[wp-trac] [WordPress Trac] #41159: REST API: Add a way to determine if a request is an embedded "sub-request"

[WordPress Trac]

#41159: REST API: Add a way to determine if a request is an embedded "sub-request"
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 Reporter:  jnylen0      |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Future Release
Component:  REST API     |    Version:  4.4
 Severity:  normal       |   Keywords:  needs-patch needs-unit-tests
  Focuses:  rest-api     |
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 Currently it's difficult to determine whether a request is the "root"
 request or a "child" embedded request due to `?_embed` using multiple
 `WP_REST_Request` objects.  #38964 will help a bit, but we should also add
 a way to directly track whether a request is part of an embed tree.
 Something like this:

 - `$request->is_embed`: boolean property indicating whether the request is
 a "child" embedded request
 - `$request->embed_parent`: `WP_REST_Request` object pointing to parent
 request, or `null` if none

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Ticket URL: <https://core.trac.wordpress.org/ticket/41159>
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