Automatically add a tag according to custom metadata

Question

I'm trying to figure out how to make a function to automatically add a "featured" tag to a post, based on a checkbox in a metabox I've added to the edit screen.

I think the function I need to use is wp_set_object_terms, but I don't get how it works. I know how to check if those checkboxes are active or not, but that´s all.

I hope someone can put me on the right track with this.

Answer 1

Ok, found the problem.

This code works like a charm:

function is_featured_post(){
$postid = get_the_ID();
$featured = get_post_meta($postid, 'wpcf-slider-if', true); if ( $featured == 1 ) { 
    wp_set_object_terms( $postid, 'Destacado', 'post_tag', true );
}
}

add_action ( 'publish_post', 'is_featured_post' );

But it only works in standard post, not in custom post types. There is a hook to do the same with custom post types?

Answer 2

You can hook into the action with add_action ( 'publish_post', 'your_function' );

Write a function to check if the checkbox is checked and if so update the posts term

http://codex.wordpress.org/Plugin_API