WordPressで投稿日: 公開する際に自動的にカスタムフィールドを追加する方法

16件のコメントLeave a Reply

1. Sateesh Raghuwanshi

   I need to add this action for custom post type named ‘ad_system’

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2. nayan

   I want to add category Id for the post in the post_meta table. How can be the function function add_custom_field_automatically($post_ID) be twicked to accomodate that?

   Thanks

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3. chris

   Instead of adding the custom field at the time of creating the post, how do I display a custom field by default on the admin page?

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4. puanthanh

   it’s not adding to custom post type

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   • Editorial Staff

     If you notice, the code above doesn’t have anything related to the custom post types. It only adds to Post and Page “content type”. So you would have to specify the hook for your custom post type.

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     Admin

     • puanthanh

       Thanks for the reply. Can you help me out on this code.
       add_action(‘publish_page’, ‘add_custom_field_automatically’);
       add_action(‘publish_post’, ‘add_custom_field_automatically’);
       add_action( ‘save_post’, ‘add_custom_field_automatically’ );

       function add_custom_field_automatically($post_ID) {
       global $post;
       if(!wp_is_post_revision($post_ID)) {
       global $wpdb;
       $user_id = $wpdb->get_var("SELECT post_author FROM $wpdb->posts WHERE ID = $post_ID");
       $themename = $wpdb->get_var("SELECT meta_value FROM $wpdb->usermeta WHERE meta_key = ‘themeperauthor’ AND user_id = $user_id");
       add_post_meta($post_ID, ‘themeperauthor’, $themename, true);
       }
       }
       When the user meta field is changed, I want to automatically delete the custom field value and update with the new one

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5. brian

   I’ve been working on adding some hidden custom fields on post publish/update (by preceding the field name with “_”) but for some reason I have to update the post twice before the wp_postmeta entries are written to the database.

   I’ve tried messing with the priority and experimenting with other action hooks (draft_to_publish, edit_post, etc) but it doesn’t seem to make a difference.

   Any ideas?

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   • Editorial Staff

     are you using Otto’s trick with the transient API?

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     Admin

6. Boba

   Thanks for including the source link

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   • Editorial Staff

     Thanks for providing an amazing tip

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     Admin

7. Daniel Suarez

   Thanks Otto another great tip!

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8. Piet

   will this work too for custom post types?
   sth like add_action(‘publish_custom-post-typ-name’, ‘add_custom_field_automatically’);

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   • Otto

     Yes, it will.

     One downside to this technique that people should be aware of is that if somebody edits a published post, this hook WILL get fired again on the edit. Therefore, you need to check for the meta before adding it, or to update it, or to do whatever makes the most sense for your use-case.

     If you only want to get your code fired off on the initial publish only, then you can use the transition_post_status hook. This hook works like this:

     
add_action('transition_post_status','example',10,3);
function example($new, $old, $post) {
// $new is the new post status ('publish')
// $old is the old post status ('draft')
// $post is the complete Post Object (so use $post->ID for the ID, etc)
}


     Then, in here you can do a check for something like this:
     
if ($new == 'publish' && $old != 'publish')


     To have your code only used when the post status actually transitions to publish from whatever it was before. This hook is fired at the same time as the {$status}_{$post-type} hooks are, so the operation of them is basically the same.

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     • Piet

       Thanks Otto, will play around with that a bit!

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     • Editorial Staff

       Thanks Otto for the clarification.

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       Admin

9. Vivek Parmar

   thanks for this handy tip. previously while using custom fields i have to work manually. now this will do it automatically. thanks for saving precious time of me

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