Introduction to adding fixed fields to articles in wordpress

This article mainly introduces the introduction of adding fixed fields to articles in wordpress. It has certain reference value. Now I share it with you. Friends in need can refer to it.

Let wordpress add an article data table. Field so that it can be edited on the article editing page and obtained through the rest api.

Example: Add a thumbnail field litpic to the article

First add a field litpic to the article table wp_posts through mysql

Then add the following code after the theme's function.php :

add_action( 'add_meta_boxes', 'myplugin_add_custom_box');
 

add_action( 'save_post', 'myplugin_save_postdata');function myplugin_add_custom_box() {
add_meta_box('myplugin_sectionid',
'设置缩略图', // 可自行修改标题文字
'myplugin_inner_custom_box',
'post');
}function myplugin_inner_custom_box( $post ) {
global $wpdb;
// Use nonce for verification
wp_nonce_field( plugin_basename( __FILE__ ), 
'myplugin_noncename' );
// 获取固定字段litpic的值，用于显示之前保存的值
// 此处wp_posts新添加的字段为litpic，多个用半角逗号隔开
$date = $wpdb->get_row( $wpdb->prepare( "SELECT litpic FROM $wpdb->posts WHERE ID = %d", $post->ID) );
// litpic  字段输入框的HTML代码
echo '图片url ';
echo '';
// 多个字段依此类推
}
function myplugin_save_postdata( $post_id ) {
// verify if this is an auto save routine.
// If it is our form has not been submitted, so we dont want to do anything
if ( defined( ’DOING_AUTOSAVE’ ) && DOING_AUTOSAVE )return;
// verify this came from the our screen and with proper authorization,
// because save_post can be triggered at other times
if ( !wp_verify_nonce( $_POST['myplugin_noncename'], plugin_basename( __FILE__ ) ) )return;
// 权限验证
if ( 'post' == $_POST['post_type'] ) {
if ( !current_user_can( 'edit_post', $post_id ) )return;
}
// 获取编写文章时填写的固定字段的值，多个字段依此类推
$litpic = $_POST['litpic_new_field'];global $wpdb;$wpdb->update( "$wpdb->posts",
// 以下一行代码，多个字段的话参照下面的写法，单引号中是字段名，右边是变量值。半角逗号隔开
array( 'litpic' => $litpic),
array( 'ID' => $post_id ),
// 添加了多少个新字段就写多少个%s，半角逗号隔开
array( '%s'),
array( '%d')
);
}

After adding, the article page will display the input box of litpic field, as shown in the figure:

But at this time the rest api will not output the litpic field.

Open the /wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php file.

Add the following code:

if ( ! empty( $schema['properties']['litpic'] ) ) {            
$data['litpic'] = $post->litpic;
        }

'litpic'        => array(                    
'description' => __( 'A litpic to protect access to the content and excerpt.' ),
                    'type'        => 'string',
                    'context'     => array( 'view', 'edit', 'embed' ),
                ),

$post_type_attributes = array(            'title',
            'editor',
            'author',
            'excerpt',
            'thumbnail',
            'comments',
            'revisions',
            'page-attributes',
            'post-formats',
            'custom-fields',
            'litpic',
        );        $fixed_schemas = array(            'post' => array(                'title',
                'editor',
                'author',
                'excerpt',
                'thumbnail',
                'comments',
                'revisions',
                'post-formats',
                'custom-fields',
                'litpic',
            ),

case 'litpic':                    
$schema['properties']['litpic'] = array(                        
'description' => __( 'The ID for the litpic of the object.' ),
                        'type'        => 'string',
                        'context'     => array( 'view', 'edit', 'embed' ),
                    );                    break;

Now, the rest api can output the litpic field.

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