Custom post type is a great way to customize your WordPress and adding new taxonomies makes it even more powerful. All functionality comes with WordPress core but it can be difficult to specific posts on a custom taxonomy. The key in this is the new tax_query argument.
It’s a new argument that replaces “tax” in the old query arguments. Which is now deprecated. You send as an array and you can include different taxonomies or exclude them.
- taxonomy (string) – Taxonomy
- field (string) – Select taxonomy term by (‘id’ or ‘slug’)
- terms (int/string/array) – Taxonomy term(s).
- include_children (boolean) – Whether or not to include children for hierarchical taxonomies. Defaults to true.
- operator (string) – Operator to test. Possible values are ‘IN’, ‘NOT IN’, ‘AND’.
Get all post on a taxonomy slug
I’d assume we have a custom post type, let’s call it “book”, and a custom taxonomy called “book-type”.
To get all books that has the “book-type” “fantasy” see example below
$args = array( 'post_type' => 'book', 'showposts' => -1, 'tax_query' => array( array( 'taxonomy' => 'book-type', 'field' => 'slug', 'terms' => 'fantasy' ) ), 'orderby' => 'title', 'order' => 'ASC' ); $books = get_posts($args);
If we want all books that are fantasy and horror
'terms' => array('fantasy', 'horror')
Read more on WordPress Codex about WP_Query, click here
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