Question

我有两个类User和Appointment，它们以前以多对多关系链接。但是现在我必须能够管理这种关系的状态（我需要能够跟踪用户是接受约会还是被拒绝还是尚未响应）。

这些类映射到各自的表“用户”和“约会”。这两个表都是通过UserAppointments表连接的，该表具有复合主键，包括用户的fk和约会的fk。

当我尝试将新的UserAppointment对象添加到约会对象的集合中时，当前实现会引发异常消息：“ 此SqlParameterCollection的索引2无效，计数为2。” >

用户映射

 public class UserMap : ClassMap<User>
    {
        public UserMap()
        {
            Id(d => d.Id);
            Map(d => d.FirstName).Column("FirstName");
            Map(d => d.LastName).Column("LastName");
            Map(d => d.Email).Column("Email");            
            HasMany(u => u.UserAppointments);  
            Table("Users");

        }
    }

约会映射

public class AppointmentMap : ClassMap<Appointment>
    {
        public AppointmentMap()
        {
            Id(c => c.Id);
            HasMany(a => a.AppointmentParticipants).Inverse().Cascade.All();
            References(a => a.Location).Column("FkAddressId");
            Map(a => a.DateAndTime).Column("AppointmentDate").CustomType<UtcDateTimeType>();
            Map(a => a.Description).Column("AppointmentDescription");
            Map(a => a.Status).Column("AppointmentStatus").CustomType<AppointmentStatus>();
            HasMany(a => a.AppointmentEstates).Inverse().Cascade.All();
            Table("Appointments");
        }

UserAppointments映射

public class UserAppointmentsMap : ClassMap<UserAppointment>
    {
        public UserAppointmentsMap()
        {
            CompositeId()
                .KeyReference(a => a.Appointment, "FkAppointmentsId")
                .KeyReference(u => u.User, "FkUserId");
            References(a => a.User).Column("FkUserId");
            References(a => a.Appointment).Column("FkAppointmentsId");
            Table("UserAppointments");
        }
    }

预期结果是，当我向现有约会的集合中添加新的UserAppointment时，将在UserAppointments表中创建一个指向相关User和Appointment实体的新记录

Answer 1

我终于设法解决了这个问题。...实际上我的代码有几个问题：

“此Count = 2的SqlParameterCollection的无效索引2。” 的问题是由UserAppointmentsMap引起的。一旦将属性定义为组合键的一部分，就不应再次将其映射为引用。

public class UserAppointmentsMap : ClassMap<UserAppointment>
{
    public UserAppointmentsMap()
    {
        CompositeId()
            .KeyReference(a => a.Appointment, "FkAppointmentsId")
            .KeyReference(u => u.User, "FkUserId");
        Table("UserAppointments");
    }
}

带有外键的复合ID应该使用KeyReference代替KeyProperty

我遇到了错误生成的查询的问题（外键错误，即不是FkAppointmentsId，而是在寻找Appointments_Id），所以我必须明确指定列名

public class AppointmentMap : ClassMap<Appointment>
{
    public AppointmentMap()
    {
        Id(c => c.Id);
        HasMany(a => a.AppointmentParticipants).Inverse().KeyColumn("FkAppointmentsId").Cascade.All();
        References(a => a.Location).Column("FkAddressId");
        Map(a => a.DateAndTime).Column("AppointmentDate").CustomType<UtcDateTimeType>();
        Map(a => a.Description).Column("AppointmentDescription");
        Map(a => a.Status).Column("AppointmentStatus").CustomType<AppointmentStatus>();
        HasMany(a => a.AppointmentEstates).Inverse().KeyColumn("FkAppointmentsId").Cascade.All();
        Table("Appointments");
    }
}

将多对多转换为亲子关系

1 个答案: