I'm trying to programmatically add a custom option to a product, there are no errors being returned, but the custom option doesn't get added. I've tried a few methods to achieve this, without much luck.

Here's my code as it stands:

$product = $this->objectManager->get('Magento\Catalog\Model\Product')->load($productID);

$productOption = $this->objectManager->get('Magento\Catalog\Model\Product\Option');
    'title' => 'Text',
    'price' => '1.00',
    'max_characters' => '50',
    'price_type' => 'fixed',
    'sort_order' => '1'

Any ideas what I'm doing wrong?


I've now tried a different method:

$product = $this->objectManager->get('Magento\Catalog\Model\Product')->load($productID);
    'title' => 'Text',
    'type' => 'area',
    'is_require' => 1,
    'values' => [
            'title' => 'Text',
            'price' => '1.00',
            'price_type' => 'fixed',
            'max_characters' => '50'

But this gives me the following error:

[Magento\Framework\Validator\Exception] Invalid option value

However, I cannot figure out what's invalid.


You don't need to specify values for the option type you are trying to add. Please try example below.

/** @var \Magento\Catalog\Api\Data\ProductCustomOptionInterface $customOption */
$customOption = $this->objectManager->create('Magento\Catalog\Api\Data\ProductCustomOptionInterface');
$customOptions[] = $customOption;

Also, you can find a lot of examples on how to add products, attributes, options, etc in fixtures for integration tests. For instance, take a look in dev/tests/integration/testsuite/Magento/Catalog/_files

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