I have a category called "best post". When the editor selects this category in a post and publishes the page, a PHP routine must check if other posts have this category, and if so, this category must be deleted from all posts except the current page...
I have a category called "best post". When the editor selects this category in a post and publishes the page, a PHP routine must check if other posts have this category, and if so, this category must be deleted from all posts except the current page...
Share Improve this question asked Feb 12, 2019 at 15:26 frenchman100frenchman100 153 bronze badges1 Answer
Reset to default 3After the post save (using save_post hook) you check if the saved post has your "unique" category, and if so remove the category from the other posts, keeping the one you just saved.
add_action( 'save_post', 'set_post_unique_category', 10,3 );
function set_post_unique_category( $post_id, $savedPost, $update ) {
// Only set for post_type = post
if ( 'post' !== $savedPost->post_type ) {
return;
}
// Check if post has your desired category
if ( ! has_category('best-post', $savedPost) ){ //use your category slug
return;
}
// Get the best-post category term by its slug
$term = get_term_by( 'slug', 'best-post', 'category' );
//Now let's find the other posts with your category
$args = array( 'category' => $term->term_id, 'post_type' => 'post' ); //set the arguments for the query
$postsList = get_posts( $args );
foreach ($postsList as $post) { //Remove the category from the found posts
if ($post->ID == $post_id ) //but skip the just saved post
continue;
wp_remove_object_terms( $post->ID, 'best-post', 'category' );
}
}
I haven't tested it so you could encounter syntax errors or wrong property names, but the logic should be fine, at least to get you an idea of what you should do. A good google search plus a wordpress codex stroll are always your friends ;)