query order by category

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i have this line.. in sidebar.. 

<?php query_posts ( ( array('orderby' => 'rand', 'showposts' => 12)));?>

i want to order by category not random..
so if i am in a post from category animals.. i want to show 12 post just from this category.
Not Random like now..

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how can i do that?

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1 comment

  1. This should limit the posts pulled in the new WP_Query instance to the currently selected category or the first category of the current post.

    global $wp_query;
$sidebar_query_vars = array('orderby' => 'rand', 'showposts' => 12);
if(is_category()) {
    $sidebar_query_vars['cat'] = $wp_query->get_queried_object()->term_id;
} elseif (is_single()) {
    $categories = (get_the_terms($wp_query->get_queried_object_id(), 'category'));
    if(is_array($categories)) {
        $first_cat = array_shift($categories);
        $sidebar_query_vars['cat'] = $first_cat->term_id;
    }
}
$sidebar_query = new WP_Query($sidebar_query_vars);
while($sidebar_query->have_posts()): $sidebar_query->the_post();
//do output here
endwhile;