WooCommerce Display List of Products With Missing Attribute?

Question

I've searched and searched but have not been able to find an answer to this, so thank you in advance for your help!

I am wanting to display a list (in the Admin portal, on the Products page) of all products that do NOT have a specific attribute assigned (so we can easily find products that need to be updated).

I have the same functionality already set up to display products that are missing other criteria (shipping class, weight, etc.) using a variation of this code and it works great, but I am not sure how to modify it to display products without the pa_sort-chassis attribute... so far, this is what I've got - it doesn't produce any results, though.

add_action( 'admin_notices', 'products_no_chassisattribute_admin' );
 
function products_no_chassisattribute_admin(){
    global $pagenow, $typenow;
    if ( 'edit.php' === $pagenow && 'product' === $typenow ) {
      echo '<div class="notice notice-warning is-dismissible"><h3>Products with NO Sort By Chassis Attribute</h3><ul>';
      $args = array(
         'status' => 'publish',
         'visibility' => 'visible',
         'limit' => -1
      );
      $products = wc_get_products( $args );
      foreach ( $products as $product ) {
         if ( ! $product = wc_get_products( array( 'pa_sort-chassis' => '' ) )) {
            echo '<li><a href="' . esc_url( get_edit_post_link( $product->get_id() ) ) . '">' . $product->get_name() . '</a></li>';
         }
      }
      echo '</ul></div>';
    }

I modified the code I was already using but it does not produce any results

Answer 1

The condition

if (! $product = wc_get_products(array('pa_sort-chassis' => ''))) 

will always evaluate to true because you are assigning a value to $product instead of checking its existence.

This will cause the loop to always execute the echo statement inside the if block.

function products_no_chassisattribute_admin() {
    global $pagenow, $typenow;
    if ( 'edit.php' === $pagenow && 'product' === $typenow ) {
        echo '<div class="notice notice-warning is-dismissible"><h3>Products with NO Sort By Chassis Attribute</h3><ul>';
        $args = array(
            'status' => 'publish',
            'visibility' => 'visible',
            'limit' => -1
        );
        $products = wc_get_products( $args );
        foreach ( $products as $product ) {
            $product_attributes = $product->get_attributes();
            if ( empty( $product_attributes['pa_sort-chassis'] ) ) {
                echo '<li><a href="' . esc_url( get_edit_post_link( $product->get_id() ) ) . '">' . $product->get_name() . '</a></li>';
            }
        }
        echo '</ul></div>';
    }
}

Answer 2

To display products that do not have the "pa_sort-chassis" attribute assigned!

Please try this code and it should display the products that do not have the "pa_sort-chassis" attribute assigned in the Admin portal on the Products page.

add_action( 'admin_notices', 'products_no_chassisattribute_admin' );
function products_no_chassisattribute_admin() {
    global $pagenow, $typenow;
    if ( 'edit.php' === $pagenow && 'product' === $typenow ) {
        echo '<div class="notice notice-warning is-dismissible"><h3>Products with NO Sort By Chassis Attribute</h3><ul>';
        $args = array(
            'status'     => 'publish',
            'visibility' => 'visible',
            'limit'      => -1
        );
        $products = wc_get_products( $args );
        foreach ( $products as $product ) {
            $product_attributes = $product->get_attributes();
            if ( ! array_key_exists( 'pa_sort-chassis', $product_attributes ) ) {
                echo '<li><a href="' . esc_url( get_edit_post_link( $product->get_id() ) ) . '">' . $product->get_name() . '</a></li>';
            }
        }
        echo '</ul></div>';
    }
}

Use the get_attributes() method to retrieve all the attributes of a product. Then, check if the key 'pa_sort-chassis' exists in the $product_attributes array. If it doesn't exist, it means the product does not have the "pa_sort-chassis" attribute assigned, and it will be displayed in the list.