[wp-trac] [WordPress Trac] #55811: OrderBy rand in get_posts stopped working after updating to WordPress 6.0

[WordPress Trac]

#55811: OrderBy rand in get_posts stopped working after updating to WordPress 6.0
-------------------------------------------+---------------------
 Reporter:  itsabhineet                    |       Owner:  (none)
     Type:  defect (bug)                   |      Status:  new
 Priority:  normal                         |   Milestone:  6.0.1
Component:  Posts, Post Types              |     Version:  6.0
 Severity:  major                          |  Resolution:
 Keywords:  needs-patch reporter-feedback  |     Focuses:
-------------------------------------------+---------------------

Comment (by itsabhineet):

 - Full stack trace-

 {{{PHP Fatal error:  Uncaught Error: Object of class stdClass could not be
 converted to string in .../wp-content/object-cache.php:1132\nStack
 trace:\n#0 .../wp-content/object-cache.php(1132): array_combine()\n#1
 .../wp-content/object-cache.php(52): WP_Object_Cache->add_multiple()\n#2
 .../wp-includes/post.php(7362): wp_cache_add_multiple()\n#3 .../wp-
 includes/post.php(7442): update_post_cache()\n#4 .../wp-
 includes/post.php(7856): update_post_caches()\n#5 .../wp-includes/class-
 wp-query.php(3134): _prime_post_caches()\n#6 .../wp-includes/class-wp-
 query.php(3586): WP_Query->get_posts()\n#7 .../wp-includes/post.php(2410):
 WP_Query->query()\n#8 .../wp-content/plugins/...my_plugin_file_01.php:
 get_posts()\n#9 .../wp-includes/template.php(772): require('...')\n#10
 .../wp-includes/template.php(716): load_template()\n#11 .../wp-includes
 /general-template.php(204): locate_template()\n#12 .../wp-
 content/plugins/...my_plugin_file_02.php: get_template_part()\n#13 .../wp-
 content/plugins/...my_plugin_file_02.php:
 My_Plugin_Class->function_01()\n#14 .../wp-includes/rest-api/class-wp-
 rest-server.php(1143): My_Plugin_Class->function_02()\n#15 .../wp-includes
 /rest-api/class-wp-rest-server.php(990):
 WP_REST_Server->respond_to_request()\n#16 .../wp-includes/rest-api/class-
 wp-rest-server.php(414): WP_REST_Server->dispatch()\n#17 .../wp-includes
 /rest-api.php(394): WP_REST_Server->serve_request()\n#18 .../wp-includes
 /class-wp-hook.php(307): rest_api_loaded()\n#19 .../wp-includes/class-wp-
 hook.php(331): WP_Hook->apply_filters()\n#20 .../wp-
 includes/plugin.php(524): WP_Hook->do_action()\n#21 .../wp-includes/class-
 wp.php(398): do_action_ref_array()\n#22 .../wp-includes/class-wp.php(770):
 WP->parse_request()\n#23 .../wp-includes/functions.php(1330):
 WP->main()\n#24 .../wp-blog-header.php(16): wp()\n#25 .../index.php(17):
 require('...')\n#26 {main}\n  thrown in .../wp-content/object-cache.php on
 line 1132}}}


 - The code block-

 {{{
 $args = array(
     'post_type'             => 'post',
     'post_status'           => 'publish',
     'posts_per_page'        => 30,
     'ignore_sticky_posts'   => true,
     'meta_key'              => 'some_key',
     'meta_compare'          => 'EXISTS',
     'orderby'               => 'rand'
 );

 $posts = get_posts( $args );
 }}}


 - I am using only one plugin- **Redis Cache**. I cleared the cache, but it
 is still throwing the error.

 - I also rebooted my server, but the problem persists.


 Replying to [comment:3 costdev]:
 > Milestoning for `6.0.1` for visibility.
 >
 > @itsabhineet, can you provide any other details, such as:
 >
 > - All remaining information provided in the error message/stacktrace.
 > - The code block (wrap this in `{{{ code here }}}`) used for
 `get_posts()`.
 > - Caching plugins that you're using.
 > - Whether you can clear the cache and, if so, whether the issue
 persists/changes/disappears after clearing the cache.
 >
 > Thanks!

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/55811#comment:4>
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