Magento 1.7 – Fix Fatal Error: Class ‘Mage_Rms_Helper_Data’ Not Found

helpermagento-1.7module

I realize there are questions just like this one, but none of the answers apply to me so far.

I am building a custom module that works, except the helper class won't load. I'm calling it with Mage::helper('rms') and I get

Fatal error: Class 'NewHope_Rms_Helper_Data' not found in C:\wamp\www\app\Mage.php on line 546

Here's my module config. The observer correctly get triggered after a user successfully registers:

app/code/local/NewHope/RmsUpdate/etc/config.xml

<?xml version="1.0" encoding="UTF-8"?>

<config>
    <modules>
        <NewHope_RmsUpdate>
            <version>0.0.1</version>
        </NewHope_RmsUpdate>
    </modules>
    <global>
        <events>
            <customer_register_success>
                <observers>
                    <newhope_rmsupdate>
                        <class>newhope_rmsupdate/observer</class>
                        <method>import_new_customer_to_rms</method>
                        <type>singleton</type>
                    </newhope_rmsupdate>
                </observers>
            </customer_register_success>
        </events>
        <models>
            <newhope_rmsupdate>
                <class>NewHope_RmsUpdate_Model</class>
            </newhope_rmsupdate>
        </models>
        <helpers>
            <rms>
                <class>NewHope_Rms_Helper</class>
            </rms>
        </helpers>
    </global>
</config>

app/code/local/NewHope/RmsUpdate/Helper/Data.php

<?php

class NewHope_Rms_Helper_Data extends Mage_Core_Helper_Abstract
{
    ...
}

app/code/local/NewHope/RmsUpdate/Model/Observer.php

<?php

class NewHope_RmsUpdate_Model_Observer
{
    public function import_new_customer_to_rms(Varien_Event_Observer $observer)
    {
        $customer = $observer->getCustomer();

        //Fatal Error shows up here, when I try to load the rms helper!
        $rms_updated = !!Mage::helper('rms')->CreateRmsUser($customer);

        Mage::log(
            sprintf('%s (%s) registered. RMS Update: %s',
                $customer->getEmail(),
                $customer->getId(),
                $rms_updated ? 'Successful' : 'Failed'),
            null,
            'user-registration.log');
    }
}

I have these clues:

  1. I experimented with changing the config.xml <rms> tag to something arbitrary that I knew was wrong, and the error still remained identical.
  2. In between every attempt I manually deleted the var/cache folder, so even though the above points seem like a caching issue, I think they are not.
  3. Compilation is disabled already, that's not the issue.

Best Answer

You configured your helper class like this.

<helpers>
    <rms>
        <class>NewHope_Rms_Helper</class>
    </rms>
</helpers>

So when you request you helper class with Mage::helper('rms'), Magento will trace your module, since it defines the helper alias name rms and then pick class name associate with it. So in this case, Magento has NewHope_Rms_Helper. The next step magento checks, whether you requested in particular helper class name. For example, if you were requested a helper class like Mage::helper(rms/example), then magento will append this example part to the class that already picked from your configuration and thus completes the class generation process(Here the class would be NewHope_Rms_Helper_Example). However if we didn't specify any specific helper name, then by default, Magento assumes this class name as Data. So in your case, Magento forms final helper class as NewHope_Rms_Helper_Data.

The name of the class is an indication to the location where that class should be defined. That means Magento will now look for your helper in app/code/local/NewHope/Rms/Helper/Data.php. If it is not present there, it will look in app/code/community/NewHope/Rms/Helper/Data.php. Then again in app/code/core directory and then again in lib directory. In your case, Magento can't find the helper class. So as a result it will throw an error.(Note location generated is NewHope\Rms and not NewHope\RmsUpdate).

So the configuration that you need here is 

<helpers>
    <rms>
        <class>NewHope_RmsUpdate_Helper</class>
    </rms>
</helpers>

So this will generate a class NewHope_RmsUpdate_Helper_Data and thus first it will look in the location app/code/local/NewHope/RmsUpdate/Helper/Data.php. The file content should look like this.

<?php
class NewHope_RmsUpdate_Helper_Data extends Mage_Core_Helper_Abstract
{
}

Hope that will give you an idea on what is really happens in the backside

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