I am adding custom admin filters for my custom post types. I am a bit confused about how to go with the parse_query filter in order to have my posts filtered based on 2 or more filters.

Initially for 1 filter, I can do:

$query->query_vars['meta_key'] = 'city';
$query->query_vars['meta_value'] = $cityId;
$query->query_vars['meta_compare'] = '=';

and I will get my filtered results.

I am wondering, if WP would accept more meta_keys/values for the query_vars…

I am trying to set a meta_query and below is what I have done – but it doesn’t work.

add_filter( 'parse_query', 'wpr_manager_filter' );
function  wpr_manager_filter($query) {
  global $page;
  $current_page = isset( $_GET['post_type'] ) ? $_GET['post_type'] : '';

  if ( is_admin()
    && 'properties' == $current_page
    && 'edit.php' == $page
  )
  {
    $metaQuery = array();
    if (isset( $_GET['city-filter'] ) && $_GET['city-filter'] != '-1')
    {
      $cityId = (int)$_GET['city-filter'];
      $metaQuery['relation'] = 'AND';
      $metaQuery[] = array(
        'meta_key' => 'city',
        'meta_value' => $cityId,
        'meta_compare' => '='
      );

      // $query->query_vars['meta_key'] = 'city';
      // $query->query_vars['meta_value'] = $cityId;
      // $query->query_vars['meta_compare'] = '=';
    }
    if (isset( $_GET['visibility-filter'] ) && $_GET['visibility-filter'] != '-1')
    {
      $visibility = (int)$_GET['visibility-filter'];
      $metaQuery[2] = array(
        'meta_key' => 'visibility',
        'meta_value' => $visibility,
        'meta_compare' => '='
      );
    }
    $query->meta_query = $metaQuery;
  }
}

It has been a long day, and I have just start getting more familiar with deeper WP concepts, so any kind of help that will push me forward and will explain me what I am doing wrong it would be greatly appreciated.