overriding price model in magento

Question

I am facing problem in overriding product-> type -> price.php model in Magento.

Here is my app/etc/config.xml

<?xml version="1.0"?>
<config>
  <modules>
    <softweb_catalog>
        <active>true</active>
        <codepool>local</codepool>
    </softweb_catalog>
  </modules>
</config>

Here is

app/code/local/Softweb/Catalog/etc/config.xml

<?xml version="1.0"?>
<config>
<modules>
    <softweb_catalog>
        <version>0.1</version>
    </softweb_catalog>
</modules>
<global>
    <models>
        <catalog>
            <class>Softweb_Catalog_Model</class>
        </catalog>
        <catalog>
            <rewrite>
                <product_type_price>Softweb_Catalog_Model_Product_Type_Price</product_type_price>
            </rewrite>
        </catalog>
    </models>
</global>
</config>

Now Price.php path is app/code/local/Softweb/Catalog/Model/Product/Type/Price.php

 class Softweb_Catalog_Model_Product_Type_Price extends Mage_Catalog_Model_Product_Type_Price
 {

   public function getPrice($product)
   {
      die('function called');
   }

  }

I don't know what I am missing....

PS I am using magento 1.9.0.1

Answer 1

The problem resides here

<models>
     <catalog>
          <class>Softweb_Catalog_Model</class>
     </catalog>
....
</models>

Here you are defining your model. catalog is the reference that you are providing for your module's model. Suppose you have a file Foo.php inside your module's model directory. That is

Softweb
|
 ----------Catalog
           |
            ----------- etc
           |             |
           |              ---------- config.xml
           |
            ----------- Model
                        |
                         ----------- Foo.php

And suppose your Foo.php holds a method Foo() method.

<?php
class Softweb_Catalog_Model_Foo extends Mage_Core_Model_Abstract
{
      public function Foo()
      {
           //some foo codes here
           //returns something
      }
}

How can you get this Foo() method that is defined inside your model? According to your model definition it should look like this

 $foo = Mage::getModel('catalog/foo')->Foo();

However your model reference should be unique. So you cannot use catalog for your model reference. Since it is already using in Mage_Catalog core module. See this

Location:app/code/core/Mage/Catalog/etc/config.xml
<global>
        <models>
            <catalog>
                <class>Mage_Catalog_Model</class>
                <resourceModel>catalog_resource</resourceModel>
            </catalog>
            ---------
        </models>
        --------
</global>

So if you need to use your model, you should have a unique reference for your model. That is

    <models>
        <softweb_catalog>
            <class>Softweb_Catalog_Model</class>
        </softweb_catalog>
        <catalog>
            <rewrite>
                <product_type_price>Softweb_Catalog_Model_Product_Type_Price</product_type_price>
            </rewrite>
        </catalog>
    </models>

Here your module is referenced using softweb_catalog and is unique. So now you can access Foo()method as like this.

  Mage::getModel('softweb_catalog/foo')->Foo();

Also it rewrites your required Model file. But since your module does not hold any model files, there is no need for this code. You only need this.

<global>
     <models>
       <catalog>
          <rewrite>
             <product_type_price>Softweb_ConstPrice_Model_Price</product_type_price>
          </rewrite>
       </catalog>
     </models>
  </global>

It will allow you to rewrite Mage_Catalog_Model_Product_Type_Price class. Hope that will help you to understand the fault in your code.