Magento 2 – Fix ‘Call to a Member Function getIsInStock() on Null’ Error

magento-2.1magento2productservice-contractstock

I try to access stock data for a product, using

$product->getExtensionAttributes()->getStockItem()->getIsInStock()

and receive the following error on this line

PHP Fatal error: Call to a member function getIsInStock() on null.

Obviously the stock_item extension attribute was not loaded. $product comes from the product repository and has been loaded with $productRepository->getList().

How can I get products with stock information from the product repository?

Best Answer

Apparently this is not possible in a reasonable way as of Magento 2.1

You can use the stock registry and pass each item of the result to Magento\CatalogInventory\Helper\Stock::assignStatusToProduct().

But this results in a single database query for each product. In my tests with 2000 products, this takes three times longer than loading the collection directly with Magento\CatalogInventory\Model\ResourceModel\Stock\Status::addStockDataToCollection()

To optimize the stock registry, one would have to add a method to fetch multiple stock items at once and assign them to an array of products.

Related Solutions

Magento2 Blocks Error – Fatal Error Call to a Member Function Dispatch While Calling Block in Magento 2

The problem is that your constructor does not match the parent class constructor.

To fix that you need to update your constructor:

public function __construct(
    \Magento\Framework\View\Element\Template\Context $context,
    \Magento\Customer\Model\Session $customerSession,  
    \Magento\Framework\ObjectManagerInterface $objectManager,
    array $data = []
 ) {
    parent::__construct($context, $data);
    $this->customerSession = $customerSession;
    $this->_objectManager = $objectManager;
  }

Don't forget to flush the var/cache and var/generation after your changes.

Fatal Error: Call to a Member Function create() on Null – Solution

Check my below suggestion code.

<?php
namespace Learning\Custom\Setup;

use Magento\Customer\Setup\CustomerSetupFactory;
use Magento\Customer\Model\Customer;
use Magento\Eav\Model\Entity\Attribute\Set as AttributeSet;
use Magento\Eav\Model\Entity\Attribute\SetFactory as AttributeSetFactory;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;

class InstallData implements InstallDataInterface
{

    /**
     * @var CustomerSetupFactory
     */
    protected $customerSetupFactory;

    /**
     * @var AttributeSetFactory
     */
    private $attributeSetFactory;

    /**
     * @param CustomerSetupFactory $customerSetupFactory
     * @param AttributeSetFactory $attributeSetFactory
     */
    public function __construct(
        CustomerSetupFactory $customerSetupFactory,
        AttributeSetFactory $attributeSetFactory
    ) {
        $this->customerSetupFactory = $customerSetupFactory;
        $this->attributeSetFactory = $attributeSetFactory;
    }


    /**
     * {@inheritdoc}
     * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
     */
    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        /** @var CustomerSetup $customerSetup */
        $customerSetup = $this->customerSetupFactory->create(['setup' => $setup]);


        $customerEntity = $customerSetup->getEavConfig()->getEntityType('customer');

        $attributeSetId = $customerEntity->getDefaultAttributeSetId();


        /** @var $attributeSet AttributeSet */
        $attributeSet = $this->attributeSetFactory->create();

        $attributeGroupId = $attributeSet->getDefaultGroupId($attributeSetId);



        $customerSetup->addAttribute(Customer::ENTITY, 'custom_name', [
            'type' => 'varchar',
            'label' => 'Custom Name',
            'input' => 'text',
            'class' => '',
            'source' => '',
            'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
            /*Scope of your attribute */
            'required' => false,
            'visible' => true,
            'user_defined' => true,
            'position' =>999,
            'system' => 0,
        ]);

        $attribute = $customerSetup->getEavConfig()->getAttribute(Customer::ENTITY, 'approved_attribute')
            ->addData([
                'attribute_set_id' => $attributeSetId,
                'attribute_group_id' => $attributeGroupId,
                'used_in_forms' => ['adminhtml_customer'],
            ]);

        $attribute->save();
    }


}

Best Answer

Related Solutions

Magento2 Blocks Error – Fatal Error Call to a Member Function Dispatch While Calling Block in Magento 2

Fatal Error: Call to a Member Function create() on Null – Solution

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