Delete from entities map

src/lib/services/entities-map.service.ts

@@ -10,13 +10,16 @@ export abstract class EntitiesMapService<E extends Entity<I>, I> {
     private readonly _entityChanged$ = new Subject<E>();
     private readonly _entityDeleted$ = new Subject<E>();
 
-    protected constructor(@Inject('ENTITY_PRIMARY_KEY') protected readonly _primaryKey: string) {
-    }
+    protected constructor(@Inject('ENTITY_PRIMARY_KEY') protected readonly _primaryKey: string) {}
 
     get empty(): boolean {
         return this._map.size === 0;
     }
 
+    delete(keys: string[]): void {
+        keys.forEach(key => this._map.delete(key));
+    }
+
     get$(key: string) {
         if (!this._map.has(key)) {
             this._map.set(key, new BehaviorSubject<E[]>([]));