I was pretty sure of this, but the answer is—at least for now—a definitive no. There isn’t an API call for it. To double-check, I asked core developer Andrew Nacin about this on Twitter. His response: term_taxonomy_id is, for the moment, essentially private. You should likely never have it to use it. It might be … Read more
There is no concept of “primary” term in WordPress. Taxonomies are grouping mechanism. Post belongs to multiple terms on equal terms (no pun intended). No term is “more” of a group than the rest. From brief description of your use case, intuitively Artists would be much better defined as CPT too. But then it comes … Read more
wp_set_post_terms() uses wp_set_object_terms(). There is an action hook called set_object_terms which fires on successful setting of an object’s terms. The action hook looks like this do_action ( ‘set_object_terms’, int $object_id, array $terms, array $tt_ids, string $taxonomy, bool $append, array $old_tt_ids ) What we can do here is, inside our action callback function, we can check … Read more
We can filter the generated SQL query through the terms_clauses filter before the SQL query is executed. What we will be doing is to introduce a new parameter called wpse_parents which will accept an array of parent term ID’s to get children from. Note, this new parameter works exactly the same as the build-in parameter, … Read more
The wp_list_categories() function calls the get_categories() function, that’s a wrapper for the get_terms() function, that creates an instance of the WP_Term_Query class. It doesn’t look like it supports ordering by term order. If the plugin uses the term_order column in the wp_terms table, then you can try to add a support for it’s ordering, via … Read more
With saving child terms, I believe you can add them to the $term_array group where the parent lives. From the perspective of a post (or custom post type) saving the taxonomy has nothing to do with parent or child. The WP Codex states “For hierarchical terms (such as categories), you must always pass the id … Read more
I’ve done something like this in the Query Multiple Taxonomies plugin: https://github.com/scribu/wp-query-multiple-taxonomies/blob/master/core.php The good news is that it’s a generic solution: it works for any combination of posts and taxonomies. The bad news is that it might take some effort to figure out how it’s done.
I’m not really up to date on WPML and how it handles translations, but my general understanding is that in most cases it simply creates duplicate entries for each language and links them together with the “original”. However, I recently hade a similar problem where I needed the ability to add a “pluralized” version of … Read more
I agree with you, it’s somewhat an unexpected user experience, when you’re redirected after updating a term. Additionally there seems to be no error handling on the form itself, if you try to make some errors, like deleting the term name and slug, it will not show any errors, just ignore your changes and redirect. … Read more
I doubt it would justify the effort of writing custom SQL queries for only 2500 posts. Within the wp_set_object_terms( $object_id, … ) function we have: $object_id = (int) $object_id; so it’s correct that it only takes a single post id as input. So you would need to loop over your $post_ids array but it might … Read more