How to display news of a specific tag on a page?

Question

metadata

There is a BMW page, where there is a description of the logo and dt, and I want to display the news there, by the BMW tag.
To choose which label on which page I decided to use Advanced Custom Fields, I got the following code

<?php
          $term = the_field('btag');
          $query = new WP_Query("tag_id=$term");
          ?>
            <?php if ($query->have_posts()) : ?>
            <?php while ($query->have_posts()) : $query->the_post(); ?>
              <?php if ( get_field('s_img') ) { 
                include "block/sshortnews.php";
              } 
              else {
                include "block/shortnews.php";
              }
              ?>
            <?php endwhile; /* rewind or continue if all posts have been fetched */ ?>
             <div class="wp-pagenavi"><?php if (function_exists('wp_corenavi')) wp_corenavi(); ?></div>
            <?php else : ?>
            <?php endif; ?>

It turns out that

29 is the id of the tag
How to do it right?

Answer 1

/* Если используем слаг-ярлык тэга */
<?php
$post_tag = 'BMW';
$the_query = new WP_Query( 'tag='.$post_tag );

if ( $the_query->have_posts() ) {
    echo '<ul>';
    while ( $the_query->have_posts() ) {
        $the_query->the_post();
        echo '<li>' . get_the_title() . '</li>';
    }
    echo '</ul>';
} else {
    // постов нет
}

/* Сбрасываем значение переменной $post до стандартного */
wp_reset_postdata();

/* Если используем ID тэга */

<?php
$post_tag = 29;
$the_query = new WP_Query( 'tag='.$post_tag );

if ( $the_query->have_posts() ) {
    echo '<ul>';
    while ( $the_query->have_posts() ) {
        $the_query->the_post();
        echo '<li>' . get_the_title() . '</li>';
    }
    echo '</ul>';
} else {
    // постов нет
}

/* Сбрасываем значение переменной $post до стандартного */
wp_reset_postdata();