[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:  4.9.7
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):

 In [changeset:"43087" 43087]:
 {{{
 #!CommitTicketReference repository="" revision="43087"
 REST API: Filter responses based on the `_fields` parameter, before data
 is processed.

 Historically, the REST API would generate the entire response object,
 including running expensive filters, then it would apply the `_fields`
 parameter, discarding the fields that weren't specificed.

 This change causes `_fields` to be applied earlier, so that only requested
 fields are processed.

 Props danielbachhuber.
 See #43874.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/43874#comment:6>
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