[wp-trac] [WordPress Trac] #34551: Change API error response to focus on singular errors

[WordPress Trac]

#34551: Change API error response to focus on singular errors
-------------------------+--------------------------
 Reporter:  rmccue       |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  4.4
Component:  REST API     |    Version:  trunk
 Severity:  normal       |   Keywords:  dev-feedback
  Focuses:               |
-------------------------+--------------------------
 (Migrating https://github.com/WP-API/WP-API/issues/1473 here.)

 Basically: right now, the API returns a list of objects on error:
 {{{
 [
     {
         "code": "rest_no_route",
         "message": "No route was found matching the URL and request
 method",
         "data": {
             "status": ​404
         }
     }
 ]
 }}}

 This is because under the hood, `WP_Error` holds multiple errors. Most
 people don't use this functionality at all, and this complicates error
 handling on the client site.

 This is p late, but still early enough to change this IMO. Needs sign-off
 though, since it's technically a BC break, and it cuts out some potential
 use cases of `WP_Error`

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Ticket URL: <https://core.trac.wordpress.org/ticket/34551>
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