Get Block Attributes in JSON REST API

I am trying to make my block attributes show up in the REST API.

To start, I’ve added the rest_api_init hook to whitelist my block for inclusion.

add_action(
‘rest_api_init’,
function () {

if ( ! function_exists( ‘use_block_editor_for_post_type’ ) ) {
require ABSPATH . ‘wp-admin/includes/post.php’;
}

// add Location Block to the WordPress REST API
$post_types = get_post_types_by_support( [ ‘editor’ ] );
foreach ( $post_types as $post_type ) {
if ( use_block_editor_for_post_type( $post_type ) ) {
register_rest_field(
$post_type,
‘blocks’,
[
‘get_callback’ => function ( array $post ) {
$raw_blocks= parse_blocks( $post[‘content’][‘raw’] );
$whitelisted_blocks = [];
foreach ($raw_blocks as $raw_block) {
if( $raw_block[‘blockName’]==’myplugin/block-map-location’ ){
array_push($whitelisted_blocks, $raw_block);
}
}
return $whitelisted_blocks;
},
]
);
}
}
}
);

This outputs my raw block content, but the attrs array is empty.

blocks:
0:
blockName: “myplugin/block-map-location”
attrs: []
innerBlocks:; []
innerHTML: “n<div class=”wp-block-myplugin-block-map-location” aria-label=”Interactive Map” role=”region”><figure><div class=”map-pp” id=”placepress-map” data-lat=”41.50214445″ data-lon=”-81.6751670486689″ data-zoom=”13″ data-basemap=”carto_voyager”></div><figcaption class=”map-caption-pp”>This is the map caption.</figcaption></figure></div>n”
innerContent:
0: “n<div class=”wp-block-myplugin-block-map-location” aria-label=”Interactive Map” role=”region”><figure><div class=”map-pp” id=”placepress-map” data-lat=”41.50214445″ data-lon=”-81.6751670486689″ data-zoom=”13″ data-basemap=”carto_voyager”></div><figcaption class=”map-caption-pp”>This is the map caption.</figcaption></figure></div>n”

To solve this, I’ve tried the following, using the example from the Gutenberg Handbook, but it’s doesn’t seem to have any affect. (Note that in this instance, I am working with a custom “locations” post type and trying to get “lat” and “lon” attributes from my block.)

add_action( ‘init’, ‘register_block_attributes_for_rest’ );
function register_block_attributes_for_rest() {
register_meta( ‘locations’, ‘lat’, array(
‘show_in_rest’ => true,
) );
register_meta( ‘locations’, ‘lon’, array(
‘show_in_rest’ => true,
) );
}

I’m obviously missing something but am not finding any answers in the documentation.

Read more here:: Get Block Attributes in JSON REST API

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