public function get_item( $request ) {
		global $post;

		$post_id = isset( $request['post_id'] ) ? intval( $request['post_id'] ) : 0;

		if ( 0 < $post_id ) {
			$post = get_post( $post_id );

			// Set up postdata since this will be needed if post_id was set.
			setup_postdata( $post );
		}
		$registry = WP_Block_Type_Registry::get_instance();
		$block    = $registry->get_registered( $request['name'] );

		if ( null === $block ) {
			return new WP_Error(
				'block_invalid',
				__( 'Invalid block.' ),
				array(
					'status' => 404,
				)
			);
		}

		$data = array(
			'rendered' => $block->render( $request->get_param( 'attributes' ) ),
		);
		return rest_ensure_response( $data );
	}