一对一关系Entity Framework外键映射

Question

I am working on assigning a relationship between two objects but I am getting an error on the mapping.

I have the following objects:

public abstract class EntityBase : IEntity
{
    public int Id { get; set; }
}

public class ManagerUser : EntityBase
{
    public string UserCode { get; set; }
    public string Title { get; set; }
    public virtual Staff StaffDetails { get; set; }
}

public class Staff : EntityBase
{
    public string UserCode { get; set; }
    public string DOB { get; set; }
}

public class ManagerUserMap : EntityMapBase<ManagerUser>
{
    protected override void SetupMappings()
    {
        base.SetupMappings();
        //this.HasKey(t => t.UserCode);
        this.ToTable("ManagerUsers");
        this.Property(t => t.Id).HasColumnName("ManagerUsersID")
        .HasDatabaseGeneratedOption(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity);
        this.Property(t => t.Title).HasColumnName("txtTitle");
        this.HasRequired(x => x.StaffDetails)
            .WithMany()
            .HasForeignKey(x => x.UserCode);
    }
}

public class StaffMap : EntityMapBase<Staff>
{
    protected override void SetupMappings()
    {
        base.SetupMappings();
        //this.HasKey(t => t.UserCode);
        this.ToTable("TblStaff");
        this.Property(t => t.Id).HasColumnName("StaffID")
        .HasDatabaseGeneratedOption(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity);
        this.Property(t => t.UserCode).HasColumnName("User_Code");
        this.Property(t => t.DateOfBirth).HasColumnName("dob");
    }
}

I am getting the following error:

The type of property 'UserCode' on entity 'ManagerUser' does not match the type of property 'Id' on entity 'Staff' in the referential constraint 'ManagerUser_StaffDetails'

I have searched around and failed to find a solution to get it to compare the the foreign key in ManagerUser with the UserCode property in Staff instead of the ID property.

Answer 1

Your keys are a bit messed up in the fluent config, HasKey sets the primary key for the entity. Below I have set the primary key to be Id for both entities. Then use the Usercode as a FK:

    public class ManagerUserMap : EntityMapBase<ManagerUser>
    {
        protected override void SetupMappings()
        {
            base.SetupMappings();
            this.HasKey(t => t.Id);
            this.ToTable("ManagerUsers");
            this.Property(t => t.Id).HasColumnName("ManagerUsersID")
            .HasDatabaseGeneratedOption(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity);
            this.Property(t => t.Title).HasColumnName("txtTitle");
            this.HasRequired(x => x.StaffDetails)
                .WithMany()
                .HasForeignKey(x => x.UserCode);
        }
    }

    public class StaffMap : EntityMapBase<Staff>
    {
        protected override void SetupMappings()
        {
            base.SetupMappings();
            this.HasKey(t => t.Id);
            this.ToTable("TblStaff");
            this.Property(t => t.Id).HasColumnName("StaffID")
            .HasDatabaseGeneratedOption(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity);
            this.Property(t => t.UserCode).HasColumnName("User_Code");
            this.Property(t => t.DateOfBirth).HasColumnName("dob");
        }
    }