Exclude sub category posts from category display

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I rewrote the code from a post at WP Engineer:

function wpse_filter_child_cats( $query ) {

if ( $query->is_category ) {
    $queried_object = get_queried_object();
    $child_cats = (array) get_term_children( $queried_object->term_id, 'category' );

    if ( ! $query->is_admin )
        //exclude the posts in child categories
        $query->set( 'category__not_in', array_merge( $child_cats ) );
    }

    return $query;
}
add_filter( 'pre_get_posts', 'wpse_filter_child_cats' );

Give it a try by pasting the snippet in your functions.php. Please keep in mind that a post can’t belong to both parent category and child category, or you won’t get it displayed.

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