fix issue where the menu wouldn't update if an option was added after the initial render

src/app/+admin/admin-sidebar/admin-sidebar-section/admin-sidebar-section.component.html

@@ -5,7 +5,7 @@
     <div class="sidebar-collapsible">
             <span class="section-header-text">
         <ng-container
-                *ngComponentOutlet="itemComponents.get(section.id); injector: itemInjectors.get(section.id);"></ng-container>
+                *ngComponentOutlet="(sectionMap$ | async).get(section.id).component; injector: (sectionMap$ | async).get(section.id).injector;"></ng-container>
             </span>
     </div>
 </li>

src/app/+admin/admin-sidebar/admin-sidebar.component.html

@@ -25,7 +25,7 @@
 
             <ng-container *ngFor="let section of (sections | async)">
                 <ng-container
-                        *ngComponentOutlet="sectionComponents.get(section.id); injector: sectionInjectors.get(section.id);"></ng-container>
+                        *ngComponentOutlet="(sectionMap$ | async).get(section.id).component; injector: (sectionMap$ | async).get(section.id).injector;"></ng-container>
             </ng-container>
         </ul>
     </div>

src/app/+admin/admin-sidebar/admin-sidebar.component.ts

@@ -1,9 +1,9 @@
 import { Component, Injector, OnInit } from '@angular/core';
 import { NgbModal } from '@ng-bootstrap/ng-bootstrap';
-import { combineLatest as combineLatestObservable } from 'rxjs';
+import { combineLatest as observableCombineLatest } from 'rxjs';
 import { Observable } from 'rxjs/internal/Observable';
 import { of } from 'rxjs/internal/observable/of';
-import { first, map, take } from 'rxjs/operators';
+import { first, map, take, tap, filter } from 'rxjs/operators';
 import { AuthService } from '../../core/auth/auth.service';
 import { ProcessDataService } from '../../core/data/processes/process-data.service';
 import { ScriptDataService } from '../../core/data/processes/script-data.service';
@@ -99,7 +99,7 @@ export class AdminSidebarComponent extends MenuComponent implements OnInit {
         this.sidebarOpen = !collapsed;
         this.sidebarClosed = collapsed;
       });
-    this.sidebarExpanded = combineLatestObservable(this.menuCollapsed, this.menuPreviewCollapsed)
+    this.sidebarExpanded = observableCombineLatest(this.menuCollapsed, this.menuPreviewCollapsed)
       .pipe(
         map(([collapsed, previewCollapsed]) => (!collapsed || !previewCollapsed))
       );
@@ -323,78 +323,81 @@ export class AdminSidebarComponent extends MenuComponent implements OnInit {
    * the export scripts exist and the current user is allowed to execute them
    */
   createExportMenuSections() {
-    const isAuthorized$: Observable<boolean> = this.authorizationService.isAuthorized(FeatureID.AdministratorOf);
-    isAuthorized$.subscribe((authorized: boolean) => {
-      if (authorized) {
-        const metadataExportScriptExists$ = this.scriptDataService.scripWithNameExistsAndCanExecute(METADATA_EXPORT_SCRIPT_NAME);
-        metadataExportScriptExists$.subscribe((metadataExportScriptExists: boolean) => {
-          const menuList = [
-            /* Export */
-            {
-              id: 'export',
-              active: false,
-              visible: true,
-              model: {
-                type: MenuItemType.TEXT,
-                text: 'menu.section.export'
-              } as TextMenuItemModel,
-              icon: 'sign-out-alt',
-              index: 3
-            },
-            {
-              id: 'export_community',
-              parentID: 'export',
-              active: false,
-              visible: true,
-              model: {
-                type: MenuItemType.LINK,
-                text: 'menu.section.export_community',
-                link: ''
-              } as LinkMenuItemModel,
-            },
-            {
-              id: 'export_collection',
-              parentID: 'export',
-              active: false,
-              visible: true,
-              model: {
-                type: MenuItemType.LINK,
-                text: 'menu.section.export_collection',
-                link: ''
-              } as LinkMenuItemModel,
-            },
-            {
-              id: 'export_item',
-              parentID: 'export',
-              active: false,
-              visible: true,
-              model: {
-                type: MenuItemType.LINK,
-                text: 'menu.section.export_item',
-                link: ''
-              } as LinkMenuItemModel,
-            },
-            {
-              id: 'export_metadata',
-              parentID: 'export',
-              active: true,
-              visible: (authorized && metadataExportScriptExists),
-              model: {
-                type: MenuItemType.ONCLICK,
-                text: 'menu.section.export_metadata',
-                function: () => {
-                  this.modalService.open(ExportMetadataSelectorComponent);
-                }
-              } as OnClickMenuItemModel,
-            },
-          ];
-          menuList.forEach((menuSection) => this.menuService.addSection(this.menuID, Object.assign(menuSection, {
-            shouldPersistOnRouteChange: true
-          })));
-        });
-      }
-    });
+    const menuList = [
+      /* Export */
+      {
+        id: 'export',
+        active: false,
+        visible: true,
+        model: {
+          type: MenuItemType.TEXT,
+          text: 'menu.section.export'
+        } as TextMenuItemModel,
+        icon: 'sign-out-alt',
+        index: 3,
+        shouldPersistOnRouteChange: true
+      },
+      {
+        id: 'export_community',
+        parentID: 'export',
+        active: false,
+        visible: true,
+        model: {
+          type: MenuItemType.LINK,
+          text: 'menu.section.export_community',
+          link: ''
+        } as LinkMenuItemModel,
+        shouldPersistOnRouteChange: true
+      },
+      {
+        id: 'export_collection',
+        parentID: 'export',
+        active: false,
+        visible: true,
+        model: {
+          type: MenuItemType.LINK,
+          text: 'menu.section.export_collection',
+          link: ''
+        } as LinkMenuItemModel,
+        shouldPersistOnRouteChange: true
+      },
+      {
+        id: 'export_item',
+        parentID: 'export',
+        active: false,
+        visible: true,
+        model: {
+          type: MenuItemType.LINK,
+          text: 'menu.section.export_item',
+          link: ''
+        } as LinkMenuItemModel,
+        shouldPersistOnRouteChange: true
+      },
+    ];
+    menuList.forEach((menuSection) => this.menuService.addSection(this.menuID, menuSection));
 
