[wp-trac] [WordPress Trac] #45373: New reusable block creation returning blank white screen

[WordPress Trac]

#45373: New reusable block creation returning blank white screen
------------------------------+-----------------------
 Reporter:  umakantsharmamwb  |       Owner:  (none)
     Type:  defect (bug)      |      Status:  new
 Priority:  normal            |   Milestone:  5.1
Component:  Editor            |     Version:  5.0
 Severity:  normal            |  Resolution:
 Keywords:  has-patch         |     Focuses:  rest-api
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Comment (by peterwilsoncc):

 For reference:

 The REST controller returns the `403` from `src/wp-includes/rest-
 api/endpoints/class-wp-rest-posts-controller.php:L404`

 The post type's capabilities are a bit of a mix.

 * the three meta caps each end in `_block`
 * the primitive caps are a 50/50 mix of `*_blocks` and `*_posts`


 {{{
 $ wp eval "var_dump( get_post_type_object( 'wp_block' )->cap );"

 class stdClass#1635 (15) {
   $edit_post =>              "edit_block"
   $read_post =>              "read_block"
   $delete_post =>            "delete_block"
   $edit_posts =>             "edit_blocks"
   $edit_others_posts =>      "edit_others_posts"
   $publish_posts =>          "publish_blocks"
   $read_private_posts =>     "read_private_blocks"
   $read =>                   "edit_posts"
   $delete_posts =>           "delete_blocks"
   $delete_private_posts =>   "delete_private_blocks"
   $delete_published_posts => "delete_published_posts"
   $delete_others_posts =>    "delete_others_posts"
   $edit_private_posts =>     "edit_private_blocks"
   $edit_published_posts =>   "edit_published_posts"
   $create_posts =>           "publish_posts"
 }
 }}}

 In `map_meta_cap()` some of the `*_blocks` are mapped to `*_posts` but I
 am not convinced they're being replaced there as intended as the
 replacement is occurring in the capability being checked rather than the
 capabilities (plural) that get passed to `\WP_User::has_cap()`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45373#comment:14>
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