Magento 2.3: How to add new product attribute options programmatically on Controller save?

Question

Is there a way to add new options, programmatically, for a product attribute with attribute code 'brand' that is already created from admin? I want to add new options on Controller Save action. The option values will be taken from custom admin form field(see image attached). enter image description here

Any help would be appreciated.

Answer 1

I found the solution myself:

public function __construct(
 \Magento\Eav\Api\AttributeOptionManagementInterface $attributeOptionManagement,
 \Magento\Eav\Api\Data\AttributeOptionLabelInterfaceFactory $optionLabelFactory,
 \Magento\Eav\Api\Data\AttributeOptionInterfaceFactory $optionFactory,
 \Magento\Framework\Message\ManagerInterface $messageManager
) {
 $this->attributeOptionManagement = $attributeOptionManagement;
 $this->optionLabelFactory = $optionLabelFactory;
 $this->optionFactory = $optionFactory;
 $this->messageManager = $messageManager;
}
public function addOptions() {
 
 $eavConfig = $this->_objectManager->create(\Magento\Eav\Model\Config::class);
 $attribute = $eavConfig->getAttribute('catalog_product', 'brand');
 $existingValues = $attribute->getSource()->getAllOptions(); // get existing attribute option values
 $existingLabels = [];
 foreach ($existingValues as $existingValue) {
 $existingLabels[] = explode(',', $existingValue['label']);
 }
 $labels = ['testvalue34']; // add new attribute value here
 if (!in_array($labels, $existingLabels)) {
 foreach ($labels as $label) {
 $optionLabel = $this->optionLabelFactory->create();
 $optionLabel->setStoreId(\Magento\Store\Model\Store::DEFAULT_STORE_ID);
 $optionLabel->setLabel($label);
 $option = $this->optionFactory->create();
 $option->setLabel($label);
 $option->setStoreLabels([$optionLabel]);
 $option->setSortOrder(0);
 $option->setIsDefault(false);
 $this->attributeOptionManagement->add(
 \Magento\Catalog\Model\Product::ENTITY,
 'manufacturer',
 $option
 );
 } 
 $messageManager->addSuccess(__("New attribute value saved"));
 } else {
 $messageManager->addError(__("Attribute value already exists"));
 }
}