[wp-trac] [WordPress Trac] #64696: Real time collboration effectively disables persistent post caches while anyone edits a post

[WordPress Trac]

#64696: Real time collboration effectively disables persistent post caches while
anyone edits a post
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 Reporter:  peterwilsoncc             |       Owner:  (none)
     Type:  defect (bug)              |      Status:  new
 Priority:  normal                    |   Milestone:  7.0
Component:  Posts, Post Types         |     Version:  trunk
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:  performance
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Comment (by peterwilsoncc):

 Replying to [comment:80 ellatrix]:
 > How would it be a larger change than adding a whole new table? 🤔 I
 quickly tried this locally and I have `113 insertions(+), 14
 deletions(-)`. But I may be missing something. I think the only thing we
 need there is a new `register_post_meta` setting, and some early returns
 in `wp_cache_set_posts_last_changed` and `WP_Meta_Query`. What am I
 missing?


 It would require modifications and extensions to multiple components:

 * Meta API would need to be extended to allow the registration of non-
 queryable, uncached post meta
 * Meta API functions would need to be updated to respect new setting, for
 getting, setting and updating meta
 * Potential cache API changes along with the above
 * Query API would need to trigger errors for developers attempting to
 query via the forbidden meta keys for post, term, user and comment query
 classes
 * `WP_Meta_Query` would need to be updated to exclude the forbidden meta
 keys in any `meta_queries` (not sure how this would work, probably
 altering `meta_query` to nest passed parameter.
 * There's probably other things to consider too

 The new table is also useful if the awareness API is expanded to other
 screens within the dashboard, eg showing how many users are on a
 particular screen.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64696#comment:86>
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