+    observableCombineLatest(
+      this.authorizationService.isAuthorized(FeatureID.AdministratorOf),
+      this.scriptDataService.scriptWithNameExistsAndCanExecute(METADATA_EXPORT_SCRIPT_NAME)
+    ).pipe(
+      filter(([authorized, metadataExportScriptExists]: boolean[]) => authorized && metadataExportScriptExists),
+      take(1)
+    ).subscribe(() => {
+      this.menuService.addSection(this.menuID, {
+        id: 'export_metadata',
+        parentID: 'export',
+        active: true,
+        visible: true,
+        model: {
+          type: MenuItemType.ONCLICK,
+          text: 'menu.section.export_metadata',
+          function: () => {
+            this.modalService.open(ExportMetadataSelectorComponent);
+          }
+        } as OnClickMenuItemModel,
+        shouldPersistOnRouteChange: true
+      });
+    });
   }
 
   /**

src/app/+admin/admin-sidebar/expandable-admin-sidebar-section/expandable-admin-sidebar-section.component.html

@@ -12,15 +12,15 @@
            (click)="toggleSection($event)">
             <span class="section-header-text">
                 <ng-container
-                        *ngComponentOutlet="itemComponents.get(section.id); injector: itemInjectors.get(section.id);"></ng-container>
+                        *ngComponentOutlet="(sectionMap$ | async).get(section.id).component; injector: (sectionMap$ | async).get(section.id).injector;"></ng-container>
             </span>
             <i class="fas fa-chevron-right fa-pull-right"
                [@rotate]="(expanded | async) ? 'expanded' : 'collapsed'" [title]="('menu.section.toggle.' + section.id) | translate"></i>
         </a>
         <ul class="sidebar-sub-level-items list-unstyled" @slide *ngIf="(expanded | async)">
-            <li *ngFor="let subSection of (subSections | async)">
+            <li *ngFor="let subSection of (subSections$ | async)">
                 <ng-container
-                        *ngComponentOutlet="itemComponents.get(subSection.id); injector: itemInjectors.get(subSection.id);"></ng-container>
+                        *ngComponentOutlet="(sectionMap$ | async).get(subSection.id).component; injector: (sectionMap$ | async).get(subSection.id).injector;"></ng-container>
             </li>
         </ul>
     </div>

