How do I extend CMS Block on save event of Magento?

magento, magento-1.7

Solution

`Mage_Cms_Model_Block` does not override the `_eventPrefix` property, so it therefore will only trigger two generic events before saving: `model_save_before` and `core_abstract_save_before`.

Whereas 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 observer to work. However, because you are already performing a rewrite and using your model as an observer, you could simply override the `_beforeSave()` method and add your logic in there and simply things a bit.

Edit: Your rewrite isn't working. Rewrite syntax for `cms/block` model is

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

Problem

I have this XML structure in my Alchemy Catalog 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 that should log a message to prove 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 never gets called. Note: The other methods for product and catalog work just fine. Any help fixing this or any other method will be appreciated

Original source