Try the following (it worked pretty well for me, but you cant inline edit). I now got Admin Columns plugin instead, which works well to do this and allows editing and can do all the admin tables.
function add_product_column( $columns ) {
//add column
$columns['new_column'] = __( 'New column', 'woocommerce' );
return $columns;
}
add_filter( 'manage_edit-product_columns', 'add_product_column', 10, 1 );
function add_product_column_content( $column, $postid ) {
if ( $column == 'new_column' ) {
// output variable
$output = '';
// Get product object
$product = wc_get_product( $postid );
// Get Product Variations - WC_Product_Attribute Object
$product_attributes = $product->get_attributes();
// Not empty, contains values
if ( !empty( $product_attributes ) ) {
foreach ( $product_attributes as $product_attribute ) {
// Get name
$attribute_name = str_replace( 'pa_', '', $product_attribute->get_name() );
// Concatenate
$output = $attribute_name . ' = ';
// Get options
$attribute_options = $product_attribute->get_options();
// Not empty, contains values
if ( !empty( $attribute_options ) ) {
foreach ($attribute_options as $key => $attribute_option ) {
// WP_Term Object
$term = get_term($attribute_option); // <-- your term ID
// Not empty, contains values
if ( !empty( $term ) ) {
$term_name = $term->name;
// Not empty
if ( $term_name != '' ) {
// Last loop
end($attribute_options);
if ( $key === key($attribute_options) ) {
// Concatenate
$output .= $term_name;
} else {
// Concatenate
$output .= $term_name . ', ';
}
}
}
}
}
echo $output . '<br>';
}
}
}
}
add_action( 'manage_product_posts_custom_column', 'add_product_column_content', 10, 2 );