我有2个型号,用户&电话。用户可以拥有多个电话号码。
我的用户代码:
public class User
{
public User()
{
this.TelephoneNumbers = new List<Telephone>();
}
public int UserId { get; set; }
public string Forename { get; set; }
public string Surname { get; set; }
public string FirstLine { get; set; }
public string Town { get; set; }
public string County { get; set; }
public string Postcode { get; set; }
public string Email { get; set; }
public int TravelDistance { get; set; }
//[Display (Name = "Full Name")]
public string FullName
{
get { return Forename + " " + Surname; }
}
//List to store telephone numbers for the users
public virtual ICollection<Telephone> TelephoneNumbers { get; set; }
}
我的电话代码:
public class Telephone
{
public int TelephoneId { get; set; }
public string TelephoneNumber { get; set; }
//Used to get UserId from User table
public int UserId { get; set; }
public virtual User User { get; set; }
}
用户映射:
public class UserMap : EntityTypeConfiguration<User>
{
public UserMap()
{
//Table Mapping
this.ToTable("User");
//Primary Key
this.HasKey(u => u.UserId);
//Properties
this.Property(u => u.UserId)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
this.Property(u => u.Forename)
.IsRequired();
this.Property(u => u.Surname)
.IsRequired();
}
}
TelephoneMap
public class TelephoneMap : EntityTypeConfiguration<Telephone>
{
public TelephoneMap()
{
//Table Mapping
this.ToTable("Telephone");
//Primary Key
this.HasKey(t => t.TelephoneId);
//Properties
this.Property(t => t.TelephoneId)
.HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
this.Property(t => t.TelephoneNumber)
.IsRequired();
//Relationship
//FK_Telephone_User
//One to many relationship between user & telephone
//One User has an iCollection of Telephone numbers
this.HasRequired(t => t.User)
.WithMany(t => t.TelephoneNumbers)
.HasForeignKey(t => t.UserId);
}
}
我已经运行了Add-Migration init,然后运行了Update-Database。
我收到以下错误:
System.Data.SqlClient.SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_dbo.Telephone_dbo.User_UserId". The conflict occurred in database "API_Context-20150311183614", table "dbo.User", column 'UserId'
我认为这与我的电话模型中的UserId有关?当我为数据库播种时,我不需要将它们连接在一起吗?
答案 0 :(得分:0)
是的,你这样做。电话号码通过外键链接到用户。您需要通过指定用户的ID来指定其电话号码。您的约束被破坏的事实是由以下可能原因之一引起的:
无论如何,如果我们谈论电话号码和用户,对我来说似乎难以置信,以防止错误,因为我没有看到任何使用没有链接到用户的电话号码,但是,我不太了解因此,关于你的项目,我的直觉可能是错误的。因此,您可以通过使外键可以为空来解决问题,但这似乎是错误的方法。相反,我认为您的代码应始终指定有效的电话号码。