asp.net-mvc – 实体框架TPC继承(请现在拍我)

迁移构建数据库,但任何种子数据库的尝试都失败.

一切都来自Thing：

namespace Entities.Models
    {
                public class Thing
                {
                    public Thing()
                    {            
                        Id = Guid.NewGuid();
                        Name = String.Empty;
                    }

                    public Guid           Id               { get; set; }
                    public virtual string Name             { get; set; }

                }

            public class Person : Thing
            {
                public Person()
                    : base()
                {
                    Friends = new List<Person>();
                }

                public string GivenName { get; set; }
                public string FamilyName { get; set; }
                public string Email { get; set; }

                public virtual ICollection<Person> Friends { get; set; }
            }

            public class Event : Thing
            {
                public Event()
                    : base()
                {
                    Attendees = new List<Person>();
                }

                public virtual ICollection<Person> Attendees { get; set; }
                public TimeSpan Duration { get; set; }
                public DateTime? endDate { get; set; }
                public DateTime? StartDate { get; set; }

            }

        public class ThingMap : EntityTypeConfiguration<Thing>
        {
            public ThingMap()
            {
                // Primary Key
                this.Property(t => t.Id)
                    .HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);

                // Properties
                this.Property(t => t.Name)
                    .IsOptional()
                    .HasMaxLength(200);

                // Table & Column Mappings
                this.ToTable("entity_Thing");
          }
       }
    public class PersonMap : EntityTypeConfiguration<Person>
    {
        public PersonMap()
        {
            // Properties
            this.Map<Person>(t =>
            {
                t.MapInheritedProperties();
                t.ToTable("entity_Person");
            });

            // Table & Column Mappings
        }
    }

    public class EventMap : EntityTypeConfiguration<Event>
    {
        public EventMap()
        {
            // Properties
            this.Map<Event>(t =>
            {
                t.MapInheritedProperties();
                t.ToTable("entity_Event");
            });

            // Table & Column Mappings
        }
    }

    public class CitriusSpotsContext : DbContext
    {
        static CitriusSpotsContext()
        {
            Database.SetInitializer<CitriusSpotsContext>(null);
        }

        public CitriusSpotsContext()
            : base("Name=CitriusSpotsContext")
        {
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new ThingMap());
            modelBuilder.Configurations.Add(new PersonMap());
            modelBuilder.Configurations.Add(new EventMap());
        }

        public DbSet<Thing> Things { get; set; }
        public DbSet<Person> People { get; set; }
        public DbSet<Event> Events { get; set; }
    }

}