[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
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 Reporter:  danielbachhuber                  |       Owner:  (none)
     Type:  defect (bug)                     |      Status:  new
 Priority:  normal                           |   Milestone:  4.9.7
Component:  REST API                         |     Version:
 Severity:  normal                           |  Resolution:
 Keywords:  has-patch has-unit-tests commit  |     Focuses:  rest-api,
                                             |  performance
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Comment (by pento):

 @danielbachhuber: Nice work! As this is a large patch, I've committed it
 to `trunk` now, to avoid letting it get stale.

 I think we'll also need to consider how to filter meta fields before
 they're retrieved from the database, too: if you have a lot of meta fields
 registered, it can be a fairly substantial performance drag.

 Also, I would be totally okay with `get_metadata()` (and the related
 `get_*_meta()` functions) accepting an array for `$meta_key`, so data can
 be retrieved in one query, instead of hundreds.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43874#comment:7>
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