Question

我有以下模型

public class FilanthropyEvent :  EntityBase, IDeleteable
{  
    public int Id { get; set; }
    public string Name { get; set; }
    public DateTime EventDate { get; set; }
    public string Description { get; set; }
    public decimal Target { get; set; }
    public decimal EntryFee { get; set; }
    public bool Deleted { get; set; }

    public ICollection<EventAttendee> EventAttendees { get; set; }
}

public class Attendee : EntityBase, IDeleteable
{
    public int Id { get; set; }
    public string Email { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public bool MailingList { get; set; }
    public bool Deleted { get; set; }

    public ICollection<EventAttendee> EventAttendees { get; set; }
}

事件和与会者是多对多的关系，但我需要关联的另一个属性，所以我创建了一个关联实体

 public class EventAttendee : EntityBase
 {
    public int FilanthropyEventId { get; set; }
    public int AttendeeId { get; set; }
    public bool InActive { get; set; }

    public virtual Attendee Attendee { get; set; }
    public virtual FilanthropyEvent FilanthropyEvent { get; set; }
 }

这些是每个FilanthropyEvent和参加者的配置

public class FilanthropyEventConfiguration : EntityTypeConfiguration<FilanthropyEvent>
{
       public FilanthropyEventConfiguration()
       {
           HasKey(x => x.Id);
           Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

           HasMany(x => x.EventAttendees).WithRequired(x =>      x.FilanthropyEvent).HasForeignKey(x => x.FilanthropyEvent);
       }
}

public AttendeeConfiguration()
{
        HasKey(x => x.Id);
        Property(x => x.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

        HasMany(x => x.EventAttendees).WithRequired(x => x.Attendee).HasForeignKey(x => x.AttendeeId);
}

public class EventAttendeesConfiguration : EntityTypeConfiguration<EventAttendee>
{
    public EventAttendeesConfiguration()
    {
        HasKey(x => new {x.FilanthropyEventId, x.AttendeeId});
    }
}

当我尝试通过包管理器控制台中的update-database命令初始化数据库时，出现以下错误。

System.InvalidOperationException：外键组件＆＃39; FilanthropyEvent＆＃39;不是类型＆＃39; EventAttendee＆＃39;的声明属性。验证它是否未从模型中明确排除，并且它是有效的原始属性。

我意识到我可能错过了EventAttendeesConfiguration类中的映射，但是建立这种关系的正确映射是什么？

Answer 1

此代码

HasMany(x => x.EventAttendees)
.WithRequired(x => x.FilanthropyEvent)
.HasForeignKey(x => x.FilanthropyEvent);

应该是

HasMany(x => x.EventAttendees)
.WithRequired(x => x.FilanthropyEvent)
.HasForeignKey(x => x.FilanthropyEventId);

实体框架 - 外键组件...不是类型的声明属性

1 个答案: