[wp-trac] [WordPress Trac] #45250: Backward compatibility: Impossible to prefill a new post in WP 5.0

[WordPress Trac]

#45250: Backward compatibility: Impossible to prefill a new post in WP 5.0
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 Reporter:  Chouby             |       Owner:  (none)
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  5.0
Component:  Editor             |     Version:  5.0
 Severity:  normal             |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:
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Comment (by danielbachhuber):

 > Now, filtering the REST response would work for the fields such as
 `menu_order` as you tested it, but it would not work for the title,
 content and excerpt. That means that Gutenberg/WP 5.0 introduces some
 inconsistent behavior. Some fields need to be filtered in the REST
 response and some other using the global `$post` variable (or the filters
 `default_content`, `default_excerpt` and `default_title` which in fact
 have always and are still just an indirect way to modify only 3 properties
 of the global variable).

 Ugh.

 > Is there a way to know if the REST request is coming from the blocks
 editor and not from anywhere outside?

 Not in precise manner, no. `$pagenow` is likely the best indicator you
 have.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45250#comment:4>
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