Rewrite Credit Memo API in Magento CE 1.9

Question

I am trying to rewrite the model sales_order_credit_memo_api with my own "info" function. I have created all the files yet when I access the API call "order_creditmemo.info" it uses the base Mage model, instead of using the class defined in my rewrite.

I have successfully rewritten other models, but I cannot get this one to work. Does anyone know what I'm doing wrong?

With all the coding shown below in place if I use the magerun.phar tool and run this command magerun.phar dev:class:lookup model sales/order_creditmemo_api it results in Model sales/order_creditmemo_api resolves to Kane_MultiDiscountAPI_Model_Order_Creditmemo_Api which should mean everything is working.

The file that contains the class I'm trying to rewrite is: app/code/Mage/Sales/Model/Order/Creditmemo/Api.php

FILES IN MY EXTENSION:

app/etc/modules/Kane_MultiDiscountAPI.xml

<?xml version="1.0" encoding="UTF-8"?>
 <config>
    <modules>
        <Kane_MultiDiscountAPI>
            <active>true</active>
            <codePool>local</codePool>
            <depends>
                <Mage_Sales />
            </depends>
        </Kane_MultiDiscountAPI>
    </modules>
</config>

app/code/local/Kane/MultiDiscountAPI/etc/config.xml

<?xml version="1.0"?>
<config>
    <modules>
        <Kane_MultiDiscountAPI>
            <version>0.1.0</version>
        </Kane_MultiDiscountAPI>
    </modules>
    <global>
        <models>
            <sales>
                <rewrite>
                    <order_api>Kane_MultiDiscountAPI_Model_Order_Api</order_api>
                    <order_creditmemo_api>Kane_MultiDiscountAPI_Model_Order_Creditmemo_Api</order_creditmemo_api>
                </rewrite>
            </sales>
        </models>
    </global>
</config>

app/code/local/Kane/MultiDiscountAPI/Model/Order/Creditmemo/Api.php

class Kane_MultiDiscountAPI_Model_Order_Creditmemo_Api extends Mage_Sales_Model_Order_Creditmemo_Api
{
    public function info($creditmemoIncrementId)
    {
        $result = parent::info($creditmemoIncrementId);
        // Extended logic
        return $result;
    }
}

Answer 1

I think your config.xml is totally fine.last override for credit memos is wrong,but first two rewrite is correct.Need to check the model class code.

my skye is kinex.sourav. & am magento developer. join me at skype

Answer 2

The only way I can reproduce this is by having something wrong with your module registration file (app/etc/modules/Kane_MultiShippingAPI.xml).

Considering the following:

# File: app/etc/modules/Kane_MultiShippingAPI.xml
<?xml version="1.0"?>
<config>
    <modules>
        <Kane_MultiDiscountAPI>
            <active>true</active>
            <codePool>local</codePool>
        </Kane_MultiDiscountAPI>
    </modules>
</config>

If I use that with the rest of the code you've provided and test the class lookup with Magerun, I get your model:

$ magerun.phar dev:class:lookup model sales/order_api
Model sales/order_api resolves to Kane_MultiDiscountAPI_Model_Order_Api

However, if you use codepool instead of codePool, or anything else is broken in your module then it will resolve back to Mage_Sales_Model_Order_Api.

As KESHAV_SOURAV has already mentioned, this line of your config.xml is not necessary (presume its a hangover from testing) - there is no Mage_Sales_Sales class path:

<sales_order_creditmemo_api>Kane_MultiDiscountAPI_Model_Order_Creditmemo_Api</sales_order_creditmemo_api>

Also - it must be said: make sure you've cleared your cache (or disabled it while testing).