Magento Product Page redirection - magento

Question

Which controller in Magento do I need to override if I want to redirect a certain product view page to another url?
I'd like to use the following code for redirection. Is there any more Magento-like way of doing it?
if($this->getProductId() == 10) {
header("Location: /mymodule");
die();
}

Answer 1

Magento Admin has a feature for this under Catalog > URL Rewrite Management. Create a new product rewrite with these steps:
Click the Add URL Rewrite button at top right.
Select “Custom” from Create URL Rewrite.
Choose the appropriate Store.
Set Request Path to something like this catalog/product/view/id/10 (assuming 10 is the ID of your product).
Set Target Path to whatever route or URL you want to send the request to.
Set Redirect to probably “Temporary (302)”.

Answer 2

Found a solution. Might not be the best one but it works:
Observer.php:
class Namespace_Mymodule_Model_Observer {
public function redirect(){
//request object
$request = Mage::app()->getRequest();
//only redirect in the frontend/catalog
$storeId = Mage::app()->getStore()->getId();
if(in_array($request->getModuleName(), array("catalog")) && $storeId != 0) {
$response = Mage::app()->getResponse();
$params = Mage::app()->getRequest()->getParams();
//check the product id
if($params[id] == 10) {
return $response->setRedirect("/mymodule", 301)->sendHeaders();
}
}
}
}
And the config.xml in the global/events section:
<controller_action_predispatch>
<observers>
<namespace_mymodule_observer>
<type>singleton</type>
<class>namespace_mymodule/observer</class>
<method>redirect</method>
</namespace_mymodule_observer>
</observers>
</controller_action_predispatch>

Answer 3

I believe a better approach is to actually utilize the observer event since all you need is included here already. Also, the answer does not differentiate between products and categories since in_array($request->getModuleName(), array("catalog")) would be true for both.
class Namespace_Mymodule_Model_Observer {
public function redirect(Varien_Event_Observer $observer) {
$actionName = $observer->getEvent()->getControllerAction()->getFullActionName();
$productId = $observer->getEvent()->getControllerAction()->getRequest()->getParam('id');
if($actionName == 'catalog_product_view' && $productId == 10) {
$response = $observer->getEvent()->getControllerAction()->getResponse();
$response->setRedirect('/mymodule', 301)->sendHeaders();
}
}
}