[wp-trac] [WordPress Trac] #14399: get_term_children doesn't call clean_term_cache() if necessary

[WordPress Trac]

#14399: get_term_children doesn't call clean_term_cache() if necessary
--------------------------+-------------------------------------------------
 Reporter:  miradev       |        Owner:                 
     Type:  defect (bug)  |       Status:  reopened       
 Priority:  normal        |    Milestone:  Awaiting Review
Component:  Taxonomy      |      Version:  3.0            
 Severity:  normal        |   Resolution:                 
 Keywords:  needs-patch   |  
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Comment(by miradev):

 @scribu
 4 weeks languishing here, I thought I was just being a numpty :p
 It still doesn't actually work, clean_term_cache() needs to be called
 somewhere other than in the same init hook that the taxonomy is
 registered. At best I get it to work by calling it in a subsequent
 request.

 @hakre
 I posted on the forums, trying to get some feedback:
 http://wordpress.org/support/topic/create-hiearchical-taxonomy-
 terms?replies=1

 I'll copy the complete example here:

 {{{
 add_action( 'init', 'create_user_location_tax', 0 );
 function create_user_location_tax(){
   global $wpdb;
   register_taxonomy( 'location', 'users', array('hierarchical' => true,
 'show_ui' => true, 'query_var' => true, 'label' => __('Where are you')) );

   $dummycountry = 'USA';
   $dummystate   = 'KENTUCKY';
   if( taxonomy_exists('location') ){
     $tax_location_terms = get_terms( 'location',
 'get=all&hide_empty=false');
     if( count($tax_location_terms) < 1 ){
       $tax_country  = wp_insert_term($dummycountry,  'location');
       $parent       = $tax_country['term_id'];
       $tax_state    = wp_insert_term($dummystate, 'location',
 array('parent'=>$parent));
       clean_term_cache(array($parent), 'location'); // Doesn't do
 anything.
     }
   }

   $sql    = "SELECT option_value FROM $wpdb->options WHERE option_name =
 'location_children'";
   $result = $wpdb->get_col($sql);
   error_log('term cache: '.$result[0]);
 }
 }}}

 From there, I am a little lost as to what is happening in the WP guts to
 figure out why it isn't working. My vague feeling was that all the things
 I tried were hitting cached results (for that particular http request).

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Ticket URL: <http://core.trac.wordpress.org/ticket/14399#comment:5>
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