added SyncManyToMany method

Luticate2.Utils/DataAccess/LuEfCrudDataAccess.cs

@@ -372,6 +372,18 @@ namespace Luticate2.Utils.DataAccess
 //            return EditSingleById(id, update, read => read);
 //        }
 
+        protected void SyncManyToMany<T>(IList<TId> ids, IList<T> verbs, Func<TId, T> newVerb, Func<T, TId> getVerbFk)
+        {
+            foreach (var added in ids.Where(id => verbs.FirstOrDefault(o => Equals(getVerbFk(o), id)) == null))
+            {
+                verbs.Add(newVerb(added));
+            }
+            foreach (var removed in verbs.Where(v => ids.FirstOrDefault(id => Equals(getVerbFk(v), id)) == null).ToList())
+            {
+                verbs.Remove(removed);
+            }
+        }
+
         protected virtual LuResult<bool> _EditSingleById(TModel model, TDboUpdate update, TDbContext db, DbSet<TModel> table)
         {
             return LuResult<bool>.Ok(true);