NHibernate错误 - “无法初始化集合”

Question

我有多对一的映射工作正常，但位置和location_times之间的一对多关系一直给我一个错误。

我一直收到这个错误：

在这行代码上：

映射看起来像这样：

位置：

public virtual IList<LocationTimes> LocationTimes { get; set; }

    public virtual int locationID { get; set; }
    public virtual IList<LocationTimes> LocationTimes { get; set; }

    public Location()
    {
        LocationTimes = new List<LocationTimes>();
    }

位置图：

 public class LocationMap : ClassMap<Location>
 {
    public LocationMap()
    {
        Table("Locations");

        Id(x => x.locationID).Column("ID");    

        HasMany(x => x.LocationTimes)
          .Inverse()
          .Cascade.All();   

位置表：

CREATE TABLE [dbo].[Locations](
    [ID] [int] IDENTITY(1,1) NOT NULL
    ...
    CONSTRAINT [PK_Locations_1] PRIMARY KEY CLUSTERED 
    (
        [ID] ASC
    )WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF,     ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

LocationTimes：

public class LocationTimes
{
    public virtual int ID { get; set; }
    public virtual Location Location { get; set; }   
}

LocationTimesMap：

public class LocationTimesMap : ClassMap<LocationTimes>
{
    public LocationTimesMap()
    {
        Table("Location_Times");

        Id(x => x.ID);
        References(x => x.Location).Column("LID"); 
    }
}

Location_times表：

CREATE TABLE [dbo].[Location_Times](
[ID] [int] IDENTITY(1,1) NOT NULL,
[LID] [int] NULL,
    [EHStart] [int] NULL,
[EHEnd] [int] NULL,
    [EHSell] [money] NULL,
    CONSTRAINT [PK_Location_Times_1] PRIMARY KEY CLUSTERED 
    (
    [ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

完整的错误消息：

  

“{”无法初始化集合：[WhygoDomain.Location.LocationTimes＃4]   [SQL：SELECT locationti0_.Location_id为Location4_1_，locationti0_.ID为ID1_，locationti0_.ID为ID1_0_，locationti0_.LID为LID1_0_，locationti0_.EHStart为EHStart1_0_   FROM Location_Times locationti0_   在哪里locationti0_.Location_id =？]“}”

我可以从错误消息中的sql看到它确实在寻找locationti0_.Location_id，我知道它不存在。我不知道为什么它正在寻找那个。

Answer 1

这通常是您的表上ID名称不匹配的问题。检查以确保Location在表上有一个ID列，并且它符合您的约定或正确映射。您不共享位置的地图，完整对象图或任何表，因此很难分辨ID的命名以及它们是否正确匹配。

修改

根据RichardD在评论中的回答，修改LocationMap如下：

public class LocationMap : ClassMap<Location>
 {
    public LocationMap()
    {
        Table("Locations");
        Id(x => x.locationID).Column("ID");
        HasMany(x => x.LocationTimes).KeyColumn("LID").Inverse().Cascade.All();