diff --git a/src/lib/services/entities-map.service.ts b/src/lib/services/entities-map.service.ts
index 031e557..44ee10c 100644
--- a/src/lib/services/entities-map.service.ts
+++ b/src/lib/services/entities-map.service.ts
@@ -12,6 +12,10 @@ export abstract class EntitiesMapService<E extends Entity<I>, I> {
 
     protected constructor(@Inject('ENTITY_PRIMARY_KEY') protected readonly _primaryKey: string) {}
 
+    get empty(): boolean {
+        return this._map.size === 0;
+    }
+
     get$(key: string) {
         if (!this._map.has(key)) {
             this._map.set(key, new BehaviorSubject<E[]>([]));
@@ -20,8 +24,8 @@ export abstract class EntitiesMapService<E extends Entity<I>, I> {
         return this._getBehaviourSubject(key).asObservable();
     }
 
-    has(dossierId: string) {
-        return this._map.has(dossierId);
+    has(parentId: string) {
+        return this._map.has(parentId);
     }
 
     get(key: string): E[];