Projection improved.

src/Squidex/app/features/administration/state/event-consumers.state.ts

@@ -34,7 +34,7 @@ export class EventConsumersState extends State<Snapshot> {
         this.project(x => x.eventConsumers);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     constructor(
         private readonly dialogs: DialogService,

src/Squidex/app/features/administration/state/users.state.ts

@@ -61,10 +61,10 @@ export class UsersState extends State<Snapshot> {
         this.project(x => x.selectedUser);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     constructor(
         private readonly dialogs: DialogService,

src/Squidex/app/framework/state.ts

@@ -6,8 +6,8 @@
  */
 
 import { AbstractControl } from '@angular/forms';
-import { BehaviorSubject, Observable } from 'rxjs';
-import { distinctUntilChanged, map } from 'rxjs/operators';
+import { BehaviorSubject, combineLatest, Observable } from 'rxjs';
+import { distinctUntilChanged, map, shareReplay } from 'rxjs/operators';
 
 import { ErrorDto, getDisplayMessage } from './utils/error';
 
@@ -167,15 +167,19 @@ export class State<T extends {}> {
         return this.state.value;
     }
 
-    public project<R1>(project1: (value: T) => R1, compare?: (x: R1, y: R1) => boolean) {
+    public project<M>(project1: (value: T) => M, compare?: (x: M, y: M) => boolean) {
         return this.changes.pipe(
-            map(x => project1(x)), distinctUntilChanged(compare));
+            map(x => project1(x)), distinctUntilChanged(compare), shareReplay());
     }
 
-    public project2<R1, R2>(project1: (value: T) => R1, project2: (value: R1) => R2, compare?: (x: R2, y: R2) => boolean) {
-        return this.changes.pipe(
-            map(x => project1(x)), distinctUntilChanged(),
-            map(x => project2(x)), distinctUntilChanged(compare));
+    public projectFrom<M, N>(source: Observable<M>, project: (value: M) => N, compare?: (x: N, y: N) => boolean) {
+        return source.pipe(
+            map(x => project(x)), distinctUntilChanged(compare), shareReplay());
+    }
+
+    public projectFrom2<M, N, O>(lhs: Observable<M>, rhs: Observable<N>, project: (l: M, r: N) => O, compare?: (x: O, y: O) => boolean) {
+        return combineLatest(lhs, rhs, (x, y) => project(x, y)).pipe(
+            distinctUntilChanged(compare), shareReplay());
     }
 
     constructor(state: Readonly<T>) {

src/Squidex/app/shared/state/assets.state.ts

@@ -51,14 +51,20 @@ interface Snapshot {
 
 @Injectable()
 export class AssetsState extends State<Snapshot> {
+    public tagsUnsorted =
+        this.project(x => x.tags);
+
+    public tagsSelected =
+        this.project(x => x.tags);
+
     public tags =
-        this.project2(x => x.tags, x => sort(x));
+        this.projectFrom(this.tagsUnsorted, x => sort(x));
 
     public tagsNames =
-        this.project2(x => x.tags, x => Object.keys(x));
+        this.projectFrom(this.tagsUnsorted, x => Object.keys(x));
 
     public selectedTagNames =
-        this.project2(x => x.tagsSelected, x => Object.keys(x));
+        this.projectFrom(this.tagsSelected, x => Object.keys(x));
 
     public assets =
         this.project(x => x.assets);
@@ -70,10 +76,10 @@ export class AssetsState extends State<Snapshot> {
         this.project(x => x.assetsPager);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     constructor(
         private readonly appsState: AppsState,

src/Squidex/app/shared/state/backups.state.ts

@@ -39,13 +39,13 @@ export class BackupsState extends State<Snapshot> {
         this.project(x => x.backups);
 
     public maxBackupsReached =
-        this.project(x => x.backups.length >= 10);
+        this.projectFrom(this.backups, x => x.length >= 10);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     constructor(
         private readonly appsState: AppsState,

src/Squidex/app/shared/state/clients.state.ts

@@ -51,10 +51,10 @@ export class ClientsState extends State<Snapshot> {
         this.project(x => x.clients);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     constructor(
         private readonly clientsService: ClientsService,

src/Squidex/app/shared/state/comments.state.ts

@@ -38,7 +38,7 @@ export class CommentsState extends State<Snapshot> {
         this.project(x => x.comments);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     constructor(
         private readonly appsState: AppsState,

src/Squidex/app/shared/state/contents.state.ts

@@ -74,22 +74,22 @@ export abstract class ContentsStateBase extends State<Snapshot> {
         this.project(x => x.contentsQuery);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     public canCreateAndPublish =
-        this.project(x => !!x.canCreateAndPublish);
+        this.project(x => x.canCreateAndPublish === true);
 
     public canCreateAny =
-        this.project(x => !!x.canCreate || !!x.canCreateAndPublish);
+        this.project(x => x.canCreate === true || x.canCreateAndPublish === true);
 
     public statuses =
         this.project(x => x.statuses);
 
     public statusQueries =
-        this.project2(x => x.statuses, x => buildQueries(x));
+        this.projectFrom(this.statuses, x => buildQueries(x));
 
     constructor(
         private readonly appsState: AppsState,

src/Squidex/app/shared/state/contributors.state.ts

@@ -6,8 +6,8 @@
  */
 
 import { Injectable } from '@angular/core';
-import { combineLatest, Observable, throwError } from 'rxjs';
-import { catchError, shareReplay, tap } from 'rxjs/operators';
+import { Observable, throwError } from 'rxjs';
+import { catchError, tap } from 'rxjs/operators';
 
