$prepared = parent::prepare_collection_query_args( $request );
		if ( is_wp_error( $prepared ) ) {
			return $prepared;
		}

		$prepared['id']   = $request['id'];
		$prepared['page'] = ! isset( $prepared['page'] ) ? 1 : $prepared['page'];

		return $this->prepare_items_query( $prepared, $request );

	}

	/**
	 * Determines the allowed query_vars for a get_items() response and prepares
	 * them for WP_Query.
	 *
	 * @since 1.0.0-beta.1
	 *
	 * @param array           $prepared_args Optional. Prepared WP_Query arguments. Default empty array.
	 * @param WP_REST_Request $request       Optional. Full details about the request.
	 * @return array Items query arguments.
	 */
	protected function prepare_items_query( $prepared_args = array(), $request = null ) {

		$query_args = array();

		foreach ( $prepared_args as $key => $value ) {
			$query_args[ $key ] = $value;
		}

		// Filters.
		if ( isset( $query_args['student'] ) && ! is_array( $query_args['student'] ) ) {
			$query_args['student'] = array_map( 'absint', explode( ',', $query_args['student'] ) );
		}