Rework search page to use signals.

frontend/src/app/pages/search-publications/search-publications.component.ts

@@ -1,11 +1,12 @@
 import {CommonModule} from "@angular/common";
-import { Component, inject, OnDestroy, OnInit } from "@angular/core";
+import {Component, effect, inject} from "@angular/core";
 import {MatProgressSpinner} from "@angular/material/progress-spinner";
 import {ActivatedRoute} from "@angular/router";
-import { Observable, Subscription } from "rxjs";
+import {Observable} from "rxjs";
 import {PublicationListComponent} from "../../components/publication-list/publication-list.component";
 import {Publication} from "../../core/rest-services/publications/model/publication";
 import {SearchPublicationsService} from "./search-publications.service";
+import {toSignal} from "@angular/core/rxjs-interop";
 
 @Component({
     selector: 'app-search-publications',
@@ -14,14 +15,15 @@ import { SearchPublicationsService } from "./search-publications.service";
     imports: [CommonModule, MatProgressSpinner, PublicationListComponent],
     providers: [SearchPublicationsService]
 })
-export class SearchPublicationsComponent implements OnInit, OnDestroy {
+export class SearchPublicationsComponent {
     private searchPublicationsService = inject(SearchPublicationsService);
     private activatedRoute = inject(ActivatedRoute);
-    private queryParamsSubscription?: Subscription;
 
-    ngOnInit(): void {
-        this.queryParamsSubscription = this.activatedRoute.queryParamMap
-            .subscribe(params => {  
+    constructor() {
+      const queryParams = toSignal(this.activatedRoute.queryParamMap);
+      effect(() => {
+        let params = queryParams();
+        if (params) {
           const categoryId = params.get('category-id');
           if (categoryId) {
             this.searchPublicationsService.loadPublications(`category_id=${categoryId}`);
@@ -30,11 +32,8 @@ export class SearchPublicationsComponent implements OnInit, OnDestroy {
           if (query) {
             this.searchPublicationsService.loadPublications(query);
           }
-            });
         }
-
-    ngOnDestroy(): void {
-        this.queryParamsSubscription?.unsubscribe();
+      });
     }
 
     get publications$(): Observable<Publication[]> {

frontend/src/app/pages/search-publications/search-publications.service.ts

@@ -4,7 +4,6 @@ import { BehaviorSubject, Observable } from "rxjs";
 import { Publication } from "../../core/rest-services/publications/model/publication";
 import { MatSnackBar } from "@angular/material/snack-bar";
 
-
 @Injectable()
 export class SearchPublicationsService {
     private publicationRestService = inject(PublicationRestService);