fix(ng-view): cleanup should not destroy an already destroyed scope

Refer #1182 and repro https://github.com/chirayuk/sample/tree/issue_1182_leaving_a_nested_ng_view NgView's register cleanup handlers this way: _leaveSubscription = route.onLeave.listen((_) { _leaveSubscription.cancel(); // … _cleanUp(); }); When there are nested ng-views, upon a route change, the parent NgView calls it's _cleanUp() first (which destroys it's child scope) and then the child NgView attempts a cleanup. However, it's child scope is already detached due to the parent NgView cleaning up causing an exception. Stack trace is: 'package:angular/core/scope.dart': Failed assertion: line 335 pos 12: 'isAttached' is not true. STACKTRACE: #0 Scope.destroy (package:angular/core/scope.dart:335:12) #1 NgView._cleanUp (package:angular/routing/ng_view.dart:130:24) #2 NgView._show.<anonymous closure> (package:angular/routing/ng_view.dart:106:15) #3 _rootRunUnary (dart:async/zone.dart:730) #4 _ZoneDelegate.runUnary (dart:async/zone.dart:462) #5 _onRunUnary.<anonymous closure> (package:angular/core/zone.dart:113:63) #6 VmTurnZone._onRunBase (package:angular/core/zone.dart:97:16) #7 _onRunUnary (package:angular/core/zone.dart:113:17) #8 _ZoneDelegate.runUnary (dart:async/zone.dart:462) #9 _CustomizedZone.runUnary (dart:async/zone.dart:667) #10 _BaseZone.runUnaryGuarded (dart:async/zone.dart:582) #11 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:333) #12 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263) #13 _SyncBroadcastStreamController._sendData.<anonymous closure> (dart:async/broadcast_stream_controller.dart:344) #14 _BroadcastStreamController._forEachListener (dart:async/broadcast_stream_controller.dart:297) #15 _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:343) #16 _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:227) #17 Router._leaveCurrentRouteHelper (package:route_hierarchical/client.dart:654:48) #18 Router._leaveCurrentRouteHelper (package:route_hierarchical/client.dart:656:47) #19 Router._leaveCurrentRoute (package:route_hierarchical/client.dart:645:41) #20 Router._leaveOldRoutes (package:route_hierarchical/client.dart:525:30) #21 Router._processNewRoute (package:route_hierarchical/client.dart:497:27) #22 Router._route.<anonymous closure> (package:route_hierarchical/client.dart:481:29) #23 _rootRunUnary (dart:async/zone.dart:730) #24 _ZoneDelegate.runUnary (dart:async/zone.dart:462) #25 _onRunUnary.<anonymous closure> (package:angular/core/zone.dart:113:63) #26 VmTurnZone._onRunBase (package:angular/core/zone.dart:97:16) #27 _onRunUnary (package:angular/core/zone.dart:113:17) #28 _ZoneDelegate.runUnary (dart:async/zone.dart:462) #29 _CustomizedZone.runUnary (dart:async/zone.dart:667) #30 _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:488) #31 _Future._propagateToListeners (dart:async/future_impl.dart:571) #32 _Future._completeWithValue (dart:async/future_impl.dart:331) #33 _Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:393) #34 _rootRun (dart:async/zone.dart:723) #35 _ZoneDelegate.run (dart:async/zone.dart:453) #36 _onScheduleMicrotask.<anonymous closure> (package:angular/core/zone.dart:117:43) #37 VmTurnZone._finishTurn (package:angular/core/zone.dart:143:34) #38 VmTurnZone._onRunBase (package:angular/core/zone.dart:104:43) #39 _onRunUnary (package:angular/core/zone.dart:113:17) #40 _ZoneDelegate.runUnary (dart:async/zone.dart:462) #41 _CustomizedZone.runUnary (dart:async/zone.dart:667) #42 _BaseZone.runUnaryGuarded (dart:async/zone.dart:582) #43 _BaseZone.bindUnaryCallback.<anonymous closure> (dart:async/zone.dart:608) Closes #1182
dart-archive · Jun 26, 2014 · 98b9832 · 98b9832
1 parent 05e2c57
commit 98b9832
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Showing 2 changed files with 36 additions and 10 deletions.
diff --git a/lib/routing/ng_view.dart b/lib/routing/ng_view.dart
@@ -90,6 +90,7 @@ class NgView implements DetachAware, RouteProvider {
   void detach() {
     _route.discard();
     _locationService._unregisterPortal(this);
+    _cleanUp();
   }
 
   void _show(_View viewDef, Route route, List<Module> modules) {
@@ -128,7 +129,6 @@ class NgView implements DetachAware, RouteProvider {
 
