Wordpress 独特的复选框

Question

我在 post 中创建了一个由复选框处理的自定义字段 "headline"。现在我希望当 post 被保存并且复选框被选中时，所有 "headline" 复选框在其他 post 中被清空。如果这一切正常，应该只有另一个 post 选中了该复选框。

function createHeadlineField()
{
$post_id = get_the_ID();

if (get_post_type($post_id) != 'post') {
    return;
}

$value = get_post_meta($post_id, '_headline_field', true);
wp_nonce_field('headline_nonce_'.$post_id, 'headline_nonce');
?>
<div class="misc-pub-section misc-pub-section-last">
    <label><input type="checkbox" value="1" <?php checked($value, true, true); ?> name="_headline_field" /><?php _e('This post is the top Story', 'pmg'); ?></label>
</div>
<?php
}

function saveHeadlineField($post_id)
{
   if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
    return;
}

if (
    !isset($_POST['headline_nonce']) ||
    !wp_verify_nonce($_POST['headline_nonce'], 'headline_nonce_'.$post_id)
) {
    return;
}

if (!current_user_can('edit_post', $post_id)) {
    return;
}
if (isset($_POST['_headline_field'])) {
    update_post_meta($post_id, '_headline_field', $_POST['_headline_field']);
} else {
    delete_post_meta($post_id, '_headline_field');
}

}

有人知道怎么做吗？我想我必须在 post 中查询具有 _headline_field 值的 post 并在更新实际 post.

之前删除它们

感谢

Answer 1

所以如果你想查询带有元键标题的帖子，你可以这样做：

$posts = array();
$query =  new WP_Query(array('meta_key' => Headline, 'meta_value'=>YOURVALUE, 'posts_per_page' => LIMIT (-1 for endless)))
if ($query->have_posts()) {
    while ($query->have_posts()) {
        $query->the_post();
        $posts[] = $query->post;
    }
    wp_reset_postdata();
}
return $posts;

Answer 2

我试过这样做：

if (isset($_POST['_headline_field'])) {

    //query posts with custom field selected

    $args = array ( 'meta_key' => '_headline_field', 'meta_value' => '1', LIMIT -1 );


    $headline_query = new WP_Query( $args );
    if ( have_posts() ):
        while ( have_posts() ) :
            $headline_query->the_post();
            $headline_query->delete_post_meta(get_the_ID(), '_headline_field');
        endwhile;
    endif;

    update_post_meta($post_id, '_headline_field', $_POST['_headline_field']);

Answer 3

好的，找到解决方案了。

在将新值写入数据库之前，我刚刚使用 "delete_post_meta_by_key()" 函数用键 _headline_field 擦除所有 post 元数据。

if (isset($_POST['_headline_field'])) {

    delete_post_meta_by_key( '_headline_field' );
    update_post_meta($post_id, '_headline_field', $_POST['_headline_field']);
}

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