實體框架代碼第一外鍵映射

Question

我有2個實體：

• 權利要求（ID，其它primirives，多了一個關係） - 權利要求表
• ClaimDetail（ID，ClaimID的，其他原語，關係） - ClaimDetails 表

映射：

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

甲屬泰德查詢：

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 

如果我離開了映射，然後EF會生成一個名爲Claim_ID1另一列。這有什麼問題？我應該如何定義關係？

編輯

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; } 
} 

Answer 1

上面沒有一個接口實現。在那個接口中有一個返回一個Collection的屬性。 [NotMapped]屬性缺失，現在可用於關聯。

Answer 2

如何嘗試一些簡單的與Property mapping而非Fluent API mapping;

public class Claim 
{ 
    [Key] 
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)] 
    public int ClaimId { get; set; } 
    public string Name { get; set; } 

    public virtual ICollection<ClaimDetail> ClaimDetails { get; set; } 
} 

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

    [ForeignKey("Claim"), DatabaseGenerated(DatabaseGeneratedOption.None)] 
    public int ClaimId { get; set; } 

    public string Detail { get; set; } 

    public virtual Claim Claim { get; set; } 
} 

流利的API映射應該是;

modelBuilder.Entity<Claim>() 
    .HasMany(c => c.ClaimDetail) 
    .WithOptional() 
    .Map(m => m.MapKey("ClaimId"));