WooCommerce 제품 카테고리 설정에서 추천 게시물에 대한 다중 선택 필드 추가

사용자가 각 woocommerce 제품 카테고리에 대한 사용자 지정 게시물 또는 게시물 목록을 선택할 수있는 간단한 플러그인을 만들고 있습니다. select2게시물 목록 선택에 사용 하고 있습니다. 왜 저장되지 않습니까? 필드에 대한 데이터를 저장하지 못했습니다.

<?php 
if ( ! defined( 'ABSPATH' ) ) {  exit;  }

/*----------------------------------------------------------------------
Adding Ajax Search for POSTS
-------------------------------------------------------------------------*/
function ex_get_posts_ajax_callback(){
 global $post;
    // we will pass post IDs and titles to this array
    $return = array();

    // you can use WP_Query, query_posts() or get_posts() here - it doesn't matter
    $search_results = new WP_Query( array( 
        's'=> $_GET['q'], // the search query
        'post_type' => 'post',//post type
        'post_status' => 'publish', // if you don't want drafts to be returned
        'ignore_sticky_posts' => 1,
        'posts_per_page' => 20 // how much to show at once
    ) );
    if( $search_results->have_posts() ) :
        while( $search_results->have_posts() ) : $search_results->the_post();   
            // shorten the title a little
            $title = ( mb_strlen( $search_results->post->post_title ) > 50 ) ? mb_substr( $search_results->post->post_title, 0, 49 ) . '...' : $search_results->post->post_title;
            $return[] = array( $search_results->post->ID, $title ); // array( Post ID, Post Title )
        endwhile;
    endif;
    wp_send_json( $return );
}
add_action( 'wp_ajax_getpostsearch', 'ex_get_posts_ajax_callback' ); // wp_ajax_{action}




//html output for edit field
function ex_product_cat_feature_posts($post_object) {
    global $post;
    // Nonce field to validate form request came from current site
    wp_nonce_field( basename( __FILE__ ), '_feature_post_nonce' );

    $html = '';

    // always array because we have added [] to our <select> name attribute
    $ex_product_cat_feature_post = get_post_meta( $post_object->ID, 'ex_product_cat_feature_post', true );

    $html .= '<tr class="form-field">';
    $html .= '<th scope="row" valign="top"><label for="catshort_button_type">Select Feature post:</label></th>';
    $html .= '<td>';
    $html .= '<select id="ex_product_cat_feature_post" name="ex_product_cat_feature_post[]" multiple="multiple" style="width:99%;max-width:25em;">';

    if( $ex_product_cat_feature_post ) {
        foreach( $ex_product_cat_feature_post as $post_id ) {
            $title = get_the_title( $post_id );
            // if the post title is too long, truncate it and add "..." at the end
            $title = ( mb_strlen( $title ) > 50 ) ? mb_substr( $title, 0, 49 ) . '...' : $title;
            $html .=  '<option value="' . $post_id . '" selected="selected">' . $title . '</option>';
        }
    }
    $html .= '</select>';
    $html .= '</td>';
    $html .= '</tr>';

    echo $html;
    //==========================================
    ?>
    <script>
    (function ($) {
        'use strict';
    $(function () {
        //--------------------------------------------------------------------------
        // multiple select with AJAX search
        $('#ex_product_cat_feature_post').select2({
            ajax: {
                    url: ajaxurl, // AJAX URL is predefined in WordPress admin
                    dataType: 'json',
                    delay: 250, // delay in ms while typing when to perform a AJAX search
                    data: function (params) {
                        return {
                            q: params.term, // search query
                            action: 'getpostsearch' // AJAX action for admin-ajax.php
                        };
                    },
                    processResults: function( data ) {
                    var options = [];
                    if ( data ) {

                        // data is the array of arrays, and each of them contains ID and the Label of the option
                        $.each( data, function( index, text ) { // do not forget that "index" is just auto incremented value
                            options.push( { id: text[0], text: text[1]  } );
                        });

                    }
                    return {
                        results: options
                    };
                },
                cache: true
            },
            minimumInputLength: 3 // the minimum of symbols to input before perform a search
        });

        //----------------------------------------------------------------------------------------
    });
})(jQuery);
</script>   
<style type="text/css">
     iframe#description_ifr{
            min-height:220px !important;
     }
</style>
    <?php 
}

add_action('product_cat_add_form_fields', 'ex_product_cat_feature_posts', 10, 1);
add_action('product_cat_edit_form_fields', 'ex_product_cat_feature_posts', 10, 1);


// Save extra taxonomy fields callback function.
function ex_product_cat_feature_posts_save($term_id) {
    $ex_product_cat_feature_post     = filter_input(INPUT_POST, 'ex_product_cat_feature_post');

    update_term_meta($term_id, 'ex_product_cat_feature_post', $ex_product_cat_feature_post);
}

add_action('edited_product_cat', 'ex_product_cat_feature_posts_save', 10, 1);
add_action('create_product_cat', 'ex_product_cat_feature_posts_save', 10, 1);