How to use wp query posts with current post meta value in text widget

Question

I would like to query information in my sidebar text widget. I added the function. The php query working. (see the code below)

I have single posts with wine tastings. I would like to show in right sidebar which cellar producted it. I added the same custom field key cellar_slug and value somloi-apatsagi-cellar each post. Code below can show the cellar.

But how can I using on all posts? Every post have different meta value. Is there any solution using current post meta value instead of a fix value?

    <?php 

$cellars = new WP_Query(array(
     'post_type' => 'post', 
     'numberposts' => -1, 
    'posts_per_page' => '1',
 'meta_query' => array(
          array(
           'key' => 'cellar_slug',
           'value' => 'somloi-apatsagi-cellar',
          )),
     'orderby' => 'menu_order', 
     'order' => 'ASC'
));


if ($cellars->have_posts()) : ?>

<u1>
     <?php 
     while ($cellars->have_posts()) : 
     $cellars->the_post(); ?>
          <li><h3><a href="<?php the_permalink(); ?>">
               <?php the_title(); ?></a></h3><?php the_post_thumbnail('widget-text-post-thumbnail'); ?><?php the_excerpt(); ?>
        </li>  
     <?php endwhile; ?>
</u1>
<?php endif; ?>

Answer 1

Your question is a bit hard to read, but if I understand you on a single post page this should work:

$obj = get_queried_object();

if ('WP_Post' === get_class($obj)) {
  $cellar = get_post_meta($obj->ID,'cellar_slug',true);
  if (!empty($cellar)) {
    $cellars = new WP_Query(
      array(
        'post_type' => 'post', 
        'numberposts' => -1, 
        'posts_per_page' => '1',
        'meta_query' => array(
        array(
          'key' => 'cellar_slug',
          'value' => $cellar,
        )
      ),
      'orderby' => 'menu_order', 
      'order' => 'ASC'
      )
    );
  }
}

You are:

1. Using get_queried_object() to grab the main post data
2. Using get_post_meta() to retrieve the cellar associated with the post
3. And running the query only if you have a cellar