dvNotFoundRedirect function

String? dvNotFoundRedirect(GoRouterState state, String to)

Where dartvel.notFoundRedirect sends a path no route serves, or null to leave the location alone.

Called from the generated top-level redirect. It asks whether anything matched (GoRouterState.topRoute is null only when nothing did) rather than reading GoRouterState.error: go_router never sets error on the state a top-level redirect receives, so a check on it is never true and the setting was silently ignored.

Leaves alone a path that already is to, so a target that is itself unserved renders the 404 page instead of redirecting forever, and a path a Studio page document is stored for, since redirecting would make that page unreachable. dvStudioPagesRoute matching is not a page matching: it answers every address, and one with no document is not found.

Implementation

String? dvNotFoundRedirect(GoRouterState state, String to) {
  if (to.isEmpty) return null;
  final GoRoute? matched = state.topRoute;
  if (matched != null && matched.name != dvStudioPagesRouteName) return null;
  final String path = state.uri.path;
  if (path == to) return null;
  if (DVPageStore.cached(path) != null) return null;
  return to;
}