public function get_items( $request ) {
		$args = array(
			'profile_group_id'       => $request['profile_group_id'],
			'user_id'                => $request['user_id'],
			'member_type'            => $request['member_type'],
			'hide_empty_groups'      => $request['hide_empty_groups'],
			'hide_empty_fields'      => $request['hide_empty_fields'],
			'fetch_fields'           => $request['fetch_fields'],
			'fetch_field_data'       => $request['fetch_field_data'],
			'fetch_visibility_level' => $request['fetch_visibility_level'],
			'exclude_groups'         => $request['exclude_groups'],
			'exclude_fields'         => $request['exclude_fields'],
			'update_meta_cache'      => $request['update_meta_cache'],
		);

		if ( empty( $request['member_type'] ) ) {
			$args['member_type'] = null;
		}

		if ( empty( $request['exclude_fields'] ) ) {
			$args['exclude_fields'] = false;
		}

		if ( empty( $request['exclude_groups'] ) ) {
			$args['exclude_groups'] = false;
		}

		/**
		 * Filter the query arguments for the request.
		 *
		 * @since 5.0.0
		 *
		 * @param array           $args    Key value array of query var to query value.
		 * @param WP_REST_Request $request The request sent to the API.
		 */
		$args = apply_filters( 'bp_rest_xprofile_field_groups_get_items_query_args', $args, $request );

		// Actually, query it.
		$field_groups = bp_xprofile_get_groups( $args );

		$retval = array();
		foreach ( (array) $field_groups as $item ) {
			$retval[] = $this->prepare_response_for_collection(
				$this->prepare_item_for_response( $item, $request )
			);
		}

		$response = rest_ensure_response( $retval );

		/**
		 * Fires after a list of field groups are fetched via the REST API.
		 *
		 * @since 5.0.0
		 *
		 * @param array            $field_groups Fetched field groups.
		 * @param WP_REST_Response $response     The response data.
		 * @param WP_REST_Request  $request      The request sent to the API.
		 */
		do_action( 'bp_rest_xprofile_field_groups_get_items', $field_groups, $response, $request );

		return $response;
	}