[go_router] Fixes crashes when dynamically updates routing tables wit… (flutter#5242)

�h named routes.
fixes flutter#137133

Author: chunhtai

packages/go_router/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 12.0.3
+
+- Fixes crashes when dynamically updates routing tables with named routes.
+
 ## 12.0.2
 
 - Fixes the problem that pathParameters is null in redirect when the Router is recreated.

packages/go_router/example/lib/routing_config.dart

@@ -48,7 +48,7 @@ class _MyAppState extends State<MyApp> {
             return Scaffold(
               appBar: AppBar(title: const Text('Home')),
               body: Center(
-                child: Row(
+                child: Column(
                   mainAxisAlignment: MainAxisAlignment.center,
                   children: <Widget>[
                     ElevatedButton(

packages/go_router/lib/src/configuration.dart

@@ -196,6 +196,7 @@ class RouteConfiguration {
     assert(_debugCheckParentNavigatorKeys(
         routingTable.routes, <GlobalKey<NavigatorState>>[navigatorKey]));
     assert(_debugCheckStatefulShellBranchDefaultLocations(routingTable.routes));
+    _nameToPath.clear();
     _cacheNameToPath('', routingTable.routes);
     log(debugKnownRoutes());
   }

packages/go_router/pubspec.yaml

@@ -1,7 +1,7 @@
 name: go_router
 description: A declarative router for Flutter based on Navigation 2 supporting
   deep linking, data-driven routes and more
-version: 12.0.2
+version: 12.0.3
 repository: https://github.com/flutter/packages/tree/main/packages/go_router
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+go_router%22
 

packages/go_router/test/routing_config_test.dart

@@ -106,4 +106,48 @@ void main() {
     await tester.pumpAndSettle();
     expect(find.text('error'), findsOneWidget);
   });
+
+  testWidgets('routing config works with named route',
+      (WidgetTester tester) async {
+    final ValueNotifier<RoutingConfig> config = ValueNotifier<RoutingConfig>(
+      RoutingConfig(
+        routes: <RouteBase>[
+          GoRoute(path: '/', builder: (_, __) => const Text('home')),
+          GoRoute(
+              path: '/abc',
+              name: 'abc',
+              builder: (_, __) => const Text('/abc')),
+        ],
+      ),
+    );
+    final GoRouter router = await createRouterWithRoutingConfig(
+      config,
+      tester,
+      errorBuilder: (_, __) => const Text('error'),
+    );
+    expect(find.text('home'), findsOneWidget);
+    // Sanity check.
+    router.goNamed('abc');
+    await tester.pumpAndSettle();
+    expect(find.text('/abc'), findsOneWidget);
+
+    config.value = RoutingConfig(
+      routes: <RouteBase>[
+        GoRoute(
+            path: '/', name: 'home', builder: (_, __) => const Text('home')),
+        GoRoute(
+            path: '/abc', name: 'def', builder: (_, __) => const Text('def')),
+      ],
+    );
+    await tester.pumpAndSettle();
+    expect(find.text('def'), findsOneWidget);
+
+    router.goNamed('home');
+    await tester.pumpAndSettle();
+    expect(find.text('home'), findsOneWidget);
+
+    router.goNamed('def');
+    await tester.pumpAndSettle();
+    expect(find.text('def'), findsOneWidget);
+  });
 }