[wp-trac] [WordPress Trac] #35658: Provide additional data for registered meta through register_meta()

[WordPress Trac]

#35658: Provide additional data for registered meta through register_meta()
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 Reporter:  jeremyfelt                    |       Owner:
     Type:  enhancement                   |      Status:  new
 Priority:  normal                        |   Milestone:  Awaiting Review
Component:  Options, Meta APIs            |     Version:
 Severity:  normal                        |  Resolution:
 Keywords:  needs-patch needs-unit-tests  |     Focuses:
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Comment (by jeremyfelt):

 Results of some more discussion around this:

 * We'll need to start using a `$wp_meta_keys` global to track registered
 meta keys.
 * Uniqueness is important. A meta key can technically exist for multiple
 types objects (post, comment, user, term) as well as types of those types
 of objects—custom post types. The global array should track these uniquely
 so that a proper JSON Schema can be output.

 It's possible the first argument of `register_meta()` should be an array:

 {{{
 $args = array(
     'post' => array( 'post', 'cpt-one', 'cpt-two' ),
     'term',
 );
 register_meta( $args, 'my_meta_key', 'my_sanitize_callback' );
 }}}

 The third argument should be an array as well (as @swissspidy just
 mentioned):

 {{{
 $object_args = array(
     'post' => array( 'post', 'cpt-one', 'cpt-two' ),
     'term',
 );

 $args = array(
     'rest_data_type' => 'string',
     'rest_description' => 'A description of this meta for the JSON
 Schema',
     'sanitize_callback' => 'my_sanitization_callback',
 );
 $register_meta( $object_args, 'my_meta_key', $args );
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/35658#comment:2>
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