How to extend a CMS block to save a Magento event?

Question

I have this XML structure in my Alchemy directory module:

<?xml version="1.0" encoding="UTF-8"?> <!-- @filepath /app/code/local/Alchemy/Catalog/etc The XML has been extended following Magento Events API Observers http://www.excellencemagentoblog.com/magento-part11-series-eventsapi or http://blog.chapagain.com.np/magento-event-observer-with-save-before-and-save-after/ --> <config> <modules> <Alchemy_Catalog> <version>0.1.0</version> </Alchemy_Catalog> </modules> <global> <models> <alchemycatalog> <rewrite> <product>Alchemy_Catalog_Model_Product</product> <block>Alchemy_Catalog_Model_Block</block> </rewrite> </alchemycatalog> </models> <events> <!-- Examples: catalog_product_save_before, catalog_product_prepare_save Check out Magento events cheat sheet at http://www.nicksays.co.uk/magento-events-cheat-sheet-1-7/ --> <catalog_product_save_after> <observers> <Alchemy_Catalog> <type>singleton</type> <class>Alchemy_Catalog_Model_Product</class> <method>pingBaseProductService</method> </Alchemy_Catalog> </observers> </catalog_product_save_after> <catalog_category_save_after> <observers> <Alchemy_Catalog> <type>singleton</type> <class>Alchemy_Catalog_Model_Product</class> <method>pingBaseCategoryService</method> </Alchemy_Catalog> </observers> </catalog_category_save_after> <cms_block_save_before> <observers> <Alchemy_Catalog> <type>singleton</type> <class>Alchemy_Catalog_Model_Block</class> <method>rabbitmqBlockProducer</method> </Alchemy_Catalog> </observers> </cms_block_save_before> </events> </global> </config> 

and this model, which must register a message in order to prove that it works:

 <?php class Alchemy_Catalog_Model_Block extends Mage_Cms_Model_Block { /** * Implement function rabbitmqBlockProducer(). * This function writes a message to the rabbit * mq server */ protected $_eventPrefix = 'cms_block'; public function rabbitmqBlockProducer ($event) { Mage::log('save3 block invoked', null, 'marian.log'); } /** * Prevent blocks recursion * * @throws Mage_Core_Exception * @return Mage_Core_Model_Abstract */ protected function _beforeSave() { Mage::log('save2 block invoked', null, 'marian.log'); } } 

But the rabbitmqBlockProducer () method is never called. Note. Other methods for the product and catalog work very well.

Any help fixing this or any other method would be appreciated.

Answer 1

Mage_Cms_Model_Block does not override the _eventPrefix property, so it should only trigger two common events before saving: model_save_before and core_abstract_save_before .

If you are already rewriting the CMS block model, you can simply override the _eventPrefix property and set it to cms_block ; this will allow your supervisor to work. However, since you are already doing rewriting and using your model as an observer, you can simply override the _beforeSave() method and add your logic and a bit of stuff there.

Change Your rewriting file does not work. Rewrite syntax for cms/block model

 <global> <models> <cms> <rewrite> <block>Alchemy_Catalog_Model_Block</block> </rewrite> </cms> </models> </global>