 import {
     DialogService,
@@ -76,19 +76,19 @@ export class ContributorsState extends State<Snapshot> {
         this.project(x => x.maxContributors);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     public filtered =
-        combineLatest(this.queryRegex, this.contributors, (q, c) => getFilteredContributors(c, q)).pipe(shareReplay());
+        this.projectFrom2(this.queryRegex, this.contributors, (q, c) => getFilteredContributors(c, q));
 
     public contributorsPaged =
-        combineLatest(this.page, this.filtered, (p, c) => getPagedContributors(c, p));
+        this.projectFrom2(this.page, this.filtered, (p, c) => getPagedContributors(c, p));
 
     public contributorsPager =
-        combineLatest(this.page, this.filtered, (p, c) => new Pager(c.length, p, PAGE_SIZE));
+        this.projectFrom2(this.page, this.filtered, (p, c) => new Pager(c.length, p, PAGE_SIZE));
 
     constructor(
         private readonly contributorsService: ContributorsService,

src/Squidex/app/shared/state/languages.state.ts

@@ -74,10 +74,10 @@ export class LanguagesState extends State<Snapshot> {
         this.project(x => x.allLanguagesNew);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     constructor(
         private readonly appLanguagesService: AppLanguagesService,

src/Squidex/app/shared/state/patterns.state.ts

@@ -49,10 +49,10 @@ export class PatternsState extends State<Snapshot> {
         this.project(x => x.patterns);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     constructor(
         private readonly patternsService: PatternsService,

src/Squidex/app/shared/state/plans.state.ts

@@ -55,10 +55,10 @@ export class PlansState extends State<Snapshot> {
         this.project(x => x.plans);
 
     public isOwner =
-        this.project(x => !!x.isOwner);
+        this.project(x => x.isOwner === true);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public isDisabled =
         this.project(x => !x.isOwner);

src/Squidex/app/shared/state/roles.state.ts

@@ -49,10 +49,10 @@ export class RolesState extends State<Snapshot> {
         this.project(x => x.roles);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     constructor(
         private readonly rolesService: RolesService,

src/Squidex/app/shared/state/rule-events.state.ts

@@ -41,7 +41,7 @@ export class RuleEventsState extends State<Snapshot> {
         this.project(x => x.ruleEventsPager);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     constructor(
         private readonly appsState: AppsState,

src/Squidex/app/shared/state/rules.state.ts

@@ -46,13 +46,13 @@ export class RulesState extends State<Snapshot> {
         this.project(x => x.rules);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     public canReadEvents =
-        this.project(x => !!x.canReadEvents);
+        this.project(x => x.canReadEvents === true);
 
     constructor(
         private readonly appsState: AppsState,

src/Squidex/app/shared/state/schemas.state.ts

@@ -66,8 +66,8 @@ export class SchemasState extends State<Snapshot> {
         return this.snapshot.selectedSchema ? this.snapshot.selectedSchema.name : '';
     }
 
-    public categories =
-        this.project2(x => x, x => buildCategories(x.categories, x.schemas));
+    public categoriesPlain =
+        this.project(x => x.categories);
 
     public selectedSchema =
         this.project(x => x.selectedSchema, sameSchema);
@@ -75,14 +75,17 @@ export class SchemasState extends State<Snapshot> {
     public schemas =
         this.project(x => x.schemas);
 
-    public publishedSchemas =
-        this.project2(x => x.schemas, x => x.filter(s => s.isPublished));
-
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
+
+    public publishedSchemas =
+        this.projectFrom(this.schemas, x => x.filter(s => s.isPublished));
+
+    public categories =
+        this.projectFrom2(this.schemas, this.categoriesPlain, (s, c) => buildCategories(c, s));
 
     constructor(
         private readonly appsState: AppsState,

src/Squidex/app/shared/state/ui.state.ts

@@ -49,16 +49,16 @@ export class UIState extends State<Snapshot> {
         this.project(x => x.settings);
 
     public canReadEvents =
-        this.project(x => !!x.canReadEvents);
+        this.project(x => x.canReadEvents === true);
 
     public canReadUsers =
-        this.project(x => !!x.canReadUsers);
+        this.project(x => x.canReadUsers === true);
 
     public canRestore =
-        this.project(x => !!x.canRestore);
+        this.project(x => x.canRestore === true);
 
     public canUserAdminResource =
-        this.project(x => !!x.canRestore || !!x.canReadUsers || !!x.canReadEvents);
+        this.project(x => x.canRestore === true || x.canReadUsers === true || x.canReadEvents === true);
 
     public get<T>(path: string, defaultValue: T) {
         return this.settings.pipe(map(x => this.getValue(x, path, defaultValue)),

src/Squidex/app/shared/state/workflows.state.ts

@@ -53,10 +53,10 @@ export class WorkflowsState extends State<Snapshot> {
         this.project(x => x.errors);
 
     public isLoaded =
-        this.project(x => !!x.isLoaded);
+        this.project(x => x.isLoaded === true);
 
     public canCreate =
-        this.project(x => !!x.canCreate);
+        this.project(x => x.canCreate === true);
 
     constructor(
         private readonly workflowsService: WorkflowsService,