public function get_item( $request ) {

		$parent = $this->get_post( $request['parent'] );
		if ( ! $request['parent'] || ! $parent || $this->parent_post_type !== $parent->post_type ) {
			return new WP_Error( 'rest_post_invalid_parent', __( 'Invalid post parent id.' ), array( 'status' => 404 ) );
		}

		$revision = $this->get_post( $request['id'] );
		if ( ! $revision || 'revision' !== $revision->post_type ) {
			return new WP_Error( 'rest_post_invalid_id', __( 'Invalid revision id.' ), array( 'status' => 404 ) );
		}

		$response = $this->prepare_item_for_response( $revision, $request );
		return rest_ensure_response( $response );
	}