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I need to add a custom attribute (contact_number) for customer in Magento2 via an existing module, so I am using UpgradeData.php. Can anyone please tell what I have missed out.

use MagentoFrameworkSetupUpgradeDataInterface;

use MagentoFrameworkSetupModuleContextInterface;

use MagentoFrameworkSetupModuleDataSetupInterface;

use MagentoEavModelEntityAttributeSet as AttributeSet;

use MagentoEavModelEntityAttributeSetFactory as AttributeSetFactory;

use MagentoCustomerModelCustomer;



class UpgradeData implements UpgradeDataInterface {



private $customerSetupFactory;

private $attributeSetFactory;



public function __construct(

MagentoCustomerSetupCustomerSetupFactory $customerSetupFactory, AttributeSetFactory $attributeSetFactory

) {

    $this->customerSetupFactory = $customerSetupFactory;

    $this->attributeSetFactory = $attributeSetFactory;

}



public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context) {

    //if (version_compare($context->getVersion(), "1.0.1", "<")) 

    {

        $setup->startSetup();

        $customerSetup = $this->customerSetupFactory->create(['setup' => $setup]);

        $customerSetup->addAttribute(MagentoCustomerModelCustomer::ENTITY, 'contact_number', array(

            [

                'type' => 'varchar',

                'label' => 'Contact Number',

                'input' => 'text',

                'required' => true,

                'visible' => true,

                'user_defined' => true,

                'position' => 999,

                'system' => 0,

            ]

        ));



        $Attribute = $customerSetup->getEavConfig()->getAttribute( MagentoCustomerModelCustomer::ENTITY, 'contact_number');

        $Attribute->setData(

        'used_in_forms',

            [

             'adminhtml_checkout','adminhtml_customer','adminhtml_customer_address','customer_account_edit','customer_address_edit','customer_register_address'

            ]

    );

        $Attribute->save();

        $setup->endSetup();

}

}



}

Not getting what I am doing wrong. Any help, please.

[edit]
: Not getting the label in the backend as well:
Please find the screen-shot attached.

Check if you have updated module version in module.xml and composer.json file before running php bin/magento setup:upgrade.

You can create custom attribute using InstallData.php file on below path :

/app/code/CompanyName/ModuleName/Setup/

use MagentoCustomerModelCustomer;

use MagentoCustomerSetupCustomerSetupFactory;

use MagentoEavModelEntityAttributeSet as AttributeSet;

use MagentoEavModelEntityAttributeSetFactory as AttributeSetFactory;

use MagentoFrameworkSetupInstallDataInterface;

use MagentoFrameworkSetupModuleContextInterface;

use MagentoFrameworkSetupModuleDataSetupInterface;

use MagentoFrameworkAppResourceConnection;

use MagentoEavModelEntityAttributeSourceBoolean;



/**

 * @codeCoverageIgnore

 */

class InstallData implements InstallDataInterface

{



    /**

     * @var CustomerSetupFactory

     */

    protected $customerSetupFactory;



    /**

     * @var AttributeSetFactory

     */

    private $attributeSetFactory;

    /**

     * @var MagentoIndexerModelIndexerFactory

     */

    protected $indexerFactory;

    /**

     * @param CustomerSetupFactory $customerSetupFactory

     * @param AttributeSetFactory $attributeSetFactory

     */

    public function __construct(

        CustomerSetupFactory $customerSetupFactory,

        AttributeSetFactory $attributeSetFactory,

        ResourceConnection $resource,

        MagentoFrameworkIndexerIndexerInterfaceFactory $indexerFactory

    ) {

        $this->customerSetupFactory = $customerSetupFactory;

        $this->attributeSetFactory = $attributeSetFactory;

        $this->resource = $resource;

        $this->indexerFactory = $indexerFactory;

    }



    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, 'is_allow', [

            'type' => 'int',

            'label' => 'Allow',

            'input' => 'select',

            'source' => Boolean::class,

            'required' => true,

            'default' => '1',

            'sort_order' => 300,

            'user_defined' => true,

            'system' => false,

            'position' => 400,

            'is_used_in_grid' => true,

            'is_visible_in_grid' => true,

            'is_filterable_in_grid' => true,

        ]);

        $attribute = $customerSetup->getEavConfig()->getAttribute(Customer::ENTITY, 'is_allow')

            ->addData([

                'attribute_set_id' => $attributeSetId,

                'attribute_group_id' => $attributeGroupId,

                'used_in_forms' => ['adminhtml_customer'], //you can use other forms also ['adminhtml_customer_address', 'customer_address_edit', 'customer_register_address']

            ]);



        $attribute->save();

    }

}

Then, php bin/magento s:up execute this command and cache clean.

Unless you haven't copy/pasted your whole file, I think you may be missing a namespace. Without it, the UpgradeData script will not run.

namespace YourVendorYourModuleSetup; before your use statements.