Define menu_order on Creation of New Custom Post?

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I've created a custom post type called video and I'm using a plugin called Playlist_Order (which changes the menu_order field) to allow the user to use a drag and drop interface to order their videos in a playlist.

However, when adding a new post the video appears at the top of the playlist because it's given a default menu_order value of 0.

On creation of a new video post I would like it to appear last in the playlist - i.e. query all video post types, find the largest menu_order value and then set this +1 for the new post.

How can I implement this?

I've created a custom post type called video and I'm using a plugin called Playlist_Order (which changes the menu_order field) to allow the user to use a drag and drop interface to order their videos in a playlist.

However, when adding a new post the video appears at the top of the playlist because it's given a default menu_order value of 0.

On creation of a new video post I would like it to appear last in the playlist - i.e. query all video post types, find the largest menu_order value and then set this +1 for the new post.

How can I implement this?

• custom-post-types

Share Improve this question edited Sep 29, 2010 at 1:00 MikeSchinkel 37.5k1414 gold badges116116 silver badges132132 bronze badges asked Sep 29, 2010 at 0:41 fxfuturefxfuture 1,33744 gold badges2424 silver badges4040 bronze badges

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3 Answers 3

Sorted by: Reset to default 7

Hi @fxfuture:

I think what you are looking for is the wp_insert_post_data hook. You can add this code to the bottom of your theme's functions.php file and/or you can add it to a plugin:

add_filter('wp_insert_post_data','my_wp_insert_post_data',10,2);
function my_wp_insert_post_data($data, $postarr) {
  $post_type = 'video';
  if ($data['post_type']==$post_type && get_post($postarr['ID'])->post_status=='draft') {
    global $wpdb;
    $data['menu_order'] = $wpdb->get_var("SELECT MAX(menu_order)+1 AS menu_order FROM {$wpdb->posts} WHERE post_type='{$post_type}'");
  }
  return $data;
}

the 10 & 2 arguments in the end of the add_filter method are: the priority of the execution (optional default=10) and number of arguments the new function receives (optional default=1)

the only reason it appears in the code above it's to change the default number of argument.

read more here http://codex.wordpress.org/Function_Reference/add_filter

Updated the answer as the post_status draft gave a notice. Instead, I'm checking for a zero (unchanged) menu order and giving it a unique menu order (highest in database + 5). Adjust to your needs.

add_filter( 'wp_insert_post_data', 'mp_wp_insert_post_data' );
function mp_wp_insert_post_data( $data ) {
    $post_type = 'page';
    if ( $post_type === $data['post_type'] && 0 === $data['menu_order'] ) {
        global $wpdb;
        $data['menu_order'] = $wpdb->get_var( "SELECT MAX(menu_order)+5 AS menu_order FROM {$wpdb->posts} WHERE post_type='{$post_type}'" );
    }
    return $data;
}

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