[wp-trac] [WordPress Trac] #12414: delete_post_meta not working correctly when used with save_post

[WordPress Trac]

#12414: delete_post_meta not working correctly when used with save_post
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 Reporter:  studiograsshopper  |       Owner:             
     Type:  defect (bug)       |      Status:  new        
 Priority:  high               |   Milestone:  3.0        
Component:  General            |     Version:  3.0        
 Severity:  major              |    Keywords:  needs-patch
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 I think this is a bug because the same code works fine in 2.9.2.

 I'm using add_metabox hooked to admin_menu to manage certain custom fields
 in the Post and Page Editor. A further function, hooked to save_post,
 gathers the $_POST items from my metabox, sanitises the data and then
 adds, updates or deletes postmeta using add_post_meta(),
 update_post_meta() and delete_post_meta() as required. If a metabox is
 empty, eg when the user blanks out a metabox field, the function uses
 this:

 delete_post_meta($post->ID, $key);

 to delete the postmeta meta_key from the db where the meta_value is empty.

 The problem is that delete_post_meta() is no longer working under the
 latest nightly build (but works fine in WP 2.9.2). No errors are thrown,
 but the postmeta meta_key is not removed from the db.

 As mentioned, this same code works perfectly on WP 2.9.2. I did a search
 on trac to see if I could find any tickets relating to this, but either my
 searching was ineffective, or no one else has reported this.

 add_post_meta() and update_post_meta() work as expected.

 This bug affects several plugins and themes which use this kind of
 functionality.

 For the sake of completeness, I've attached one of the files from a plugin
 of mine which is affected by this.

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Ticket URL: <http://core.trac.wordpress.org/ticket/12414>
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