Reply To: pre_get_posts – order posts by two different meta_keys (ACF select field)

• John Huebner

• June 3, 2017 at 11:51 pm

You need to set the meta_query just like you set the other query parameters in your filter.

$meta_query = array(
  array(
    'year_clause' => array(
      'key' => 'year',
      'compare' => 'EXISTS'
    )
  ),
  array(
    'month_clause' => array(
      'key' => 'month',
      'compare' => 'EXISTS'
    )
  )
);
$query->set('meta_query', $meta_query);
$query->set('orderby', array('year_clause' => 'DESC', 'month_clause' => 'DESC'));