src/app/core/data/processes/script-data.service.ts

@@ -1,5 +1,8 @@
 import { Injectable } from '@angular/core';
-import { getSucceededRemoteData } from '../../shared/operators';
+import {
+  getSucceededRemoteData,
+  getFirstSucceededRemoteDataPayload
+} from '../../shared/operators';
 import { DataService } from '../data.service';
 import { RemoteDataBuildService } from '../../cache/builders/remote-data-build.service';
 import { Store } from '@ngrx/store';
@@ -11,7 +14,7 @@ import { HttpClient } from '@angular/common/http';
 import { DefaultChangeAnalyzer } from '../default-change-analyzer.service';
 import { Script } from '../../../process-page/scripts/script.model';
 import { ProcessParameter } from '../../../process-page/processes/process-parameter.model';
-import { find, map, switchMap } from 'rxjs/operators';
+import { find, map, switchMap, filter } from 'rxjs/operators';
 import { URLCombiner } from '../../url-combiner/url-combiner';
 import { RemoteData } from '../remote-data';
 import { MultipartPostRequest, RestRequest } from '../request.models';
@@ -20,6 +23,7 @@ import { Observable } from 'rxjs';
 import { RequestEntry } from '../request.reducer';
 import { dataService } from '../../cache/builders/build-decorators';
 import { SCRIPT } from '../../../process-page/scripts/script.resource-type';
+import { hasValue } from '../../../shared/empty.util';
 
 @Injectable()
 @dataService(SCRIPT)
@@ -65,11 +69,11 @@ export class ScriptDataService extends DataService<Script> {
    * Check whether a script with given name exist; user needs to be allowed to execute script for this to to not throw a 401 Unauthorized
    * @param scriptName    script we want to check exists (and we can execute)
    */
-  public scripWithNameExistsAndCanExecute(scriptName: string): Observable<boolean> {
+  public scriptWithNameExistsAndCanExecute(scriptName: string): Observable<boolean> {
     return this.findById(scriptName).pipe(
-      getSucceededRemoteData(),
-      map((scriptRD: RemoteData<Script>) => {
-        return (scriptRD.hasSucceeded);
+      find((rd: RemoteData<Script>) => hasValue(rd.payload) || hasValue(rd.error)),
+      map((rd: RemoteData<Script>) => {
+        return hasValue(rd.payload);
       }));
   }
 }

src/app/navbar/expandable-navbar-section/expandable-navbar-section.component.html

@@ -5,13 +5,13 @@
        id="browseDropdown" (click)="toggleSection($event)"
        data-toggle="dropdown">
         <ng-container
-                *ngComponentOutlet="itemComponents.get(section.id); injector: itemInjectors.get(section.id);"></ng-container>
+                *ngComponentOutlet="(sectionMap$ | async).get(section.id).component; injector: (sectionMap$ | async).get(section.id).injector;"></ng-container>
     </a>
     <ul @slide *ngIf="(active | async)" (click)="deactivateSection($event)"
         class="m-0 shadow-none border-top-0 dropdown-menu show">
-        <ng-container *ngFor="let subSection of (subSections | async)">
+        <ng-container *ngFor="let subSection of (subSections$ | async)">
             <ng-container
-                    *ngComponentOutlet="itemComponents.get(subSection.id); injector: itemInjectors.get(subSection.id);"></ng-container>
+                    *ngComponentOutlet="(sectionMap$ | async).get(subSection.id).component; injector: (sectionMap$ | async).get(subSection.id).injector;"></ng-container>
         </ng-container>
     </ul>
 </li>

src/app/navbar/navbar-section/navbar-section.component.html

@@ -1,4 +1,4 @@
 <li class="nav-item">
   <ng-container
-          *ngComponentOutlet="itemComponents.get(section.id); injector: itemInjectors.get(section.id);"></ng-container>
+          *ngComponentOutlet="(sectionMap$ | async).get(section.id).component; injector: (sectionMap$ | async).get(section.id).injector;"></ng-container>
 </li>

src/app/navbar/navbar.component.html

@@ -7,7 +7,7 @@
                 <ul class="navbar-nav mr-auto shadow-none">
                     <ng-container *ngFor="let section of (sections | async)">
                         <ng-container
-                                *ngComponentOutlet="sectionComponents.get(section.id); injector: sectionInjectors.get(section.id);"></ng-container>
+                                *ngComponentOutlet="(sectionMap$ | async).get(section.id).component; injector: (sectionMap$ | async).get(section.id).injector;"></ng-container>
                     </ng-container>
                 </ul>
             </div>

