wordpress - WP Query ignores variable for specific category -

ok i'm missing obvious here since it's simple thing, reason can't wp query work. want query posts category page user visiting (using get_the_category). -

$category = get_the_category(); $category_id = $category[0]->cat_id;  $category_items = new wp_query( array(     'post_type' => 'post',     'cat' => $category_id,     'showposts' => -1,     'orderby' => 'rand'     ) ); 

$category_id gives me correct id category page, referring inside wp query makes query posts regardless of category.

try this:

$category = get_the_category(); $category_name = $category[0]->cat_name;  $category_items = new wp_query( array(     'post_type' => 'post',     'category_name' => $category_name,     'showposts' => -1,     'orderby' => 'rand'     ) );