我有一个名为“博客”的自定义帖子类型。我希望在小部件中显示此自定义帖子类型中选定的帖子数量。但我得到的只是“找不到列表”，如果找不到帖子，那就是else语句。有帖子。怎么了？

My custom post type:

function blog_post_type() {
    $labels = array(
        \'name\' => \'Blog\',
        \'singular_name\' => \'Blog post\',
        \'add_new\' => \'Add new blog post\',
        \'add_new_item\' => \'Add new blog post\',
        \'edit_item\' => \'Edit blog post\',
        \'new_item\' => \'New blog post\',
        \'all_items\' => \'All blog posts\',
        \'view_item\' => \'View blog post\',
        \'search_items\' => \'Search blog posts\',
        \'not_found\' => \'No blog posts found\',
        \'not_found_in_trash\' => \'No blog posts found in trash\',
        \'menu_name\' => \'Blog posts\',
    );

    $args = array(
        \'labels\' => $labels,
        \'public\' => true,
        \'supports\' => array(
            \'title\',
            \'editor\',
            \'author\',
            \'thumbnail\',
            \'excerpt\',
            \'post-formats\' ),
        \'has_archive\' => true,
        \'taxonomies\' => array( \'post-tag\' ),
        \'show_in_menu\' => true,
    );

    register_post_type( \'blog posts\', $args );
}

add_action( \'init\', \'blog_post_type\' );

class Blog_Widget extends WP_Widget {
    function __construct() {
        parent::__construct(
            \'blog_widget\', // base id
            \'Blog Widget\', // Name
            array(
                \'description\'=> __(\'Displays the latest post excerpt\')
            )
        );
    }

    function update($new_instance, $old_instance) {
        $instance = $old_instance;
        $instance[\'title\'] = strip_tags($new_instance[\'title\']);
        $instance[\'numberOfListings\'] = strip_tags($new_instance[\'numberOfListings\']);
        return $instance;
    }

    function form($instance) {
        if($instance) {
            $title = esc_attr($instance[\'title\']);
            $numberOfListings = esc_attr($instance[\'numberOfListings\']);
        }else {
            $title = \'\';
            $numberOfListings = \'\';
        }
        ?>
<p>
  <label for="<?php echo $this->get_field_id(\'title\'); ?>"><?php  _e(\'Title\', \'blog_widget\'); ?> </label>
  <input class="widefat" id="<?php echo $this->get_field_id(\'title\'); ?>" name="<?php echo $this->get_field_name(\'title\'); ?>" type="text" value="<?php echo $title; ?>" />
</p>
<p>
<label for="<?php echo $this->get_field_id(\'numberOfListings\'); ?>"><?php _e(\'Number of Listings:\', \'blog_widget\'); ?> </label>
<select id="<?php echo $this->get_field_id(\'numberOfListings\'); ?>" name="<?php echo $this->get_field_name(\'numberOfListings\'); ?>">
<?php for($x=1; $x<=10; $x++): ?>
<option <?php echo $x == $numberOfListings ? \'selected="selected"\' : \'\'; ?> value="<?php  echo $x; ?>"><?php echo $x; ?> </option>
<?php endfor; ?>
</select>
</p>
<?php 
    }


    function widget($args, $instance) {
        extract( $args ) ;
        $title = apply_filters(\'widget_title\', $instance[\'title\']);
        $numberOfListings  = $instance[\'numberOfListings\'];
        echo $before_widget;
        if($title) {
            echo $before_title . $title . $after_title;
        }
        $this->getBlogExcerpt($numberOfListings);
        echo $after_widget;
    }

    function getBlogExcerpt($numberOfListings) { //html
        global $post;
        add_image_size( \'realty_widget_size\', 85, 45, false );
        $listings = new WP_Query();
        $listings->query(\'post_type=blog&posts_per_page=\' . $numberOfListings );  
        if($listings->found_posts > 0) {
            echo \'<ul class="realty_widget">\';
            while ($listings->have_posts()) {
                $listings->the_post();
                $image = (has_post_thumbnail($post->ID)) ? get_the_post_thumbnail($post->ID, \'realty_widget_size\') : \'<div class="noThumb"></div>\'; 
                $listItem = \'<li>\' . $image; 
                $listItem .= \'<a href="\' . get_permalink() . \'">\';
                $listItem .= get_the_title() . \'</a>\';
                $listItem .= \'<span>Added \' . get_the_date() . \'</span></li>\'; 
                echo $listItem; 
            }
            echo \'</ul>\';
            wp_reset_postdata(); 
        }else{
            echo \'<p style="padding:25px;">No listing found</p>\';
        } 
    }
}