src/app/shared/menu/menu-section/menu-section.component.ts

@@ -1,13 +1,15 @@
-import { Component, Injector } from '@angular/core';
+import { Component, Injector, OnInit, OnDestroy } from '@angular/core';
 import { MenuService } from '../menu.service';
 import { MenuSection } from '../menu.reducer';
 import { getComponentForMenuItemType } from '../menu-item.decorator';
 import { MenuID, MenuItemType } from '../initial-menus-state';
-import { hasNoValue } from '../../empty.util';
+import { hasNoValue, hasValue } from '../../empty.util';
 import { Observable } from 'rxjs/internal/Observable';
 import { MenuItemModel } from '../menu-item/models/menu-item.model';
-import { distinctUntilChanged } from 'rxjs/operators';
+import { distinctUntilChanged, switchMap } from 'rxjs/operators';
 import { GenericConstructor } from '../../../core/shared/generic-constructor';
+import { Subscription } from 'rxjs/internal/Subscription';
+import { BehaviorSubject } from 'rxjs';
 
 /**
  * A basic implementation of a menu section's component
@@ -16,7 +18,7 @@ import { GenericConstructor } from '../../../core/shared/generic-constructor';
   selector: 'ds-menu-section',
   template: ''
 })
-export class MenuSectionComponent {
+export class MenuSectionComponent implements OnInit, OnDestroy{
 
   /**
    * Observable that emits whether or not this section is currently active
@@ -28,20 +30,25 @@ export class MenuSectionComponent {
    */
   menuID: MenuID;
 
-  /**
-   * List of Injectors for each dynamically rendered menu item of this section
-   */
-  itemInjectors: Map<string, Injector> = new Map<string, Injector>();
-
-  /**
-   * List of child Components for each dynamically rendered menu item of this section
-   */
-  itemComponents: Map<string, GenericConstructor<MenuSectionComponent>> = new Map<string, GenericConstructor<MenuSectionComponent>>();
-
   /**
    * List of available subsections in this section
    */
-  subSections: Observable<MenuSection[]>;
+  subSections$: Observable<MenuSection[]>;
+
+  /**
+   * Map of components and injectors for each dynamically rendered menu section
+   */
+  sectionMap$: BehaviorSubject<Map<string, {
+    injector: Injector,
+    component: GenericConstructor<MenuSectionComponent>
+  }>> = new BehaviorSubject(new Map());
+
+
+  /**
+   * Array to track all subscriptions and unsubscribe them onDestroy
+   * @type {Array}
+   */
+  subs: Subscription[] = [];
 
   constructor(public section: MenuSection, protected menuService: MenuService, protected injector: Injector) {
   }
@@ -85,15 +92,34 @@ export class MenuSectionComponent {
    * Method for initializing all injectors and component constructors for the menu items in this section
    */
   private initializeInjectorData() {
-    this.itemInjectors.set(this.section.id, this.getItemModelInjector(this.section.model));
-    this.itemComponents.set(this.section.id, this.getMenuItemComponent(this.section.model));
-    this.subSections = this.menuService.getSubSectionsByParentID(this.menuID, this.section.id);
-    this.subSections.subscribe((sections: MenuSection[]) => {
-      sections.forEach((section: MenuSection) => {
-        this.itemInjectors.set(section.id, this.getItemModelInjector(section.model));
-        this.itemComponents.set(section.id, this.getMenuItemComponent(section.model));
+    this.updateSectionMap(
+      this.section.id,
+      this.getItemModelInjector(this.section.model),
+      this.getMenuItemComponent(this.section.model)
+    );
+    this.subSections$ = this.menuService.getSubSectionsByParentID(this.menuID, this.section.id);
+    this.subs.push(
+      this.subSections$.pipe(
+        // if you return an array from a switchMap it will emit each element as a separate event.
+        // So this switchMap is equivalent to a subscribe with a forEach inside
+        switchMap((sections: MenuSection[]) => sections)
+      ).subscribe((section: MenuSection) => {
+        this.updateSectionMap(
+          section.id,
+          this.getItemModelInjector(section.model),
+          this.getMenuItemComponent(section.model)
+        )
       })
-    })
+    );
+  }
+
+  /**
+   * Update the sectionMap
+   */
+  private updateSectionMap(id, injector, component) {
+    const nextMap = this.sectionMap$.getValue();
+    nextMap.set(id, { injector, component });
+    this.sectionMap$.next(nextMap);
   }
 
