Country Dropdown For Custom Product Attribute does not work

Question

I am trying to create a country dropdown for a custom product attribute.

This is the error message:

Error: Call to undefined method Magento\Directory\Model\Config\Source\Country::setAttribute() in /var/www/html/vendor/magento/module-eav/Model/Entity/Attribute/AbstractAttribute.php:652

This is my install:

$eavSetup->addAttribute(
            \Magento\Catalog\Model\Product::ENTITY,
            'countries',
            [
                'group' => 'Countries',
                'type' => 'text',
                'frontend' => '',
                'label' => 'Countries',
                'input' => 'multiselect',
                'class' => '',
                'source' => 'Magento\Directory\Model\Config\Source\Country',
                'backend' => 'Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend',
                'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
                'visible' => true,
                'required' => false,
                'user_defined' => false,
                'default' => '',
                'searchable' => false,
                'filterable' => false,
                'comparable' => false,
                'visible_on_front' => false,
                'used_in_product_listing' => false,
                'unique' => false,
                'apply_to' => 'configurable',
            ]
        );

The issue is with the source:

'source' => 'Magento\Directory\Model\Config\Source\Country'

Answer 1

you can replace it with the following code using setup patch data create AddCountryDropdownAttribute.php file on below path Vendor\Module\Setup\Patch\Data

<?php
declare(strict_types=1);

namespace Vendor\Module\Setup\Patch\Data;

use Magento\Catalog\Model\Product;
use Magento\Catalog\Model\ResourceModel\Eav\Attribute;
use Magento\Catalog\Setup\CategorySetupFactory;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\Patch\DataPatchInterface;

class AddCountryDropdownAttribute implements DataPatchInterface
{

  /**
   * @var ModuleDataSetupInterface
   */
  private $moduleDataSetup;

  /**
   * @var CategorySetupFactory
   */
   private $categorySetupFactory;

  /**
   * AddCountryDropdownAttribute constructor.
   *
   * @param ModuleDataSetupInterface $moduleDataSetup
   * @param CategorySetupFactory $categorySetupFactory
   */
    public function __construct(
       ModuleDataSetupInterface $moduleDataSetup,
       CategorySetupFactory $categorySetupFactory
    ) {
      $this->moduleDataSetup = $moduleDataSetup;
      $this->categorySetupFactory = $categorySetupFactory;
    }

  /**
   * @inheritDoc
   */
   public function apply()
   { 
     $this->moduleDataSetup->startSetup();

     $categorySetup = $this->categorySetupFactory->create(['setup' => $this->moduleDataSetup]);

     $attributeCode = 'country_of_origin';
     $attributeOptions = [
        'type' => 'int',
        'label' => 'Country of Origin',
        'input' => 'select',
        'source' => 'Magento\Directory\Model\Config\Source\Country',
        'required' => false,
        'sort_order' => 100,
        'global' => Attribute::SCOPE_GLOBAL,
        'user_defined' => true,
        'visible' => true,
        'searchable' => false,
        'filterable' => true,
        'comparable' => false,
        'visible_on_front' => false,
        'html_allowed_on_front' => false,
        'backend' => 'Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend',
    ];

    $categorySetup->addAttribute(Product::ENTITY, $attributeCode, $attributeOptions);

    $this->moduleDataSetup->endSetup();
}

  /**
   * @inheritDoc
   */
   public static function getDependencies()
   {
      return [];
   }

   /**
    * @inheritDoc
    */
   public function getAliases()
   {
     return [];
   }      
}

Answer 2

Add Custom Product Attribute for Country Dropdown (using setup patch data) follow below steps:

• Add AddCountryAttribute.php in the following file path : app\code\Vendor\Extention\Setup\Patch\Data

---

<?php
namespace Vendor\Extention\Setup\Patch\Data;

use Magento\Eav\Setup\EavSetup;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\Patch\DataPatchInterface;

class AddCountryAttribute implements DataPatchInterface
{
    private $_moduleDataSetup;

    private $_eavSetupFactory;

    public function __construct(
        ModuleDataSetupInterface $moduleDataSetup,
        EavSetupFactory $eavSetupFactory
    ) {
        $this->_moduleDataSetup = $moduleDataSetup;
        $this->_eavSetupFactory = $eavSetupFactory;
    }

    public function apply()
    {
        /** @var EavSetup $eavSetup */
        $eavSetup = $this->_eavSetupFactory->create(['setup' => $this->_moduleDataSetup]);

        $eavSetup->addAttribute(\Magento\Catalog\Model\Product::ENTITY, 'country_options', [
            'label'                      => 'Available in Country',
            'input'                      => 'select',
            'type'                       => 'varchar',
            'backend'                    => '\Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend',
            'frontend'                   => null,
            'source'                     => '\Magento\Catalog\Model\Product\Attribute\Source\Countryofmanufacture',
            'global'                     => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
            'required'                   => false,
            'user_defined'               => false,
            'class'                      => null,
            'unique'                     => false,
            'searchable'                 => false,
            'filterable'                 => false,
            'comparable'                 => false,
            'visible_on_front'           => false,
            'is_configurable'            => false,
            'visible'                    => true,
        ]);
    }

    public static function getDependencies()
    {
        return [];
    }

    public function getAliases()
    {
        return [];
    }

    public static function getVersion()
    {
        return '1.0.0';
    }
}

Answer 3

Replace the source with the below code and check

'source' => \Magento\Catalog\Model\Product\Attribute\Source\Countryofmanufacture::class