The part that works for me from the release notes is:
Core: Fixed bug when adding ‘post_parent’ value to post_object/relationship query args
It’s not a front-end admin feature. You need to use a filter in your functions to alter the query:
http://www.advancedcustomfields.com/resources/acf-fields-relationship-query/
Huzzah!
Appears ACF Pro version 5.1.6 fixed this issue. At least in my use case.
Cheers developer.
Trying to do the same thing, showing only child pages of a parent in a relationship field. Other query args I tried work fine, but setting post_parent
shows only a “(no title) ()” in the list, though the child pages do show when I use the search field.
Also, several of these errors logged each time the page with the field loads:
PHP Notice: Trying to get property of non-object in /Users/.../wp-content/plugins/advanced-custom-fields-pro/api/api-helpers.php on line 1709
Seems like a bug.