There is a common way to add a new product option programmatically.

<?php
// AttributeOptionInterfaceFactory
$option = $this->optionFactory->create();
$option->setLabel($label);

// ProductAttributeOptionManagementInterface
$this->productAttributeOptionManagement->add(
    $attributeCode,
    $option
);

But it won’t work if a type of attribute is “Swatch”. At least in Magento 2.2.1 and 2.2.2

The problem is already fixed in the development branch and will be available in 2.2.3 and similar 2.1.* release.

But for now, you have to apply the fix by yourself. You need to rewrite the \Magento\Swatches\Model\Plugin\EavAttribute class and update setProperOptionsArray method. That’s how to do it step by step.

1. Create a new class, for example VF\BestPractices\Model\Swatches\Plugin\EavAttribute.

2. Rewrite the setProperOptionsArray method with the latest version from magento repository, so the class will look like this.

   <?php
   
   namespace VF\BestPractices\Model\Swatches\Plugin;
   
   use Magento\Catalog\Model\ResourceModel\Eav\Attribute;
   
   /**
    * Class EavAttribute
    *
    * TODO: Temporary fix - remove after update to magento to 2.2.3 or higher
    */
   class EavAttribute extends \Magento\Swatches\Model\Plugin\EavAttribute
   {
       /**
        * {@inheritdoc} 
        */
       protected function setProperOptionsArray(Attribute $attribute)
       {
           $canReplace = false;
           if ($this->swatchHelper->isVisualSwatch($attribute)) {
               $canReplace = true;
               $defaultValue = $attribute->getData('defaultvisual');
               $optionsArray = $attribute->getData('optionvisual');
               $swatchesArray = $attribute->getData('swatchvisual');
           } elseif ($this->swatchHelper->isTextSwatch($attribute)) {
               $canReplace = true;
               $defaultValue = $attribute->getData('defaulttext');
               $optionsArray = $attribute->getData('optiontext');
               $swatchesArray = $attribute->getData('swatchtext');
           }
           if ($canReplace == true) {
               if (!empty($optionsArray)) {
                   $attribute->setData('option', $optionsArray);
               }
               if (!empty($defaultValue)) {
                   $attribute->setData('default', $defaultValue);
               } else {
                   $attribute->setData('default', [0 => $attribute->getDefaultValue()]);
               }
               if (!empty($swatchesArray)) {
                   $attribute->setData('swatch', $swatchesArray);
               }
           }
       }
   }

3. Add to your module’s di.xml

   <!-- TODO: Temporary fix - remove after upgrade to magento 2.2.3 or higher -->
   <type name="Magento\Catalog\Model\ResourceModel\Eav\Attribute">
       <plugin name="save_swatches_option_params" type="VF\BestPractices\Model\Swatches\Plugin\EavAttribute"/>
   </type>

That’s it.

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