WP 如何在一个类别的管理面板中显示一个包含该类别所有已分配帖子列表的字段？

Question

Please tell me how to display a list of posts to which the same category is assigned in the WordPress admin part of a custom category? I used this code, but it's work wrong

// Show posts for some vendor
add_action('admin_init', 'vendors_custom_fields', 1);
function vendors_custom_fields() {
    add_action('vendors_edit_form_fields', 'category_custom_fields_form');
}

function category_custom_fields_form($tag) {?>

    <tr class="form-field">
        <th scope="row">Companies with current manufacturer:</th>
        <td>
            <?php
            $t_id = $tag->term_id;
            $cat_meta = get_option("category_$t_id");
            
            
            $args = array(
                'cat' => $t_id,  
            );

            $query = new WP_Query( $args );
            if ( $query->have_posts() ) : ?>

            <?php while ( $query->have_posts() ) : $query->the_post(); ?>
                    <p><?php echo get_the_title() ?></p>
                <?php endwhile; ?>
                <?php wp_reset_postdata(); ?>

            <?php else : ?>
                <p><?php esc_html_e( 'This manufacturer has no designated companies' ); ?></p>
            <?php endif; ?>
        </td>
    </tr>
    <?php
}

Answer 1

Right answer

// Show posts for some vendor
add_action('admin_init', 'vendors_custom_fields', 1);
function vendors_custom_fields() {
    add_action('vendors_edit_form_fields', 'category_custom_fields_form');
}

function category_custom_fields_form($tag) {?>

    <tr class="form-field">
        <th scope="row">Companies with current manufacturer:</th>
        <td>
            <?php
            $t_id = $tag->term_id;
            $cat_meta = get_option("category_$t_id");
            
            
            $args = [
                'tax_query' => [
                    [
                        'taxonomy' => $tag->taxonomy,
                        'terms' => $t_id,
                    ],
                ],
            ];

            $query = new WP_Query( $args );
            if ( $query->have_posts() ) : ?>

            <?php while ( $query->have_posts() ) : $query->the_post(); ?>
                    <span><?php echo get_the_title() ?></span><span> | </span>
                <?php endwhile; ?>
                <?php wp_reset_postdata(); ?>

            <?php else : ?>
                <p><?php esc_html_e( 'This manufacturer has no designated companies' ); ?></p>
            <?php endif; ?>
        </td>
    </tr>
    <?php
}