fix(router): pass correct component to canDeactivate checks when using two or more sibling router-outlets (#36302)

fixes #34614

There's an edge case where if I use two (or more) sibling <router-outlet>s in two (or more) child routes where their parent route doesn't have a component then preactivation will trigger all canDeactivate checks with the same component because it will use wrong OutletContext.

PR Close #36302

packages/router/src/utils/preactivation.ts

@@ -10,10 +10,10 @@ import {Injector} from '@angular/core';
 
 import {LoadedRouterConfig, RunGuardsAndResolvers} from '../config';
 import {ChildrenOutletContexts, OutletContext} from '../router_outlet_context';
-import {ActivatedRouteSnapshot, RouterStateSnapshot, equalParamsAndUrlSegments} from '../router_state';
+import {ActivatedRouteSnapshot, equalParamsAndUrlSegments, RouterStateSnapshot} from '../router_state';
 import {equalPath} from '../url_tree';
 import {forEach, shallowEqual} from '../utils/collection';
-import {TreeNode, nodeChildrenAsMap} from '../utils/tree';
+import {nodeChildrenAsMap, TreeNode} from '../utils/tree';
 
 export class CanActivate {
   readonly route: ActivatedRouteSnapshot;
@@ -67,8 +67,7 @@ function getClosestLoadedConfig(snapshot: ActivatedRouteSnapshot): LoadedRouterC
 
 function getChildRouteGuards(
     futureNode: TreeNode<ActivatedRouteSnapshot>, currNode: TreeNode<ActivatedRouteSnapshot>|null,
-    contexts: ChildrenOutletContexts | null, futurePath: ActivatedRouteSnapshot[],
+    contexts: ChildrenOutletContexts|null, futurePath: ActivatedRouteSnapshot[], checks: Checks = {
-    checks: Checks = {
       canDeactivateChecks: [],
       canActivateChecks: []
     }): Checks {
@@ -82,8 +81,9 @@ function getChildRouteGuards(
 
   // Process any children left from the current route (not active for the future route)
   forEach(
-      prevChildren, (v: TreeNode<ActivatedRouteSnapshot>, k: string) =>
+      prevChildren,
-                        deactivateRouteAndItsChildren(v, contexts !.getContext(k), checks));
+      (v: TreeNode<ActivatedRouteSnapshot>, k: string) =>
+          deactivateRouteAndItsChildren(v, contexts!.getContext(k), contexts, checks));
 
   return checks;
 }
@@ -127,7 +127,7 @@ function getRouteGuards(
     }
   } else {
     if (curr) {
-      deactivateRouteAndItsChildren(currNode, context, checks);
+      deactivateRouteAndItsChildren(currNode, context, parentContexts, checks);
     }
 
     checks.canActivateChecks.push(new CanActivate(futurePath));
@@ -172,17 +172,21 @@ function shouldRunGuardsAndResolvers(
 }
 
 function deactivateRouteAndItsChildren(
-    route: TreeNode<ActivatedRouteSnapshot>, context: OutletContext | null, checks: Checks): void {
+    route: TreeNode<ActivatedRouteSnapshot>, context: OutletContext|null,
+    parentContexts: ChildrenOutletContexts|null, checks: Checks): void {
   const children = nodeChildrenAsMap(route);
   const r = route.value;
 
   forEach(children, (node: TreeNode<ActivatedRouteSnapshot>, childName: string) => {
     if (!r.component) {
-      deactivateRouteAndItsChildren(node, context, checks);
+      deactivateRouteAndItsChildren(
+          node, parentContexts ? parentContexts.getContext(childName) : context, parentContexts,
+          checks);
     } else if (context) {
-      deactivateRouteAndItsChildren(node, context.children.getContext(childName), checks);
+      deactivateRouteAndItsChildren(
+          node, context.children.getContext(childName), parentContexts, checks);
     } else {
-      deactivateRouteAndItsChildren(node, null, checks);
+      deactivateRouteAndItsChildren(node, null, parentContexts, checks);
     }
   });
 

packages/router/test/integration.spec.ts

@@ -3046,6 +3046,44 @@ describe('Integration', () => {
              expect(location.path()).toEqual('/two-outlets/(a)');
            })));
 
+        it('should call canDeactivate handler with each deactivated component',
+           fakeAsync(inject([Router, Location], (router: Router, location: Location) => {
+             const fixture = createRoot(router, TwoOutletsCmp);
+
+             router.resetConfig([
+               {
+                 path: 'a',
+                 children: [
+                   {
+                     path: 'b1',
+                     component: BlankCmp,
+                     canDeactivate: ['RecordingDeactivate'],
+                   },
+                   {
+                     path: 'b2',
+                     canDeactivate: ['RecordingDeactivate'],
+                     component: SimpleCmp,
+                     outlet: 'aux',
+                   },
+                 ],
+               },
+               {
+                 path: 'c',
+                 component: BlankCmp,
+               },
+             ]);
+
+             router.navigate(['/a', {outlets: {primary: ['b1'], aux: ['b2']}}]);
+             advance(fixture);
+             expect(location.path()).toEqual('/a/(b1//aux:b2)');
+
+             router.navigate(['/c']);
+             advance(fixture);
+
+             expect(log[0].component).toBeAnInstanceOf(BlankCmp);
+             expect(log[1].component).toBeAnInstanceOf(SimpleCmp);
+           })));
+
         it('works with a nested route',
            fakeAsync(inject([Router, Location], (router: Router, location: Location) => {
              const fixture = createRoot(router, RootCmp);