wp_insert_post or wp_set_post_terms do not save taxonomy, but wp_set_post_terms does

Question

I have a litlle problem. I have a custom taxonomy 'rodzaj' with value i.ex. obrazek. I use this code to add post:

$postArray = array(
                'post_status' => 'publish',
                'post_author'=> get_current_user_id(),
                'post_category'=>array($catId),
                'post_title' => $_POST['titlePhoto'],
                'tax_input' => array( 'rodzaj' => array( 'obrazek') ) , 
);

This code adds a post but without taxonomy. I tried also this:

wp_set_object_terms($postId, "obrazek", 'rodzaj', false);

Doesn't work too.

Working code is:

wp_set_post_terms( $postId, array( 'obrazek'), 'rodzaj' );

Why first 2 functions doesn't work?

I made mistake at the begining. This is full working code:

$catId = get_cat_ID("Obrazki");

         $postArray = array(
            'post_status' => 'publish',
            'post_author'=> get_current_user_id(),
            'post_category'=>array($catId),
            'post_title' => $_POST['titlePhoto'],
            'tags_input' => explode(',', $_POST['tagsPhoto'])
         );


         $postId = wp_insert_post($postArray);
         if($postId) 
         {
              wp_set_object_terms($postId, "obrazek", 'rodzaj', false);

          }

Still doesn't working: wp_set_post_terms($postId, "obrazek", 'rodzaj', false);

and 'tax_input' => array( 'rodzaj' => array( 'obrazek') ) in postArray()

Answer 1

Have you tried:

wp_set_object_terms( $postId, array( 'obrazek'), 'rodzaj' );

wp_set_object_terms and wp_set_post_terms take the same arguments. wp_set_post_terms even uses wp_set_object_terms internally. The main difference being that you used an array in the one that worked, and you didn't use an array in the one that didn't work.