tranhien_it on "how to exclude all child category of a category"

$child_cat = (array)get_term_children($term_id, 'ratgeber-category');
$args = array(
'post_type'=> 'ratgeber',
'posts_per_page'=>5,
'tax_query' => array(
array('taxonomy' =>'ratgeber-category','field' =>'term_id','terms' => $child_cat,'operator' => 'NOT IN' ),
array('taxonomy' =>'ratgeber-category','field' =>'slug','terms' => $_GET['ratgeber-category'] )
)
);
$wp_query = new WP_Query($args);
if(have_posts()) { while (have_posts()): the_post();?>