Magento 1.9 Module – Overriding Custom Module Block

magento-1.9module

I would like to override a specific block of a module that I've downloaded, because there is a specific methods I would like to add, and I don't like the idea of modifying module's core files.

I have hard time to structure my xml correctly, which is why my block does not gets loaded instead of the original one. I've tried following the tips provided by @Joseph in this question, but no luck.

Now, let me provide some file structure.

The interesting part of the downloaded module config.xml

<?xml version="1.0"?>
    <config>
        <modules>
            <EM_Megamenupro>
                <version>1.0.0</version>
            </EM_Megamenupro>
        </modules>
        <blocks>
            <megamenupro>
                <class>EM_Megamenupro_Block</class>
            </megamenupro>
        </blocks>
    </config>

The block I am trying to modify is located in app/local/EM/Megamenupro/Block/Megamenupro.php

Now, my module is located in app/local/Acme/Demo, my block is located in app/local/Acme/Demo/Block/Megamenu.php

My module is active(I checked it up in Administrative panel, its there)

In my config.xml file I've added the following nodes, but it does not appear to be working.

<global>
    <blocks>
        <megamenupro>
            <rewrite>
                <megamenu>Acme_Demo_Block_Megamenu</megamenu>
            </rewrite>
        </megamenupro>
    </blocks>
</global>

Any kind of help would be kindly appreciated. Thank you.

Best Answer

Your config.xml should look like this:

<global>
    <blocks>
        <megamenupro>
            <rewrite>
                <megamenupro>Acme_Demo_Block_Megamenu</megamenupro>
            </rewrite>
        </megamenupro>
    </blocks>
</global>

As a general rule:
The config in the original extension states this:

<blocks>
    <megamenupro>
        <class>EM_Megamenupro_Block</class>
    </megamenupro>
</blocks>

You need to rewrite EM/Megamenupro/Block/Megamenupro.php that is referenced internaly as megamenupro/megamenupro.
Your config should look like this

<global>
    <blocks><!-- you are rewriting a block -->
        <megamenupro><!-- the same tag as in the original extension under the <blocks> tag -->
            <rewrite> <!-- this is fixed -->
                <megamenupro>Acme_Demo_Block_Megamenu</megamenupro><-- this tag should be what's after the `Block/` part in the class you want to rewrite. so  -EM/Megamenupro/Block/Megamenupro.php becomes 'megamenupro'->
            </rewrite>
        </megamenupro>
    </blocks>
</global>

Related Solutions

Magento 1.8 Custom Block Module – How to Create

I find the whole XML thing difficult so I am sympathetic to your cause here.

It looks to me like there is a discrepancy with your class name and your block XML

class Crusader_CLHomePage_Block_Qwerty extends Mage_Core_Block_Template

and

    <block type="core/template" name="homepage" template="crusader/home.phtml">
        <block type="crusaderhome/qwerty" name="homeads" as="homeads" template="crusader/homeads.phtml" />
    </block>

Let's start with the block type and work backward. I think here I would expect to see something like

<block type="crusader_home/qwerty" ...

and that type would refer Magento to the class

Crusader_Home_Block_Qwerty extends Mage_Core_Block_Template

Continuing to work backward on this tack, the file app\code\local\Crusader\CLHomePage\etc\config.xml would need to be modified to something like

<global>
    <blocks>
        <crusader_home>
            <class>Crusader_Home_Block</class>
        </crusader_home>
    </blocks>
</global>

It points Magento to all classes starting 'Crusader_Home_Block_*'. And now I think you need to rename your module Crusader_Home instead of Crusader_CLHomePage and change the folder names accordingly...

AND / BUT I strongly recommend you change your module name. Only ever use one capital letter at the start of the module name not three and don't put capital letters in the middle of the name either.

You may want to look into some of the tools available for generating modules. I find them very useful for avoiding typing errors. I use this one by the very clever people at MGT Commerce (it has simplicity on its side) and this one is all-encompassing and an astonishing piece of coding by Silk Software.

***EDIT following comments below

Additionally based on the error log I think the problem is that Magento can't find your class file. So double-check the caches are refreshed or off, particularly XML cache, and that the compiler is off or re-enabled.

Magento Custom Module – Blocks and config.xml Help

Since you have provided less info about your module I can suggest the following corrections only. Hope it might useful.

1). There are some mis-configurations in your config.xml file. See the below code (corrected one)

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <Site_SiteTest><!--use 'Namespace_Module' -->
            <version>1.0.0</version>
        </Site_Test>
    </modules>  
    <global>
        <blocks>
            <sitetest> <!-- this node can be anything, But as standard use the lowercase name of your module-->
                <class>Site_SiteTest_Block</class><!-- put entire path upto Block folder-->
            </sitetest>
        </blocks>
    </global>
</config>

2). Rename your block class file as Test.php

So the block class declaration should be as follow.

<?php
class Site_SiteTest_Block_Test extends Mage_Core_Block_Template
{
//your code here.
}

3). Make sure you have written the module activation file in app/etc/modules folder. It should be Site_SiteTest.xml with the following content.

<config>
   <modules>
      <Site_SiteTest>
          <active>true</active>
          <codePool>local</codePool>
      </Site_SiteTest>
   </modules>
</config>

4). Make sure the cache is disabled. (go to System > Cache Management and select all, then disabled them)

Best Answer

Related Solutions

Magento 1.8 Custom Block Module – How to Create

Magento Custom Module – Blocks and config.xml Help

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