Get custom term meta problem on single post type

Question

I'm trying to display a custom field value added to custom taxonomy on single custom post type. I have articles post type with custom taxonomy called issue. I used the code from Tax-Meta-Class to add custom field "publication date" to that taxonomy. For each issue I added a "publication date" value. To display the publication date of the child issue on each related single article I tried to use this code:

$object_terms = wp_get_object_terms( $post->ID, 'issue', array( 'fields' => 'all' ) );
if ( $object_terms ) {
    foreach ( $object_terms as $term ) {
        if ( $term->parent ) { 
            $t_id .= $term->term_id;
            $res .= get_tax_meta($t_id,'publication_date'); 
        }
    }
    echo $res;  
}

But nothing is displayed. I also tried to use get_term_meta instead of get_tax_meta but got nothing. If I added echo $t_id; It displays the term ID which means that the code can correctly get the term ID but it fails to display the custom field value. Any help please?

Answer 1

Possible solutions:

1. Check if there's a prefix which you setup for the custom field (https://en.bainternet.info/tax-meta-class-faq/#comment-1107)

2. Go to the Tax-meta-class/Tax-meta-class.php file and find the function you're calling and debug the issue:

   // Tax-meta-class.php
   
   public function get_tax_meta($term_id,$key,$multi = false){
       $t_id = (is_object($term_id))? $term_id->term_id: $term_id;
       var_dump ($t_id); // debug this
   
       $m = get_option( 'tax_meta_'.$t_id);
       var_dump ($m); // debug this
   
       if (isset($m[$key])){
            return $m[$key];
       }else{
           return '';
       }
   }
   

3. Check the wp_options table and search the option_name column for the option (the parameter of get_option('tax_meta_foo_bar') above). It's either not there or you're missing the prefix for get_option not to return a value.

Answer 2

Here what I did & finally problem is solved. To make the code work just use get_term_meta and add true to be like this:

    $res .= get_term_meta($t_id,'publication_date',true); 

I hope this will help any one facing such issue. Also, those who use prefix need to add it before the field name as mentioned by P-S