[wp-trac] [WordPress Trac] #48360: `meta_value` is ignored when empty string is provided

[WordPress Trac]

#48360: `meta_value` is ignored when empty string is provided
--------------------------+------------------------------
 Reporter:  JPry          |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Query         |     Version:  3.2
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by nofearinc):

 I'd love to get this sorted (since I've dealt with this before) but here's
 what the meta query class states right now:


 {{{
                 // WP_Query sets 'meta_value' = '' by default.
                 if ( isset( $qv['meta_value'] ) && '' !==
 $qv['meta_value'] && ( ! is_array( $qv['meta_value'] ) ||
 $qv['meta_value'] ) ) {
                         $primary_meta_query['value'] = $qv['meta_value'];
                 }
 }}}

 I can relate with the use case and we can update the default behavior for
 meta queries, and probably patch it in WP_Query so it passes null as a
 default value. However, I'm not sure how robust this would be, especially
 with third-party plugins relying on this core behavior.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48360#comment:3>
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