我有一个父子实体:
public class Transaction
{
public int TransactionId {get; set;}
public int? OrderId {get; set;}
public virtual Order Order {get; set;}
}
public class Order
{
public int Id {get; set;}
public virtual List<OrderItems> OrderItems {get; set;}
}
public class OrderItem
{
public int Id {get; set;}
public string Item {get; set;}
public virtual int OrderId {get; set;}
public virtual Order Order {get; set;}
}
上下文如下:
modelBuilder.Entity<Transaction>( )
.HasKey( x => x.TransactionId )
.ToTable( "Transactions" );
modelBuilder.Entity<Transaction>( )
.HasOptional( x => x.Order )
.WithMany( )
.HasForeignKey( t => t.OrderId );
modelBuilder.Entity<Order>( )
.HasKey( o => o.Id )
.ToTable("Orders");
modelBuilder.Entity<OrderItem>( )
.HasKey( i => i.Id )
.ToTable( "OrderItems" );
modelBuilder.Entity<OrderItem>( )
.HasRequired( x => x.Order )
.WithMany( o => o.OrderItems )
.HasForeignKey( p => p.OrderId );
当我尝试创建一个类型为Transaction的新实体时,类似于:
var transaction = new Transaction
{TransactionId = Guid.NewGuid;
Order = new Order {OrderItems = new List<OrderItems>{Item="SunCream"}}};
和
ctx.Transactions.Add(transaction);
ctx.SaveChanges();
我得到了
INSERT语句与FOREIGN KEY约束冲突 “FK_Transactions_Orders_OrderId”。冲突发生在数据库中 “交易”,表“dbo.Orders”,列“Id”。
我到底错在了什么?
答案 0 :(得分:1)
我认为您需要在添加事务之前先将Order对象显式添加到ctx对象。这样,当您调用.SaveChanges()
上下文时,它将知道它必须在您提交事务之前先提交订单。