исправление ошибок

Atelier/Atelier/Repositories/Implementations/OrderRepository.cs

@@ -36,12 +36,12 @@ SELECT MAX(Id) FROM Orders";
             connection.QueryFirst<int>(queryInsert, order, transaction);
             var querySubInsert = @"
 INSERT INTO ModelOrder (OrderId, ModelId, Count)
-VALUES (@OrderId,@ModelId, @Count)";
+VALUES (@OrderId, @ModelId, @Count)";
             foreach (var elem in order.ModelOrder)
             {
                 connection.Execute(querySubInsert, new
                 {
-                    orderId,
+                    OrderId = orderId,
                     elem.ModelId,
                     elem.Count
                 }, transaction);
@@ -61,20 +61,31 @@ VALUES (@OrderId,@ModelId, @Count)";
         _logger.LogDebug("Объект: {id}", id);
         try
         {
-            using var connection = new
+            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
-            NpgsqlConnection(_connectionString.ConnectionString);
+            connection.Open();
-            var queryDelete = @"
+            using var transaction = connection.BeginTransaction();
+
+            // Сначала удаляем связанные записи в таблице ModelOrder
+            var queryDeleteModelOrder = @"
+DELETE FROM ModelOrder
+WHERE OrderId=@id";
+            connection.Execute(queryDeleteModelOrder, new { id }, transaction);
+
+            // Затем удаляем запись в таблице Orders
+            var queryDeleteOrder = @"
 DELETE FROM Orders
 WHERE Id=@id";
-            connection.Execute(queryDelete, new { id });
+            connection.Execute(queryDeleteOrder, new { id }, transaction);
+
+            transaction.Commit();
         }
         catch (Exception ex)
         {
             _logger.LogError(ex, "Ошибка при удалении объекта");
             throw;
         }
-
     }
+
     public IEnumerable<Order> ReadOrders(int? id = null, DateTime?dateForm = null, DateTime? dateTo = null,
         Status? status = null, int? clientId = null)
     {