Fatal error: Call to a member function create() on null

Question

I am trying to create a customer custom attribute in Magento 2, but it's throwing an error.

Fatal error: Call to a member function create() on null in Custom\Setup\InstallData.php on line 47

For creating customer custom attribute I have written the code below.

<?php
namespace Learning\Custom\Setup;
use Magento\Customer\Setup;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
class InstallData implements InstallDataInterface
{
 /**
 * Customer setup factory
 *
 * @var CustomerSetupFactory
 */
 private $customerSetupFactory;
 /**
 * @var \Magento\Eav\Model\Entity\Attribute\SetFactory
 */
 protected $attributeSetFactory;
 /**
 * @param Setup\CustomerSetupFactory $customerSetupFactory
 */
 public function __construct(\Magento\Customer\Setup\CustomerSetupFactory $customerSetupFactory)
 {
 $this->customerSetupFactory = $customerSetupFactory;
 }
 /**
 * {@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();
 }
}

Could you please suggest where the problem might be?

• zus: Any help with mail function magento.stackexchange.com/q/300737/57334 @Bojjaiah

Answer 1

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();
 }
}

• Marius: isn't this what I answered 15 minutes ago?
• Suresh Chikani: I have added completed script code with use class.

Answer 2

I assume this is line 47: $attributeSet = $this->attributeSetFactory->create();.
If it is, then the problem is that $this->attributeSetFactory is alwasy null. You declared it in your class, but it never receives a value.
You should change the constructor to look like this:

public function __construct(
 \Magento\Customer\Setup\CustomerSetupFactory $customerSetupFactory,
 \Magento\Eav\Model\Entity\Attribute\SetFactory $attributeSetFactory
) {
 $this->customerSetupFactory = $customerSetupFactory;
 $this->attributeSetFactory = $attributeSetFactory;
}

And clear var/generation.

• Bojjaiah: Error: The configuration parameter "formElement" is a required for "approved_attribute" field.