Remove attribute value from WooCommerce product using CRUD operation

Question

I have an global attribute pa_status with values such as new, old, custom. This attribute is used in my products.

I would like to remove the old value from a product using the CRUD operations available in WooCommerce.

The current code looks like this and doesn't work:

$id_product = 77233;
$attribute_name = 'pa_status';
$attribute_value_to_remove_by_id = 57;

$product = wc_get_product($id_product);
$attributes = $product->get_attributes();

if (isset($attributes[$attribute_name])) {
    $attributes[$attribute_name]['options'] = array_filter(
        $attributes[$attribute_name]['options'],
        function ($value) use ($attribute_value_to_remove_by_id) {
            return $value !== $attribute_value_to_remove_by_id;
        }
    );
}

$product->set_attributes($attributes);
$product->save();

Answer 1

I traced through xDebug what is happening in the save() method and it looks like the get_changes() method from WC_Product returns nothing. So no change is taking place in the DB

We need to create an instance of the WC_Product_Attribute class, and then perform operations on this object.

Now it seems to be working properly. Corrected code:

$id_product = 77233;
$attribute_name = 'pa_status';
$attribute_value_to_remove_by_id = 57;

$product = wc_get_product($id_product);
$attributes = $product->get_attributes();
$options = [];

if (isset($attributes[$attribute_name])) {
    $options = array_filter(
        $attributes[$attribute_name]['options'],
        function ($value) use ($attribute_value_to_remove_by_id) {
            return $value !== $attribute_value_to_remove_by_id;
        }
    );
}

$attribute = new WC_Product_Attribute();
$attribute->set_id(wc_attribute_taxonomy_id_by_name($attribute_name));
$attribute->set_name($attribute_name);
$attribute->set_options($options);
$attributes[$attribute_name] = $attribute;

$product->set_attributes($attributes);
$product->save();