Custom Product Type

[helln]

Hey!

I'm trying to create a custom product type, based on Mage Virtual Products and run into a problem setting up my module's configuration file. Through core debugging i found out, that my product type model class is not present in Mage_Core_Model_Config->_classNameCache->global/models. Not like my helper class, what has the same structure in my config file and is loaded in the core config model class name cache.

/app/etc/modules/Dan_CouponProduct.xml

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

<!-- /**
* Module Initial Configuration
*
* @author: helln
*/ -->

<config>
	<modules>
		<Dan_CouponProduct>
			<active>true</active>
			<codePool>local</codePool>
		</Dan_CouponProduct>
		<depends>
			<Mage_Catalog />
		</depends>
	</modules>
</config>

/app/code/local/Dan/CouponProduct/etc/config.xml

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

<!-- /**
* Module Configuration
*
* @author: helln
*/ -->

<config>
	<modules>
		<Dan_CouponProduct>
			<version>0.0.1</version>
		</Dan_CouponProduct>
	</modules>
	
	<global>
		<catalog>
			<product>
				<type>
					<coupon translate="label" module="dan_couponproduct">
						<label>Coupon Product</label>
						<model>dan_couponproduct/product_type</model>
						<is_qty>1</is_qty>
						<composite>0</composite>
						<can_use_qty_decimals>0</can_use_qty_decimals>
					</coupon>
				</type>
			</product>
		</catalog>
		
		<helpers>
			<dan_couponproduct>
				<class>Dan_CouponProduct_Helper</class>
			</dan_couponproduct>
		</helpers>
		
		<models>
			<dan_couponproduct>
				<class>Dan_CouponProduct_Model</class>
			</dan_couponproduct>
		</models>
	</global>
</config>

/app/code/local/Dan/CouponProduct/Model/Product/Type.php

class Dan_CouponProduct_Model_Product_Type extends Mage_Catalog_Model_Product_Type_Virtual {
	const TYPE_COUPON = 'coupon';
	
	protected function _prepareProduct(Varien_Object $buyRequest, $product, $processMode) {
		$tmp = 0;
		return parent::_prepareProduct($buyRequest, $product, $processMode);
	}
}

/app/code/local/Dan/CouponProduct/Helper/Data.php

<?php /**
* Helper
*
* @author: helln
*/
class Dan_CouponProduct_Helper_Data extends Mage_Catalog_Helper_Data {
}

/app/code/local/Dan/CouponProduct/Model/CouponProduct.php

<?php /**
* Module Model
*
* @author: helln
*/

class Dan_CouponProduct_Model extends Mage_Core_Model_Abstract {
	protected function _construct() {
		$this->_init('dan_couponproduct/couponproduct');
	}
}

error
Fatal error: Call to a member function setConfig() on a non-object in /var/www/html/development/cms/magento/1/app/code/core/Mage/Catalog/Model/Product/Type.php on line 80

Next thing what makes me wonder is, that i had to provide a helper class. Shouldn't my module inherit automatically all unprovided classes, from the module named in the "depends" element, in my initial configuration file?
Did i misunderstood that part?

Help would be very appreciated.

Thanks
Nik

[Theis Corfixen · Accepted solution]

Hi @helln

You are pretty close there. Did you define your modules model shorthand (dan_couponproduct)? If not add the following to your modules config file under the global node:

<models>
    <dan_couponproduct>
        <class>Dan_CouponProduct_Model</class>
    </dan_couponproduct>
</models>

The depends function in M1, doesn't do much other then preventing your store from running the module (or the entire store), when a dependency fails.

I hope this helps :-)

[helln]

Thanks for your reply @Theis Corfixen!

As you suspected correctly i had no model class mentioned in my config.xml
Based on the misunderstandig of the Magento Development Guidelines (v1.0), that all unprovided classes will be inherited from Mage Catalog i made this mistake.
(I will correct and complete my code in the original post, to provide a functional sample of a custom product type)

Thanks again for your assistance!

Kindes Regards
Nik