I am developing a site with WPML and ACFML on WP Engine, and have an ACF image / relationship field on a category, set to 'Same fields across languages'.
I edit the category in English, upload an image, and select some posts. These display correctly for English on the front-end.
If I visit the admin page for a French translation, the image and relationship field are blank. They also do not show up on the front-end.
I then go into the WP Engine page in the backend, and click Clear All Caches.
Now when I revisit the admin page, or the front-end, the fields show up correctly for the French version.
It appears WPML is not correcting clearing term caches for translated languages when a term is saved.
Languages: English (English )German (Deutsch )French (Français )
Timezone: Europe/Zagreb (GMT+01:00)
Hi,
Thank you for contacting WPML support!
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On this sandbox, can you try reproducing this issue with one simple field/page? And if you see the issue, can you record a video using tool such as hidden link to show it?
If it doesn't happen here and is only related to WP Engine caching, could you provide us with a staging site where we could check this issue ourselves? But having hidden link video would also help us to understand the issue completely.
Apologies for the delay - have been isolating the problem as much as possible.
It can't be replicated on your staging site since you don't have object caching enabled.
Here is a video of what happens on a brand new install on WP Engine (I could share access, but hopefully unnecessary based on my video / description below):
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- I create a category, and translate it to French.
- I edit the category in English - you see the first bug; no translation shows up in the box, because it has old term meta cached. I clear the object cache, and now I see the French version linked.
- I edit a relationship ACF field (any field that gets copied works), and view the French version. The data hasn't copied over, because it has old term meta cached. I clear the object cache again, and now you see the relationship field with data added.
It appears all of this comes down to the fact you are performing direct SQL queries (in this case in the sync_custom_field function in the WPML_Sync_Term_Meta_Action class) - after that there's a line that calls wp_cache_init, but the term cache is never actually cleared, so everything breaks on sites like WP Engine which use a persistent object cache. May not just be term caches too, not sure what else is affected if there is similar code elsewhere.
I tried disabling wp_cache_set in class-wpml-cache-terms-per-lang.php, and flushed the cache, but the problem still exists, so that's not the cause / solution.
Note that I can replicate a similar issue that doesn't rely on the ACFML / ACF plugin at all - still requires WP Engine caching:
- load the admin page for both an English category
- open the admin page for French translation of the category in a new tab
- go back to the first tab, without refreshing the page, click 'Update' - it will say 'category not updated'.
Debugging shows that when the wp_update_term function tests for a duplicate slug, it calls get_term_by('slug','english-slug','category'), but the bad cache generated by the second tab load will return the french term, which has a different slug, throwing an error.
Languages: English (English )German (Deutsch )French (Français )
Timezone: Europe/Zagreb (GMT+01:00)
Hi,
We tested with WP LiteSpeed plugin + Memcached (enabled the wp-admin caching) and Redis Object Cache plugin + Redis caching, but we can't replicate the issue. It works fine with both object caching.
Can you provide us WP Engine staging site with caching enabled where we can see this?
