Question

When I need to rewrite a function in an observer located in the Enterprise section, how will that rewrite bit look like on config.xml.

is it something like this?

<global>
    <models>
        <enterprise>
            <rewrite>
                <giftcard>Custom_GiftCard_Model_Observer</giftcard>
            </rewrite>
        </enterprise>
    </models>
</global>

My class is declared as follow:
class Custom_GiftCard_Model_Observer extends Enterprise_GiftCard_Model_Observer {
…..
}

Answer 1

I don’t have an enterprise development environment setup at the moment, so this is untested, but it should work as described.

If you look at the Gift Card configuration in

app/code/core/Enterprise/GiftCard/etc/config.xml

You can grep about and discover the class alias for the gift card observer

<class>enterprise_giftcard/observer</class>

So, with a class alias of enterprise_giftcard/observer you have a model group name of enterprise_giftcard, and a model class name of observer.

In your module’s configuration file, first you’ll create an area for model configuration

<global>
    <models>

    </models>
</global>

Then, you’ll add the group name of the class you want to rewrite, enterprise_giftcard

<global>
    <models>
        <enterprise_giftcard>
        </enterprise_giftcard>
    </models>
</global>

Then, you’ll add a node saying you want to rewrite the a single class in this group

<global>
    <models>
        <enterprise_giftcard>
            <rewrite>
            </rewrite>
        </enterprise_giftcard>
    </models>
</global>

The, you’ll add a node indicating WHICH class in the group you wish to rewrite, using the name portion of the class alias (observer)

<global>
    <models>
        <enterprise_giftcard>
            <rewrite>
                <observer></observer>
            </rewrite>
        </enterprise_giftcard>
    </models>
</global>

And finally, within this node, you’ll add a text node that’s the name of your new class.

<global>
    <models>
        <enterprise_giftcard>
            <rewrite>
                <observer>Custom_GiftCard_Model_Observer</observer>
            </rewrite>
        </enterprise_giftcard>
    </models>
</global>

You can test your rewrite by instantiating the observer directly, and checking its class name

$model = Mage::getModel('enterprise_giftcard/observer');
var_dump(get_class($model));