How to override a camelCased model file in Magento?

Question

I have a shipping community model that has a camel cased class/file witch I would like to override.

The original file/class is located under app/code/community/PedroTeixeira/Correios/Model/Carrier/CorreiosMethod.php and I would like to override a method of this file, or the whole class under app/code/local/Esmart/CorreiosImprovements/Model/Carrier/CorreiosMethod.php.

In the original module config file, I can see it's model declaration in config.xml as follows:

<global>
...
    <models> 
        <pedroteixeira_correios>
            <class>PedroTeixeira_Correios_Model</class>
        </pedroteixeira_correios>
    </models>
...
    <sales>
        <shipping>
            <carriers>
                <pedroteixeira_correios>
                    <class>PedroTeixeira_Correios_Model_Carrier_CorreiosMethod</class>
                </pedroteixeira_correios>
            </carriers>
        </shipping>
    </sales>
</global>

At my module config.xml I've declared the override this way:

<global>
    <models>
        <esmart_correiosimprovements>
            <class>Esmart_CorreiosImprovements_Model</class>
        </esmart_correiosimprovements>

        <pedroteixeira_correios>
            <rewrite>
                <carrier_correiosMethod>Esmart_CorreiosImprovements_Model_Carrier_CorreiosMethod</carrier_correiosMethod>
            </rewrite>
        </pedroteixeira_correios>
    </models>
</global>

Usually the model file isn't camel cased, so I guess it's easier. Or am I missing something here?

Any help is appreciated.

benmarks benmarks · Accepted Answer · 2013-07-11T16:25:18

The class group (<pedroteixeira_correios>) to use in your rewrite syntax depends on the class group declaration in the module's config.

The class ID (<carrier_correiosMethod>) to use in your rewrite syntax depends entirely on how the class is invoked in the code. For your example, the following would all instantiate the original class instance on case-sensitive filesystems:

pedroteixeira_correios/carrier_correiosMethod
pedroteixeira_correios/Carrier_correiosMethod
pedroteixeira_correios/carrier_CorreiosMethod
pedroteixeira_correios/Carrier_CorreiosMethod

On case-insensitive filesystems, any combination of casing for the class ID part would yield the model instance. Hopefully the extension vendor followed a consistent pattern when specifying their class in code/markup, but you can specify multiple xpaths using the list above to handle all permutations.

How to override a camelCased model file in Magento?

1 Answers