[wp-trac] [WordPress Trac] #43874: REST API: Only render fields specific to request when _fields= is used

[WordPress Trac]

#43874: REST API: Only render fields specific to request when _fields= is used
-----------------------------------+--------------------
 Reporter:  danielbachhuber        |      Owner:  (none)
     Type:  defect (bug)           |     Status:  new
 Priority:  normal                 |  Milestone:  4.9.6
Component:  REST API               |    Version:
 Severity:  normal                 |   Keywords:
  Focuses:  rest-api, performance  |
-----------------------------------+--------------------
 Given a request like:

 {{{
 GET wp/v2/posts?_fields=id,title
 }}}

 It doesn't make sense for the REST API to generate `content` for each
 response object, only to later discard it.

 Instead, if `_fields=` is used, we should only render the fields
 specified.

 Previously #38131

 From https://github.com/WordPress/gutenberg/issues/5376

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Ticket URL: <https://core.trac.wordpress.org/ticket/43874>
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