Duplicate posts created when a post exists with the same post_title but different post_type

[StaymanHou]

Duplicate posts created when a post exists with the same post_title but different post_type

How to reproduce

Import an xml file containing a post with title Example but without post_date specified Create another post with the same title Example but with a different custom post_type, for example news Import that same xml file again. And it will create a new post with the same title instead of treating it as existing post.

Possible solution

Filter the post_type in $post_exists = post_exists( $post['post_title'], '', $post['post_date'] ); instead of checking the post_type later in if ( $post_exists && get_post_type( $post_exists ) == $post['post_type'] ) {

https://github.com/WordPress/wordpress-importer/blob/449e2d3cbd54749c51cb896d411daa9bef14ae88/src/class-wp-import.php#L659 https://github.com/WordPress/wordpress-importer/blob/449e2d3cbd54749c51cb896d411daa9bef14ae88/src/class-wp-import.php#L675

Additional note

This is probably a corner case; And I'm sort of abusing this plugin. So we are using the importer to continuously synchronizing the data from another system. And sometimes existing data gets synced across the systems. post_date is irrelevant to that post type so it's always empty. Otherwise, it would have prevented this issue. Meanwhile, other type of posts are continuously being published by writers, and may sometimes have the same title.

I'm just not sure if there's any particular reason why we are not filtering the post_type in the post_exists call. Maybe for backward compatibility?

If not, I could work on a PR to update this.