<?php
    public function add_template_vars()
    {
        if ( isset($this->posts) && count($this->posts) ) {
            $post = $this->post instanceof Post ? $this->post : $this->posts[0];
            if ( $this->post instanceof Post && count($this->posts) == 1 ) {
                $this->set_title( $post->title );
                if ( $post->typename == 'entry' ) {
                    $this->assign( 'next', $post->ascend() );
                    $this->assign( 'previous', $post->descend() );
                }
                if ( count($post->tags) ) {
                    $related = Posts::get(array(
                        'vocabulary' => $post->tags->getArrayCopy(),
                        'content_type' => $post->content_type,
                        'status' => Post::status('published'),
                        'not:id' => $post->id,
                        'limit' => 5,
                        'orderby' => 'Rand()'
                    ));
                    $this->assign( 'related_posts', $related );
                }
            }
        }
        elseif ( URL::get_matched_rule() == null ) {
            $this->set_title('Page Not Found');
        }
        parent::add_template_vars();
    }
?>