Bidirectional related fields between posts are not working correctly

Hello,

Thanks for the feedback!

I just tested it, and the bidirectional works fine here. Have you tried to remove the “S220” from the “4.90% APR fixed rate” relationship, save the post, re-add it and save the post again?

Also can you try to add an another item, just to make sure you don’t have specific rules that would disallow the field update on that post?

You could also try to add an item directly from the “S220” post, and make sure the relationship is correctly added from there.

Thanks in advance,

Regards.

Hello,

Well now that makes sense, yes. The Bidirectional Setting use native ACF hooks acf/update_value in order to establish the bidirectional values.

When using a third-party plugin to duplicate a post, it will most likely use native WordPress functions like add_post_meta(), to add metadata that were set in the original post. Those native WordPress functions bypass the ACF logic, and thus never trigger ACF Extended Bidirectional saving process.

Unfortunately there’s not many solutions here, apart from running a script that will force to re-update meta values (and trigger the bidirectional logic), like explained in the Bidirectional Setting documentation.

Note that saving the new post manually from the WordPress admin will not trigger the update process if no values were changed. In fact, the Bidirectional Setting has been designed to be only save changes, when a new value has been added or when a previously set value has been removed, to optimize performance and avoid saving again and again multiple values everytime the admin save a post.

If you prefer force the update from the admin, then you have to edit your new post, remove all values in the Relationship field, save the post, re-add new values and save the post again.

Hope it helps!

Regards.

Hello,

To clarify:

1. The “script” code snippet provided in the documentation will loop through all pages in the database and force the update of a specific bidirectional field (in the example, the field is named my_field). This script should be run only once, and removed when all posts are correctly updated.

2. Instead of the “script” solution, an another way to update the values is to manually trigger the save from the Admin UI. I forgot to mention in my previous answer that there is a much simpler way to achieve that from the Admin UI.

Instead of “remove values, save the post, re-add values, re-save the post…”, you can simply add this code in your theme’s functions.php file:

add_filter('acfe/bidirectional/force_update', '__return_true');

Then head over your duplicated post, and simply save the post. It will force the update of all bidirectional fields within that post.

Once all your posts are correctly updated, you can then remove that code from your functions.php file to increase performance of normal saving process.

I took the opportunity to update the documentation to add more details, and explain a little more these two solution. I hope it’s now more clear.

Lastly, does this situation affect other ACF fields other than bi-directional relationship fields?

I’ll try to not be too technical, but in theory, the problem of using a “Duplicate Post plugin which use native WordPress function instead of ACF update function” affect any ACF field that has a non-classical behavior outside of saving a metadata when updated (within the acf/update_value hook).

The bidirectional setting is an edge-case tho, since 99% of ACF fields will simply update their own metadata (and not other posts), which is fine when using a Duplicate Post plugin that copy existing metadata.

Hope it helps!

Have a nice day!

Regards.