Get Grouped Products Associated Child Product Custom Attribute

Question

I've created a few product attributes with these settings:

• Scope: Store View
• Add to Column Options: Yes
• Visible on Catalog Pages on Storefront: Yes
• Used in Product Listing: Yes
• Used for sorting in Product Listing: Yes

In my grouped product, I have a value:

[![enter image description here][1]][1]

But, in my custom /design/frontend/Vendor/Theme/Magento_GroupedProduct/templates/product/view/type/grouped.phtml file, I've got this:

<?php
    $writer = new \Zend\Log\Writer\Stream(BP . '/var/log/trey.log');
    $logger = new \Zend\Log\Logger();
    $logger->addWriter($writer);

    foreach ($_item->getAttributes() as $attr)
    {
        $logger->info(
            $attr->getAttributeCode(). ': '. $attr->getFrontend()->getValue($_item)
        );
    }
?>

Which produces these (skimmed) results in the log file:

2019-12-03T10:23:01+00:00 INFO (6): entity_id: 228
2019-12-03T10:23:02+00:00 INFO (6): type_id: simple
2019-12-03T10:23:02+00:00 INFO (6): attribute_set_id: 4
2019-12-03T10:23:02+00:00 INFO (6): status: Enabled
2019-12-03T10:23:02+00:00 INFO (6): name: Bulb 501 w5w 12v
2019-12-03T10:23:02+00:00 INFO (6): sku: BULB-501-SIN001
2019-12-03T10:23:02+00:00 INFO (6): price: 1.1900
2019-12-03T10:23:02+00:00 INFO (6): ref_code:
2019-12-03T10:23:02+00:00 INFO (6): image_ref:
2019-12-03T10:23:02+00:00 INFO (6): required:

As you can see, ref_code, image_ref and required is empty, but I'm not sure why as the values are there in the database. I've tried re-indexing fully and clearing cache via rm -rf /var/cache/*

The methods listed in:

• Magento 2: How to display custom attribute in catalog
• Magento 2: Get custom attribute value of product

didn't work.

I didn't try the Object Manager method as I don't wish to use it as I know it's not the right way to go.

Edit:

snappy of my attribute:

Edit 2:

I created a module as advised, but couldn't get it 100%. This is the code I implemented:

|-app
|-----code
|---------Vendor
|-------------Module
|-----------------etc
|---------------------frontend
|-------------------------di.xml
|---------------------module.xml
|-----------------Plugin
|---------------------Model
|-------------------------Product
|-----------------------------Type
|---------------------------------Grouped.php
|-----------------registration.php

di.xml

<?xml version="1.0" encoding="UTF-8"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\GroupedProduct\Model\Product\Type\Grouped">
        <plugin name="addAttributes" type="Vendor\Module\Model\Plugin\Product\Type\Grouped" />
    </type>
</config>

module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="Vendor_Module" setup_version="0.0.1">
        <sequence>
            <module name="Magento_Catalog" />
            <module name="Magento_GroupedProduct" />
        </sequence>
    </module>
</config>

Grouped.php

namespace Vendor\Module\Model\Plugin\Product\Type;

class Grouped
{
    /**
     * @param $subject
     * @param $result
     *
     * @return mixed
     */
    public function afterGetAssociatedProductCollection($subject, $result)
    {
        $result->addAttributeToSelect('*');

        return $result;
    }
}

registration.php

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'Vendor_Module',
    __DIR__
);

Answer 1

Create di.xml file here in your custom module

app/code/Vendor/Module/etc/di.xml

Content for this file is..

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\GroupedProduct\Model\Product\Type\Grouped" type="Vendor\Module\Model\Product\Type\Grouped" />
</config>

Now you need to create Model file here in your custom module..

app/code/Vendor/Module/Model/Product/Type/Grouped.php

Content for this file is..

<?php

namespace Vendor\Module\Model\Product\Type;

use Magento\Catalog\Api\ProductRepositoryInterface;

class Grouped extends \Magento\GroupedProduct\Model\Product\Type\Grouped
{
    public function getAssociatedProductCollection($product)
    {
        parent::getAssociatedProductCollection($product);
        $links = $product->getLinkInstance();
        $links->setLinkTypeId(\Magento\GroupedProduct\Model\ResourceModel\Product\Link::LINK_TYPE_GROUPED);
        $collection = $links->getProductCollection()->addAttributeToSelect('*')->setFlag(
            'product_children',
            true
        )->setIsStrongMode();
        $collection->setProduct($product);
        return $collection;
    }
}

Note : Here Vendor is your module's namespace and Module is your module name in above file path.