   /**
@@ -124,4 +150,12 @@ export class MenuSectionComponent {
     });
   }
 
+  /**
+   * Unsubscribe from open subscriptions
+   */
+  ngOnDestroy(): void {
+    this.subs
+      .filter((subscription) => hasValue(subscription))
+      .forEach((subscription) => subscription.unsubscribe());
+  }
 }

src/app/shared/menu/menu.component.ts

@@ -3,12 +3,14 @@ import { Observable } from 'rxjs/internal/Observable';
 import { MenuService } from './menu.service';
 import { MenuID } from './initial-menus-state';
 import { MenuSection } from './menu.reducer';
-import { distinctUntilChanged, first, map } from 'rxjs/operators';
+import { distinctUntilChanged, first, map, tap, switchMap, take } from 'rxjs/operators';
 import { GenericConstructor } from '../../core/shared/generic-constructor';
 import { hasValue } from '../empty.util';
 import { MenuSectionComponent } from './menu-section/menu-section.component';
 import { getComponentForMenu } from './menu-section.decorator';
 import { Subscription } from 'rxjs/internal/Subscription';
+import { BehaviorSubject } from 'rxjs';
+import { compareArraysUsingIds } from '../../+item-page/simple/item-types/shared/item-relationships-utils';
 
 /**
  * A basic implementation of a MenuComponent
@@ -44,14 +46,12 @@ export class MenuComponent implements OnInit, OnDestroy {
   sections: Observable<MenuSection[]>;
 
   /**
-   * List of Injectors for each dynamically rendered menu section
+   * Map of components and injectors for each dynamically rendered menu section
    */
-  sectionInjectors: Map<string, Injector> = new Map<string, Injector>();
-
-  /**
-   * List of child Components for each dynamically rendered menu section
-   */
-  sectionComponents: Map<string, GenericConstructor<MenuSectionComponent>> = new Map<string, GenericConstructor<MenuSectionComponent>>();
+  sectionMap$: BehaviorSubject<Map<string, {
+    injector: Injector,
+    component: GenericConstructor<MenuSectionComponent>
+  }>> = new BehaviorSubject(new Map());
 
   /**
    * Prevent unnecessary rerendering
@@ -79,13 +79,25 @@ export class MenuComponent implements OnInit, OnDestroy {
     this.menuCollapsed = this.menuService.isMenuCollapsed(this.menuID);
     this.menuPreviewCollapsed = this.menuService.isMenuPreviewCollapsed(this.menuID);
     this.menuVisible = this.menuService.isMenuVisible(this.menuID);
-    this.sections = this.menuService.getMenuTopSections(this.menuID).pipe(distinctUntilChanged((x, y) => JSON.stringify(x) === JSON.stringify(y)));
-    this.subs.push(this.sections.subscribe((sections: MenuSection[]) => {
-      sections.forEach((section: MenuSection) => {
-        this.sectionInjectors.set(section.id, this.getSectionDataInjector(section));
-        this.getSectionComponent(section).pipe(first()).subscribe((constr) => this.sectionComponents.set(section.id, constr));
-      });
-    }));
+    this.sections = this.menuService.getMenuTopSections(this.menuID).pipe(distinctUntilChanged(compareArraysUsingIds()));
+    this.subs.push(
+      this.sections.pipe(
+        // if you return an array from a switchMap it will emit each element as a separate event.
+        // So this switchMap is equivalent to a subscribe with a forEach inside
+        switchMap((sections: MenuSection[]) => sections),
+        switchMap((section: MenuSection) => this.getSectionComponent(section).pipe(
+          map((component:  GenericConstructor<MenuSectionComponent>) =>  ({ section, component }))
+        )),
+        distinctUntilChanged((x,y) => x.section.id === y.section.id)
+      ).subscribe(({ section, component}) => {
+        const nextMap = this.sectionMap$.getValue();
+        nextMap.set(section.id, {
+          injector: this.getSectionDataInjector(section),
+          component
+        });
+        this.sectionMap$.next(nextMap);
+      })
+    );
   }
 
   /**