First parameter must either be an object or the name of an existing class Magento api soap

Yesterday when i was working in Magento API V2, i met with an issue.

I was able to create product using WSDL xml in Magento. However, i was struggling to insert the additional custom attributes i have created in Magento. Whatever i do, the custom attribute values were not inserting in the fields for product.

Creating xml looks like this:

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
    <s:Header>
        <Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none" /> </s:Header>
    <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
        <catalogProductCreateRequestParam xmlns="urn:Magento">
            <sessionId xmlns="">**************</sessionId>
            <type xmlns="">simple</type>
            <set xmlns="">***</set>
            <sku xmlns="">**********</sku>
            <productData xmlns="">
                <websites>
                    <complexObjectArray>1</complexObjectArray>
                </websites>
                <name>Test</name>
                <description>Test</description>
                <short_description>Test</short_description>
                <weight>0.00</weight>
                <status>2</status>
                <price>0.0000</price>
                <tax_class_id>2</tax_class_id>
                <meta_description>Test</meta_description>
                <additional_attributes>
                    <complexObjectArray>
                        <key>colour</key>
                        <value>red</value>
                    </complexObjectArray>                   
                </additional_attributes>
            </productData>
        </catalogProductCreateRequestParam>
    </s:Body>
</s:Envelope>


Here whatever i do, colour was not setting for that product.

So i started debugging the code and found this error:

"First parameter must either be an object or the name of an existing class /app/code/core/Mage/Catalog/Model/Product/Api/V2.php"

Then i started investigating the above V2.php file. I understood that in this method: _prepareDataForSave, the additional attributes are getting inserted/updated.

Under if (property_exists($productData, 'additional_attributes')) { , it checks for single_data and multi_data. I have amended another if condition just below the other two if conditions.

if (gettype($productData->additional_attributes) == 'array') {
                foreach ($productData->additional_attributes as $k => $v) {
                    $_attrCode = $k;
                    $productData->$_attrCode = $v;
                }
            }

This checks whether the type receiving is in array. So the whole code will looks like this:

 And Voila, everything started importing. For dropdown attributes, i used index instead of values. For text and other attribute types, used values itself.

Just try it out and not worked, get me back via contact form.