add new methods to entities service

src/lib/listing/services/entities.service.ts

@@ -1,5 +1,5 @@
 import { Inject, Injectable, InjectionToken, Injector, Optional } from '@angular/core';
-import { BehaviorSubject, combineLatest, Observable, pipe } from 'rxjs';
+import { BehaviorSubject, combineLatest, Observable, pipe, Subject } from 'rxjs';
 import { distinctUntilChanged, map, tap } from 'rxjs/operators';
 import { FilterService, getFilteredEntities } from '../../filtering';
 import { SearchService } from '../../search';
@@ -32,6 +32,7 @@ export class EntitiesService<E extends IListable, I = E> extends GenericService<
     readonly selectedLength$: Observable<number>;
     readonly all$: Observable<E[]>;
     readonly allLength$: Observable<number>;
+    readonly entityChanged$ = new Subject<E>();
     private readonly _filterService = this._injector.get(FilterService);
     private readonly _searchService = this._injector.get<SearchService<E>>(SearchService);
     private readonly _all$ = new BehaviorSubject<E[]>([]);
@@ -138,8 +139,23 @@ export class EntitiesService<E extends IListable, I = E> extends GenericService<
         this.setSelected(this.selected.filter((el, idx) => idx !== currentEntityIdx));
     }
 
+    find(id: string): E | undefined {
+        return this.all.find(entity => entity.id === id);
+    }
+
+    has(id: string): boolean {
+        return this.all.some(entity => entity.id === id);
+    }
+
     updateSelection(): void {
         const items = this._displayed.filter(item => this.selected.includes(item));
         this.setSelected(items);
     }
+
+    replace(newEntity: E): void {
+        const all = this.all.filter(item => item.id !== newEntity.id);
+        all.push(newEntity);
+        this.setEntities(all);
+        this.entityChanged$.next(newEntity);
+    }
 }