[wp-trac] [WordPress Trac] #31225: wp.newPost doesn't save custom fields starting with an underscore

[WordPress Trac]

#31225: wp.newPost doesn't save custom fields starting with an underscore
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 Reporter:  pcfreak30     |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  XML-RPC       |     Version:  4.1
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by redsweater):

 Hi pcfreak30 - This is not an issue with the API per se but reflects the
 underlying, built-in protection mechanism for metadata fields in
 WordPress. By default, any meta field with an underscore prefix is
 considered "protected" unless otherwise configured as unprotected.

 So for example, a plugin that relies upon underscore-prefixed custom
 fields for its data should register a metadata callback with
 register_meta() or else e.g. install a filter on the is_protected_meta
 filter.

 Daniel

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Ticket URL: <https://core.trac.wordpress.org/ticket/31225#comment:1>
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