[wp-trac] [WordPress Trac] #43559: wp_ajax_add_meta() does not allow empty values

[WordPress Trac]

#43559: wp_ajax_add_meta() does not allow empty values
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 Reporter:  charlestonsw              |       Owner:
     Type:  enhancement               |      Status:  new
 Priority:  normal                    |   Milestone:  Awaiting Review
Component:  Options, Meta APIs        |     Version:  trunk
 Severity:  normal                    |  Resolution:
 Keywords:  has-unit-tests has-patch  |     Focuses:  rest-api
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Changes (by soulseekah):

 * keywords:  reporter-feedback => has-unit-tests has-patch


Comment:

 Apparently, historically the Meta API did not allow empty values to be
 saved (see #11650).

 The current version of WordPress, however, does allow empty values to be
 saved so with a couple of fixes here and there, empty values can now be
 saved. Attached patch with tests. Patch lifts the limitations imposed by
 both `add_meta` and `wp_ajax_add_meta`.

 P.S. It's still unclear why REST has anything to do with it, though. Care
 to clarify?

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Ticket URL: <https://core.trac.wordpress.org/ticket/43559#comment:4>
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