[wp-trac] [WordPress Trac] #39803: REST API meta type not working properly for custom post types

[WordPress Trac]

#39803: REST API meta type not working properly for custom post types
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 Reporter:  chriseverson            |       Owner:
     Type:  defect (bug)            |      Status:  new
 Priority:  normal                  |   Milestone:  Awaiting Review
Component:  REST API                |     Version:  4.7
 Severity:  normal                  |  Resolution:
 Keywords:  has-patch dev-feedback  |     Focuses:  rest-api
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Comment (by rheinardkorf):

 @chriseverson I had this problem a couple of days ago. The patch will not
 resolve the issue.

 In the docs (here: https://developer.wordpress.org/rest-api/extending-the-
 rest-api/modifying-responses/#working-with-meta-and-register_meta) you
 will see in the comments that for custom post types the $object_type has
 to be "post".

 What was not documented until recently is that for meta to work is that
 you need to enable `custom-fields` support for your post type. This can be
 done by adding it to the "supports" array of your post type or by using
 `add_theme_support()`. See this in the docs:

 > Note that for meta fields registered on custom post types, the post type
 must have custom-fields support.

 It had me tearing my hair out, but the answer ended up being simple.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39803#comment:2>
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