Topic Tag: Setting up custom fields

add_filter( 'wpv_filter_query', 'order_by_two_custom_fields',199,3 );
function order_by_two_custom_fields( $query_args, $views_settings, $view_id) {
  $view_ids = array( 12345 );
  $args = array();
  if (in_array($view_id, $view_ids)){
    $args = array(
      'meta_query' => array(
        'relation' => 'AND',
        'function-clause' => array(
          'key' => 'wpcf-function',
          'compare' => 'EXISTS',
          'type' => 'NUMERIC'
        ),
        'begin-clause' => array(
          'key' => 'wpcf-begin_date',
          'compare' => 'EXISTS',
          'type' => 'NUMERIC'
        )
      ),
      'orderby' => array(
        'function-clause' => 'ASC',
        'begin-clause' => 'ASC'
      )
    );
  }
  return array_merge($query_args, $args);
}