保存自定义 post 元，不保存数据

Question

我创建了一个自定义 post 类型，其中的元数据框日期从和到。

使用add_events_metaboxes

的回调函数创建自定义post类型

function event_list_init(){

    $labels = array(
        'name'                  => _x( 'Events', 'post type general name' ),
        'singular_name'         => _x( 'Event', 'post type singular name' ),
        'menu_name'             => _x( 'Events List', 'admin menu' ),
        'name_admin_bar'        => _x( 'Events List', 'add new on admin bar' ),
        'add_new_item'          => __( 'Add New Event' ),
        'new_item'              => __( 'New Event' ),
        'edit_item'             => __( 'Edit Event' ),
        'view_item'             => __( 'View Event' ),
        'all_items'             => __( 'All Events' ),
        'search_items'          => __( 'Search Events' ),
        'not_found'             => __( 'No Events found.' ),
        'not_found_in_trash'    => __( 'No Events found in Trash.' )
    );

    $args   = array(
        'labels'                => $labels,
        'description'           => __( 'Create Events' ),
        'public'                => true,
        'publicly_queryable'    => true,
        'show_ui'               => true,
        'show_in_menu'          => true,
        'query_var'             => true,
        'rewrite'               => array( 'slug' => 'event' ),
        'capability_type'       => 'post',
        'has_archive'           => true,
        'hierarchical'          => true,
        'menu_position'         => 6,
        'register_meta_box_cb'  => 'add_events_metaboxes',
        'menu_icon'             => 'dashicons-calendar-alt',
        'supports'              => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' )
    );

    register_post_type('events',$args);

}

add_action('init','event_list_init');

这里是回调函数，它实例化一个 class 以创建元数据框并通过操作挂钩 save_post

保存 post 数据

function add_events_metaboxes(){
   new eventsListMetaBox();
}

class eventsListMetaBox{
    /*
     * Constructor that creates the meta box
     */
    public  function  __construct(){
        /**
         * Render and Add form meta box
         */
        add_meta_box('wpt_events_date', 'Events Date', array($this, 'fisa_events_date'), 'events', 'side', 'high');

        /**
         * Save Date from and to as meta key
         */
        add_action('save_post',array($this, 'fisa_events_date_save'),1,2);
    }

    /**
     * Render Form for Events date
     */
    function fisa_events_date() {

        global $post;

        // Add an nonce field so we can check for it later.
        wp_nonce_field( 'events_date_fromto', 'events_datefromto_nonce' );

        // Echo out the field
        echo '<label for="_fisa_date_from">Date From</label>';
        echo '<input id="fisa-event-datefrom" type="text" name="_fisa_date_from"  class="widefat" />';
        echo '<br/><br/>';
        echo '<label for="_fisa_date_to">Date To</label>';
        echo '<input id="fisa-event-dateto" type="text" name="_fisa_date_to" class="widefat" />';

    }

    /**
     * Meta key actual database insertion
     */
    function fisa_events_date_save($post_id){

        /**
         * Check if nonce is not set
         */
//        if (!isset($_POST['events_datefromto_nonce']))
//            return $post_id;
//
//        $nonce = $_POST['events_datefromto_nonce'];
//        /**
//         * Verify that the request came from our screen with the proper authorization
//         */
//        if(!wp_verify_nonce($nonce,'events_date_fromto'))
//            return $post_id;
//
//        //Check the user's permission
//
//        if(!current_user_can('edit_post',$post_id) )
//            return $post_id;

        //Prepare and sanitize the data before saving it
        $events_date =  array(
                            sanitize_text_field( $_POST['_fisa_date_from']),
                            sanitize_text_field($_POST['_fisa_date_to'])
                        );

        update_post_meta($post_id, '_fisa_events_date', $events_date);
    }
}

我的问题是我在 wordpress.Can 的 postmeta table 中看不到 _fisa_events_date 元键任何人请指出我错过了什么或者我应该怎么做才能能够要保存吗？

Answer 1

您依靠 register_meta_box_cb 来显示您的元框并将保存逻辑挂接到 save_post。问题是 Wordpress 仅在需要显示元数据框时运行 register_meta_box_cb（挂钩到 add_meta_boxes） - 即当访问编辑或添加 post 页面时。但是当 Wordpress 保存 posts 时，它不需要显示元数据框，所以 register_meta_box_cb、add_events_metaboxes 和你的 save_post 钩子永远不会被调用。

最简单的解决方案是删除您的 register_meta_box_cb 参数，并将 add_events_metaboxes 函数挂接到 admin_init 事件。

add_action('admin_init', 'add_events_metaboxes');

您可以在 add_action('init', 'event_list_init') 挂钩下执行此操作。

找到要点here。

Answer 2

根据 Wordpress documentation, register_meta_box_cb :

will be called when setting up the meta boxes for the edit form.

也就是too late挂钩到save_post.

