按自定义帖子类型排序的WordPress搜索结果未分组

Question

对于一个WordPress网站，我有几个自定义帖子类型，名为“城市”和“书籍”，以及常规博客帖子。我已自定义搜索结果（仅在帖子标题中搜索）页面，以便按自定义帖子类型排序结果。但问题是自定义帖子类型中的搜索结果并未真正分组。示例：当我搜索字母'am'时，我会在搜索结果页面中获得以下结果：

BOOKS
-----
Book 1

CITIES
------
City 1

BOOKS
-----
Book 2
Book 3

CITIES
------
City 2
City 3
City 4

BLOGPOSTS
---------
Post 1
Post 2
Post 3
etc.

我想要的是什么：

BOOKS
-----
Book 1
Book 2
Book 3

CITIES
------
City 1
City 2
City 3
City 4

BLOGPOSTS
---------
Post 1
Post 2
Post 3
etc.

这是我的循环：

<?php if(have_posts()) : ?>

                            <?php   
                                $last_type = "";
                                $typecount = 0;
                                while ( have_posts() ) : the_post();
                            ?>

                                <?php
                                    if ($last_type != $post->post_type){
                                        $typecount = $typecount + 1;
                                        if ($typecount > 1){
                                            echo '</div><!-- close type-container -->'; //close type container
                                        }

                                        // save the post type.
                                        $last_type = $post->post_type;

                                        //open type container
                                        switch ($post->post_type) {
                                            case 'books':
                                                echo "<div class=\"books-container\"><h2>";
                                                _e('Books', 'qode');
                                                echo "</h2>";
                                            break;

                                            case 'cities':
                                                echo "<div class=\"cities-container\"><h2>";
                                                _e('Destinations', 'qode');
                                                echo "</h2>";
                                            break;

                                            case 'post':
                                                echo "<div class=\"blog-container\"><h2>";
                                                _e('Blogposts', 'qode');
                                                echo "</h2>";
                                            break;
                                        }
                                    }
                                ?>

                                <?php if('books' == get_post_type()) : ?>

                                     <?php get_template_part('templates/books_search', 'loop'); ?>

                                <?php elseif('cities' == get_post_type()) : ?>

                                    <?php get_template_part('templates/cities_search', 'loop'); ?>

                                <?php elseif('post' == get_post_type()) : ?>

                                    <?php get_template_part('templates/blog_search', 'loop'); ?>

                                <?php endif; ?>                     

                            <?php endwhile; // endwhile have_posts ?>

                            <?php // Pagination ?>
                            <?php if($qode_options_proya['pagination'] != "0") : ?>
                                <?php pagination($wp_query->max_num_pages, $blog_page_range, $paged); ?>
                            <?php endif; ?>

                            <?php else: //If no posts are present ?>
                                <div class="entry nothing-found">                        
                                    <h3><?php _e('Sorry, there is no 100% ', 'qode') . " " . the_search_query() . " " . _e(' yet.') ?></h3>
                                    <p><?php _e('But there are loads of other 100% destinations available. Try again in the searchfield below.', 'qode'); ?> 
                                </div>
                        <?php endif; // endif have_posts ?>

这是包含在内的CPT模板文件的示例：

<div <?php post_class('vc_span4 wpb_column column_container'); ?> style="padding-bottom: 60px;">

<div class="wpb_wrapper book">

    <?php // Get the post thumbnail ?>
    <div class="wpb_single_image wpb_content_element element_from_fade element_from_fade_on">
        <div class="wpb_wrapper">
            <?php 
                if ( has_post_thumbnail() ) {
                    echo '<a href="' . get_permalink( $thumbnail->ID ) . '" title="' . the_title_attribute( 'echo=0' ) . '" class="book-holder" ><span class="book-thumb">';
                    echo get_the_post_thumbnail( $post->ID, 'book-thumbnail' ); 
                    echo '</span></a>';
                }
            ?>
        </div> 
    </div>

</div>

<div class="wpb_text_column wpb_content_element text-align-center" style="margin: 20px 0px 0px 0px; ">

    <div class="wpb_wrapper">
        <h5><?php the_title(); ?></h5>
    </div>
    <a href="<?php the_permalink(); ?>" target="_blank" class="qbutton  small" style="margin: 20px 0px 0px 0px; "><?php _e('More Info', 'qode'); ?></a>

</div>
</div>

我必须在这里做错事，但我无法弄清楚是什么。有人可以帮助我吗？