Hope this will help you!

Answer 2

[Not sure if it's the correct way]

Take a look at vendor/magento/module-grouped-product/Model/Product/Type/Grouped.php

public function getAssociatedProducts($product) 
{
   ...
     ->addAttributeToSelect(
                ['name', 'price', 'special_price', 'special_from_date', 'special_to_date', 'tax_class_id']
   ...
}

Seems that Magento just sets some fields.

My suggestion is to use Plugin to add your custom fields. For example:

app/code/Vendor/CatalogAttributes/etc/frontend/di.xml

<?xml version="1.0" encoding="UTF-8" ?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\GroupedProduct\Model\Product\Type\Grouped">
        <plugin name="addAttributes"
                type="Vendor\CatalogAttributes\Model\Plugin\Product\Type\Grouped"/>
    </type>
</config>

app/code/Vendor/CatalogAttributes/Model/Plugin/Product/Type/Grouped.php

<?php declare(strict_types=1);

namespace Vendor\CatalogAttributes\Model\Plugin\Product\Type;

use Magento\Catalog\Model\ResourceModel\Product\Link\Product\Collection;

class Grouped
{
    /**
     * @param $subject
     * @param Collection $result
     * @return Collection $result
     */
    public function afterGetAssociatedProductCollection($subject, $result)
    {
        $result->addAttributeToSelect(['ref_code']);
        return $result;
    }
}

Answer 3

I have created a viewmodel for displaying the custom attribute of the simple products in the grouped.phtml

<referenceBlock name="product.info.grouped.retailbb">
            <arguments>
                <argument name="view_model" xsi:type="object">BA\BasysProdLayouts\ViewModel\GetAttributes</argument>
            </arguments>
        </referenceBlock>

ViewModel Class

namespace BA\BasysProdLayouts\ViewModel;

use Magento\Eav\Model\ResourceModel\Entity\Attribute\Group\CollectionFactory;
use Magento\CatalogInventory\Model\Stock\StockItemRepository;
use Psr\Log\LoggerInterface;

class GetAttributes implements \Magento\Framework\View\Element\Block\ArgumentInterface
{
    protected $groupCollection;
    protected $logger;
    protected $stockItemRepository;
    private $attrsArray = [];
public function __construct(CollectionFactory $groupCollection, LoggerInterface $logger, StockItemRepository $stockItemRepository)
{
    $this->groupCollection = $groupCollection;
    $this->stockItemRepository = $stockItemRepository;
    $this->logger = $logger;
}
public function createAttributeArray($groupId, $item)
{
    $productAttributes = $item->getAttributes($groupId);
    $productStock = $this
        ->stockItemRepository
        ->get($item->getId());
    $this->attrsArray['stock'][$item->getId() ] = $productStock->getQty();
    foreach ($productAttributes as $attribute)
    {
        $attrCode = $attribute->getAttributeCode();
        $attrValue = $item->getResource()
            ->getAttributeRawValue($item->getId() , $attrCode, $item->getId());
        /* Checking for blank values */
        $finalValue = is_array($attrValue) ? '' : $attrValue;
        $this->attrsArray[$attrCode][$item->getId() ] = $finalValue;
    }
}
public function getLayoutCustAttributes($items)
{
    $groupCollection = $this
        ->groupCollection
        ->create();
    $groupCollection->addFieldToFilter('attribute_group_name', 'Layout Customizations');
    $groupId = $groupCollection->getFirstItem()
        ->getData('attribute_group_id');
    foreach ($items as $item)
    {
        $this->createAttributeArray($groupId, $item);
    }
    $this->filterEmptyAttributes();
    return $this->attrsArray;
}
private function filterEmptyAttributes()
{
    foreach ($this->attrsArray as $key => $innerArray)
    { //check for each element
        foreach ($innerArray as $innerValue)
        {
            if (!empty($innerValue))
            {
                continue 2; //stop investigating at first non empty, we shoud keep this
                
            }
        }
        //all values in innerArray are empty, drop this
        unset($this->attrsArray[$key]);
    }
}
}

In the grouped.phtml

        <?php $attrArray = $block->getViewModel()->getLayoutCustAttributes($_associatedProducts);
?>