实体框架代码优先外键映射 [英] Entity Framework Code first foreign key mapping

问题描述

我有两个实体：

• 索赔(ID，其他原语，多一个关系)-索赔表
• ClaimDetail(ID，ClaimID，其他原语，关系)-ClaimDetail 表

映射：

modelBuilder.Entity<Claim>()
                        .HasMany(x => x.ClaimDetails)
                        .WithRequired(x => x.Claim)
                        .HasForeignKey(x => x.ClaimID)

生成的查询：

exec sp_executesql N'SELECT 
[Extent1].[ID] AS [ID], 
[Extent1].[ClaimID] AS [ClaimID], 
[Extent1].[UserID] AS [UserID], 
[Extent1].[ClaimTypeID] AS [ClaimTypeID], 
[Extent1].[PermissionID] AS [PermissionID], 
[Extent1].[StartDate] AS [StartDate], 
[Extent1].[EndDate] AS [EndDate], 
[Extent1].[Justification] AS [Justification], 
[Extent1].[Claim_ID] AS [Claim_ID]
FROM  [dbo].[ClaimDetails] AS [Extent1]
OUTER APPLY  (SELECT TOP (1) [Project1].[ClaimDetailStatusID] AS [ClaimDetailStatusID]
    FROM ( SELECT 
        [Extent2].[ClaimDetailStatusID] AS [ClaimDetailStatusID], 
        [Extent2].[CreatedOn] AS [CreatedOn]
        FROM [dbo].[ClaimDetailStatus] AS [Extent2]
        WHERE [Extent1].[ID] = [Extent2].[ClaimDetailID]
    )  AS [Project1]
    ORDER BY [Project1].[CreatedOn] DESC ) AS [Limit1]
WHERE ([Extent1].[UserID] = @p__linq__0) AND ( NOT ([Limit1].[ClaimDetailStatusID] IN (12,11,4,7,13,10)))',N'@p__linq__0 int',@p__linq__0=4106

如果我省略了映射，那么EF将生成另一个名为Claim_ID1的列。这有什么不对的？我应该如何定义关系？

编辑

public class Claim
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ID { get; set; }
    [Required]
    public int SenderID { get; set; }

    [NotMapped]
    public UserModel Sender { get; set; } //TODO:

    [Required]
    public DateTime Created { get; set; }

    public string Note { get; set; }
    [Required]
    public int BossID { get; set; }

    [NotMapped]
    public UserModel Boss { get; set; } //TODO:

    public virtual IList<ClaimDetail> ClaimDetails { get; set; }
    public virtual IList<UserClaim> UserClaims { get; set; }
}

public class BaseClaimItem
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ID { get; set; }

    [Required]
    public int PermissionID { get; set; }

    [Required]
    public DateTime StartDate { get; set; }

    [Required]
    public DateTime EndDate { get; set; }

    public string Justification { get; set; }

    public virtual Permission Permission { get; set; }

    [NotMapped]
    public virtual UserModel Claimant { get; set; }
}


public class ClaimDetail : BaseClaimItem
{
    [Required]
    public virtual int ClaimID { get; set; }

    [Required]
    public int UserID {get;set;}

    [NotMapped]
    public override UserModel Claimant {get;set;}

    [Required, Range(1, 5)]
    public int ClaimTypeID { get; set; }

    public virtual Claim Claim { get; set; }
    public virtual IList<ClaimDetailStatus> ClaimDetailStatus { get; set; }
    public virtual IList<Task> Tasks { get; set; }
    public virtual IList<ClaimDetailApprovalStep> ClaimDetailApprovalSteps { get; set; }

    public virtual ClaimType ClaimType { get; set; }
}

推荐答案

上面缺少一个接口实现。在该接口中，有一个返回集合的属性。现在缺少[NotMaps]属性使关联生效。

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