     _view.nodes.forEach((node) => node.remove());
     _childScope.destroy();
-
     _view = null;
     _childScope = null;
   }

diff --git a/test/routing/ng_view_spec.dart b/test/routing/ng_view_spec.dart
@@ -5,7 +5,7 @@ import '../_specs.dart';
 import 'package:angular/routing/module.dart';
 import 'package:angular/mock/module.dart';
 
-main() {
+main() => describe('ngView', () {
   describe('Flat ngView', () {
     TestBed _;
     Router router;
@@ -98,42 +98,65 @@ main() {
     beforeEach((TestBed tb, Router _router, TemplateCache templates) {
       _ = tb;
       router = _router;
+      _.rootScope.context['flag'] = true;
 
       templates.put('library.html', new HttpResponse(200,
           '<div><h1>Library</h1>'
-          '<ng-view></ng-view></div>'));
+          '<ng-view ng-if="flag"></ng-view></div>'));
       templates.put('book_list.html', new HttpResponse(200,
           '<h1>Books</h1>'));
       templates.put('book_overview.html', new HttpResponse(200,
           '<h2>Book 1234</h2>'));
       templates.put('book_read.html', new HttpResponse(200,
          '<h2>Read Book 1234</h2>'));
+      templates.put('alt.html', new HttpResponse(200, 'alt'));
     });
 
     it('should switch nested templates', async(() {
       Element root = _.compile('<ng-view></ng-view>');
+      microLeap(); _.rootScope.apply(); microLeap();
       expect(root.text).toEqual('');
 
       router.route('/library/all');
-      microLeap();
+      microLeap(); _.rootScope.apply(); microLeap();
       expect(root.text).toEqual('LibraryBooks');
 
       router.route('/library/1234');
-      microLeap();
+      microLeap(); _.rootScope.apply(); microLeap();
       expect(root.text).toEqual('LibraryBook 1234');
 
       // nothing should change here
       router.route('/library/1234/overview');
-      microLeap();
+      microLeap(); _.rootScope.apply(); microLeap();
       expect(root.text).toEqual('LibraryBook 1234');
 
       // nothing should change here
       router.route('/library/1234/read');
-      microLeap();
+      microLeap(); _.rootScope.apply(); microLeap();
       expect(root.text).toEqual('LibraryRead Book 1234');
     }));
-  });
 
+    it('should not attempt to destroy and already destroyed childscope', async(() {
+      // This can happen with nested ng-views.  Refer
+      // https://github.com/angular/angular.dart/issues/1182
+      // and repro case
+      // https://github.com/chirayuk/sample/tree/issue_1182_leaving_a_nested_ng_view
+      Element root = _.compile('<ng-view></ng-view>');
+      microLeap(); _.rootScope.apply(); microLeap();
+
+      router.route('/library/1234');
+      microLeap(); _.rootScope.apply(); microLeap();
+
+      expect(root.text).toEqual('LibraryBook 1234');
+
+      _.rootScope.context['flag'] = false;
+      microLeap(); _.rootScope.apply(); microLeap();
+      router.route('/alt');
+      microLeap(); _.rootScope.apply(); microLeap();
+
+      expect(root.text).toEqual('alt');
+    }));
+  });
 
   describe('Inline template ngView', () {
     TestBed _;
@@ -165,7 +188,7 @@ main() {
       expect(root.text).toEqual('Hello');
     }));
   });
-}
+});
 
 class FlatRouteInitializer implements Function {
   void call(Router router, RouteViewFactory views) {
@@ -193,7 +216,10 @@ class NestedRouteInitializer implements Function {
                       'read': ngRoute(path: '/read', view: 'book_read.html'),
                       'admin': ngRoute(path: '/admin', view: 'admin.html'),
                   })
-          })
+          }),
+      'alt': ngRoute(
+          path: '/alt',
+          view: 'alt.html'),
     });
   }
 }