Kdjykuj

I have created a custom column for associated products (basically every simple product will have that column under "associated products" tab of configurable product). I store information of this field/column into an attribute which belong to configurable product instead of each simple product.

Below is the code for adding a column;

config.xml

<core_block_abstract_to_html_before>

     <observers>

        <something>

          <class>namespace_JsonProductInfo_Model_Observer</class>

          <method>addPositionColumn</method>

        </something>

     </observers>

</core_block_abstract_to_html_before>

Oberver.php

public function addPositionColumn(Varien_Event_Observer $observer)

{

    $block = $observer->getEvent()->getBlock();

    if ($block instanceof Mage_Adminhtml_Block_Catalog_Product_Edit_Tab_Super_Config_Grid) {

        if (!$block->isReadonly()) {

            $block->addColumnAfter(

                'position_simple',

                array(

                    'header'     => Mage::helper('jsonproductinfo')->__('Position'),

                    'type'      => 'input',

                    'name'      => 'position_simple',

                    'index'     => 'position_simple',

                    'sortable'  => false,

                ),

                'name'

            );

        }

    }

}

With above code I am able to add the column into a require grid. And I am also able to save the information which I put inside that column (which is basically an attribute). The only problem I am facing is, I am unable to display the stored information into that column again (If I edit the product). I have also created another observer of type eav_collection_abstract_load_befor but no luck so far.
Below is the code for it:

config.xml

<eav_collection_abstract_load_before>

    <observers>

        <jsonproductinfo>

            <class>namespace_JsonProductInfo_Model_Observer</class>

            <method>addPositionToCatalogProductCollection</method>

        </jsonproductinfo>

    </observers>

</eav_collection_abstract_load_before>

Observer.php

public function addPositionToCatalogProductCollection($observer)

{

    $collection = $observer->getEvent()->getCollection();

    if (!isset($collection)) {

        return;

    }

    $collection->addAttributeToSelect('position_simple');

}

I would be grateful if someone can point to the mistake or guide me how can I display back that information again into that column.

EDIT

And here is the code which creates the "postion_simple".

$this->addAttribute(

    'catalog_product',

    'position_simple',

    array(

        'group'             => 'General',

        'type'              => 'varchar',

        'input'             => 'hidden',

        'backend'           => '',

        'frontend'          => '',

        'label'             => 'Simple Position',

        'class'             => '',

        'source'            => '',

        'global'            => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_GLOBAL,

        'visible'           => true,

        'required'          => false,

        'user_defined'      => true,

        'default'           => '',

        'searchable'        => false,

        'filterable'        => false,

        'comparable'        => false,

        'visible_on_front'   => false,

        'visible_in_advanced_search'   => false,

        'unique'            => false,

        'apply_to'          => Mage_Catalog_Model_Product_Type::TYPE_CONFIGURABLE,

        'is_configurable'   => false,

    )

);

1. change 'index' => 'position_simple' to 'index' => 'entity_id' in your Observer.php (function addPositionColumn)


2. you need to get value of your position_simple attribute from configurable product and use it in added column - one way to do that:

create function in Observer.php

protected function _getDefaultConfigurationId() {

    /** @var Mage_Catalog_Model_Product $product */

    $product = Mage::registry('current_product');

    if ($product) {

        return array($product->getData('position_simple'));

    }

    return '';

}

and use that in your addPositionColumn function like that:

...    

'values' => $this->_getDefaultConfigurationId(),

...

After that, there is no need of observer type eav_collection_abstract_load_befor at all.