer->getDataObject()->getData());