add unsaled cars filtration

CarShowroom/CarShowroomDataModels/SearchModel/CarSearch.cs

@@ -9,5 +9,6 @@ namespace CarShowroomDataModels.SearchModel
     public class CarSearch
     {
         public int? Id;
+        public bool? IsSaled;
     }
 }

CarShowroom/CarShowroomDatabaseStorage/Storages/CarStorage.cs

@@ -34,7 +34,9 @@ namespace CarShowroomDatabaseStorage.Storages
             return context.Cars
                 .Include(c => c.Model)
                 .ThenInclude(m => m.Make)
-                .Where(x => !model.Id.HasValue || x.Id == model.Id)
+                .Where(x => 
+                    !model.Id.HasValue || x.Id == model.Id &&
+                    (!model.IsSaled.HasValue || x.IsSaled == model.IsSaled))
                 .Select(x => x.GetView())
                 .ToList();
         }

CarShowroom/CarShowroomRestApi/Controllers/CarController.cs

@@ -24,7 +24,10 @@ namespace CarShowroomRestApi.Controllers
         {
             try
             {
-                return _logic.ReadList(null);
+                return _logic.ReadList(new CarSearch
+                {
+                    IsSaled = false,
+                });
             }
             catch (Exception ex)
             {