Automatically add a tag according to custom metadata

3 comments

1. I accidentally found this question searching for something similar, and I liked your approach, so I improved your code a bit.

   1. I updated the action hook so it’s being triggered on save AND update.
   2. Added the wp_remove_object_terms to be able to switch back ( toggle ) custom meta box value ( in this case check-box value ).

   function works fine with both, regular and custom post types, also can be used with tags, categories or custom taxonomies too.

   function set_term( $post_id, $your_term ){
   
       $post_id = get_the_ID();
   
       $your_term = get_post_meta( $post_id, 'your_custom_meta_id', true ); 
   
       // check the custom meta-box checkbox value
       if ( $your_term == '1' ) {
           // Create a new term if checked
           wp_set_object_terms( $post_id, 'YourTerm', 'your_custom_taxonomy', true );
       } else {
           // Remove the created term if unchecked
           wp_remove_object_terms( $post_id, 'YourTerm', 'your_custom_taxonomy' );
       }
   }
   
   add_action( 'save_post', 'set_term', 10, 3 );
   

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2. 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?

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3. 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

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