DashboardScene: Fixes minor issue transitioning between dashboards (#86262)

* DashboardScene: Fixes minor issue transitioning between dashboards

* Update

public/app/features/dashboard-scene/pages/DashboardScenePage.tsx

@@ -72,6 +72,11 @@ export function DashboardScenePage({ match, route, queryParams, history }: Props
     );
   }
 
+  // Do not render anything when transitioning from one dashboard to another
+  if (dashboard.state.uid && dashboard.state.uid !== match.params.uid) {
+    return null;
+  }
+
   return (
     <>
       <dashboard.Component model={dashboard} key={dashboard.state.key} />

public/app/features/dashboard-scene/pages/DashboardScenePageStateManager.test.ts

@@ -1,6 +1,6 @@
 import { advanceBy } from 'jest-date-mock';
 
-import { locationService } from '@grafana/runtime';
+import { BackendSrv, locationService, setBackendSrv } from '@grafana/runtime';
 import { getUrlSyncManager } from '@grafana/scenes';
 import store from 'app/core/store';
 import { DASHBOARD_FROM_LS_KEY } from 'app/features/dashboard/state/initDashboard';
@@ -41,6 +41,18 @@ describe('DashboardScenePageStateManager', () => {
       expect(loader.state.loadError).toBe('Error: Dashboard not found');
     });
 
+    it('should handle home dashboard redirect', async () => {
+      setBackendSrv({
+        get: () => Promise.resolve({ redirectUri: '/d/asd' }),
+      } as unknown as BackendSrv);
+
+      const loader = new DashboardScenePageStateManager({});
+      await loader.loadDashboard({ uid: '', route: DashboardRoutes.Home });
+
+      expect(loader.state.dashboard).toBeUndefined();
+      expect(loader.state.loadError).toBeUndefined();
+    });
+
     it('shoud fetch dashboard from local storage and remove it after if it exists', async () => {
       const loader = new DashboardScenePageStateManager({});
       const localStorageDashboard = { uid: 'fake-dash' };

public/app/features/dashboard-scene/pages/DashboardScenePageStateManager.ts

@@ -90,11 +90,8 @@ export class DashboardScenePageStateManager extends StateManagerBase<DashboardSc
         case DashboardRoutes.Home:
           rsp = await getBackendSrv().get('/api/dashboards/home');
 
-          // If user specified a custom home dashboard redirect to that
-          if (rsp?.redirectUri) {
-            const newUrl = locationUtil.stripBaseFromUrl(rsp.redirectUri);
-            locationService.replace(newUrl);
-            return null;
+          if (rsp.redirectUri) {
+            return rsp;
           }
 
           if (rsp?.meta) {
@@ -171,6 +168,10 @@ export class DashboardScenePageStateManager extends StateManagerBase<DashboardSc
   public async loadDashboard(options: LoadDashboardOptions) {
     try {
       const dashboard = await this.loadScene(options);
+      if (!dashboard) {
+        return;
+      }
+
       if (!(config.publicDashboardAccessToken && dashboard.state.controls?.state.hideTimeControls)) {
         dashboard.startUrlSync();
       }
@@ -181,12 +182,14 @@ export class DashboardScenePageStateManager extends StateManagerBase<DashboardSc
     }
   }
 
-  private async loadScene(options: LoadDashboardOptions): Promise<DashboardScene> {
+  private async loadScene(options: LoadDashboardOptions): Promise<DashboardScene | null> {
     const comingFromExplore = Boolean(
       localStorageStore.getObject<DashboardDTO>(DASHBOARD_FROM_LS_KEY) &&
         options.keepDashboardFromExploreInLocalStorage === false
     );
 
+    this.setState({ isLoading: true });
+
     const rsp = await this.fetchDashboard(options);
 
     const fromCache = this.cache[options.uid];
@@ -198,8 +201,6 @@ export class DashboardScenePageStateManager extends StateManagerBase<DashboardSc
       }
     }
 
-    this.setState({ isLoading: true });
-
     if (rsp?.dashboard) {
       const scene = transformSaveModelToScene(rsp);
 
@@ -211,6 +212,12 @@ export class DashboardScenePageStateManager extends StateManagerBase<DashboardSc
       return scene;
     }
 
+    if (rsp?.redirectUri) {
+      const newUrl = locationUtil.stripBaseFromUrl(rsp.redirectUri);
+      locationService.replace(newUrl);
+      return null;
+    }
+
     throw new Error('Dashboard not found');
   }