Magento 2 Multi select custom product attribute options not showing - attributes

Question

In my custom module, used installData.php to create a custom multiselect attribute. Where i have set the option values from my source class (using Magento\Eav\Model\Entity\Attribute\Source\AbstractSource) which is working fine after installation. I can see the options while editing the product.
But the options are not visible while editing the attribute. Im not able to add/remove option after this.
Please advise.
$eavSetup->addAttribute(
\Magento\Catalog\Model\Product::ENTITY,
'my_option',
[
'group' => 'General',
'label' => 'My Label',
'type' => 'text',
'input' => 'multiselect',
'user_defined' => true,
'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_STORE,
'source' => 'Vendor\Module\Model\Attribute\Source\Options',
'required' => false,
'filterable' => true,
'filterable_in_search' => true,
'is_searchable_in_grid' => false,
'is_used_in_grid' => false,
'is_visible_in_grid' => false,
'is_filterable_in_grid' => false,
'sort_order' => 200,
'used_in_product_listing' => true,
'backend' => 'Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend',
'visible' => true,
'visible_on_front' => true,
'searchable' => false,
'comparable' => false,
]
);

Answer 1

1. Create InstallData.php file at Vendor\Extension\Setup\ folder.
<?php
namespace Vendor\Extension\Setup;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
class InstallData implements InstallDataInterface
{
private $eavSetupFactory;
public function __construct(EavSetupFactory $eavSetupFactory)
{
$this->eavSetupFactory = $eavSetupFactory;
}
public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
{
$setup->startSetup();
$eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
$eavSetup->addAttribute(
\Magento\Catalog\Model\Product::ENTITY,
'eway_option',
[
'group' => 'Groupe Name',
'label' => 'Multiselect Attribute',
'type' => 'text',
'input' => 'multiselect',
'source' => 'Vendor\Extension\Model\Config\Product\Extensionoption',
'required' => false,
'sort_order' => 30,
'global' => \Magento\Catalog\Model\ResourceModel\Eav\Attribute::SCOPE_STORE,
'used_in_product_listing' => true,
'backend' => 'Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend',
'visible_on_front' => false
]
);
$setup->endSetup();
}
}
2. Create Extensionoption.php file at Vendor\Extension\Model\Config\Product folder.
<?php
namespace Vendor\Extension\Model\Config\Product;
use Magento\Eav\Model\Entity\Attribute\Source\AbstractSource;
class Extensionoption extends AbstractSource
{
protected $optionFactory;
public function getAllOptions()
{
$this->_options = [];
$this->_options[] = ['label' => 'Label 1', 'value' => 'value 1'];
$this->_options[] = ['label' => 'Label 2', 'value' => 'value 2'];
return $this->_options;
}
}