public function product_query( $q ) {
    if ( ! is_feed() ) {
      $ordering = $this->get_catalog_ordering_args();
      $q->set( 'orderby', $ordering['orderby'] );
      $q->set( 'order', $ordering['order'] );

      if ( isset( $ordering['meta_key'] ) ) {
        $q->set( 'meta_key', $ordering['meta_key'] );
      }
    }

    // Query vars that affect posts shown.
    $q->set( 'meta_query', $this->get_meta_query( $q->get( 'meta_query' ), true ) );
    $q->set( 'tax_query', $this->get_tax_query( $q->get( 'tax_query' ), true ) );
    $q->set( 'wc_query', 'product_query' );
    $q->set( 'post__in', array_unique( (array) apply_filters( 'loop_shop_post_in', array() ) ) );

    // Work out how many products to query.
    $q->set( 'posts_per_page', $q->get( 'posts_per_page' ) ? $q->get( 'posts_per_page' ) : apply_filters( 'loop_shop_per_page', wc_get_default_products_per_row() * wc_get_default_product_rows_per_page() ) );

    // Store reference to this query.
    self::$product_query = $q;

    // Additonal hooks to change WP Query.
    add_filter( 'posts_clauses', array( $this, 'price_filter_post_clauses' ), 10, 2 );
    add_filter( 'the_posts', array( $this, 'handle_get_posts' ), 10, 2 );
    add_filter( 'found_posts', array( $this, 'adjust_posts_count' ), 10, 2 );
    do_action( 'woocommerce_product_query', $q, $this );
  }