所以我建议您单独连接到 functions.php 文件中的 save_post 中：

正在注册post类型

$args   = array(
    ....
    'register_meta_box_cb'  => 'add_events_metaboxes',
    ....
);
register_post_type( 'events', $args );

渲染 metabox

function add_events_metaboxes(){
   new eventsListMetaBox();
}

class eventsListMetaBox{
    public  function  __construct(){
        add_meta_box('wpt_events_date', 'Events Date', array($this, 'fisa_events_date'), 'events', 'side', 'high');
    }

    function fisa_events_date() {
        ...
    }
}

保存 metabox

add_action( 'save_post', 'fisa_events_date_save' );

function fisa_events_date_save(){
    global $post;
    $post_id = $post->ID;

    // Use wp_verify_nonce and other checks to verify everything is right

    $events_date =  array(
                        sanitize_text_field( $_POST['_fisa_date_from']),
                        sanitize_text_field($_POST['_fisa_date_to'])
                    );
    update_post_meta($post_id, '_fisa_events_date', $events_date);
}

请记住，Wordpress 并非旨在完全面向对象运行，因此将其 hooking system 与 OOP 概念一起使用可能会出现问题。

Answer 3

最简单、最灵活的解决方案是使用高级自定义字段。

Answer 4

正如其他答案所揭示的那样，问题是 register_meta_box_cb 回调只会处理以下内容：

Do remove_meta_box() and add_meta_box() calls in the callback.

save_post不在回调中，必须独立。此操作挂钩发生：

whenever a post or page is created or updated, which could be from an import, post/page edit form, xmlrpc, or post by email

当您使用 Class 包装元框创建时，我建议将所有内容包装在其中。
_{PS：检查注释并在 save_post 回调中添加必要的检查。}

<?php
class MyEvents {
    public  function  __construct(){
        add_action( 'init', array( $this, 'init' ) );    
        add_action( 'save_post', array( $this, 'save_post' ), 10, 2 ); // no need to change priority to 1
    }

    public function init(){
        $labels = array(
            'name'                  => _x( 'Events', 'post type general name' ),
            'singular_name'         => _x( 'Event', 'post type singular name' ),
            'menu_name'             => _x( 'Events List', 'admin menu' ),
            'name_admin_bar'        => _x( 'Events List', 'add new on admin bar' ),
            'add_new_item'          => __( 'Add New Event' ),
            'new_item'              => __( 'New Event' ),
            'edit_item'             => __( 'Edit Event' ),
            'view_item'             => __( 'View Event' ),
            'all_items'             => __( 'All Events' ),
            'search_items'          => __( 'Search Events' ),
            'not_found'             => __( 'No Events found.' ),
            'not_found_in_trash'    => __( 'No Events found in Trash.' )
        );
        $args   = array(
            'labels'                => $labels,
            'description'           => __( 'Create Events' ),
            'public'                => true,
            'publicly_queryable'    => true,
            'show_ui'               => true,
            'show_in_menu'          => true,
            'query_var'             => true,
            'rewrite'               => array( 'slug' => 'event' ),
            'capability_type'       => 'post',
            'has_archive'           => true,
            'hierarchical'          => true,
            'menu_position'         => 6,
            'register_meta_box_cb'  => array( $this, 'add_metaboxes' ),
            'menu_icon'             => 'dashicons-calendar-alt',
            'supports'              => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' )
        );
        register_post_type('events',$args);
    }

    public function add_metaboxes() {
        add_meta_box( 'wpt_events_date', 'Events Date', array( $this, 'the_metabox' ), 'events', 'side', 'high' );
    }

    public function the_metabox( $post ) { // No need for "global $post", it's passed as parameter
        wp_nonce_field( 'events_date_fromto', 'events_datefromto_nonce' );
        $dates = get_post_meta( $post->ID, '_fisa_events_date', true);
        $from = $dates ? $dates[0] : false;
        $to = $dates ? $dates[1] : false;
        echo '<label for="_fisa_date_from">Date From</label>';
        printf(
            '<input id="fisa-event-datefrom" type="text" name="_fisa_date_from"  class="widefat" value="%s" />',
            $from ? $from : ''
        );
        echo '';
        echo '<br/><br/>';
        echo '<label for="_fisa_date_to">Date To</label>';
        printf(
            '<input id="fisa-event-dateto" type="text" name="_fisa_date_to"  class="widefat" value="%s" />',
            $to ? $to : ''
        );
    }

    public function save_post( $post_id, $post_object ) { // second parameter has useful info about current post
        /* BRUTE FORCE debug */
        // wp_die( sprintf( '<pre>%s</pre>', print_r( $_POST, true ) ) );

        /**
         * ADD SECURITY AND CONTENT CHECKS, omitted for brevity
         */
        if( !empty( $_POST['_fisa_date_from'] ) ) {
            $events_date =  array(
                                sanitize_text_field( $_POST['_fisa_date_from']),
                                sanitize_text_field($_POST['_fisa_date_to'])
                            );
            update_post_meta($post_id, '_fisa_events_date', $events_date);
        }
    }
}
new MyEvents();

保存自定义 post 元，不保存数据

Save custom post meta, not saving the data

php

wordpress

meta-boxes

custom-post-type