One-to-one relationship EF database first

问题

I am having issues regarding one to one relationship in entity framework database first.

I have two tables, a user table and a user details table.

user would consist of login info, username, date registered and the userDetails would have information such as contact information, website, etc. In my database My user.id references userdetails.userId. Both are primary keys.

So for example..

User:
Id [Primary Key (incremented)]
Password
Salt
RegisteredDate

UserDetails
UserId [Primary Key (References User.Id)]
Firstname
Contact

My issue is I can add records through SQL Server but EF throws an exception.

How can I successfully create a one to one relationship in EF 6?

回答1:

Your UserDetails should be:

UserDetails
UserDetailId [Primary Key (incremented)]
UserId [Foreign Key (References User.Id)]
Firstname
Contact

You can create a UNIQUE INDEX on your foreign key

CREATE UNIQUE NONCLUSTERED INDEX [IX_UserId] ON [dbo].[UserDetails]
(
    [UserId] ASC
) ON [PRIMARY]

回答2:

Try with a model like this:

public class User
{
    public int Id { get; set; }
    //...

    //navigation property
    public UserDetail UserDetail { get; set; }
}

public class UserDetail
{
    [Key,ForeignKey("User")]
    public int UserId { get; set; }
    //...

    //navigation property
    public User User { get; set; }
}

This is using Data Annotation. If you want to use Fluent Api, you could override the OnModelCreating method on your Context this way:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    // Configure UserId as PK for UserDetail
    modelBuilder.Entity<UserDetail>()
        .HasKey(e => e.UserId);

    // Configure StudentId as FK for StudentAddress
    modelBuilder.Entity<User>()
                .HasOptional(u => u.UserDetail) // Mark UserDetail as optional for User
                .WithRequired(ud=> ud.User); // Create inverse relationship

}

Remember encrypt the password field.

来源：https://stackoverflow.com/questions/30452761/one-to-one-relationship-ef-database-first

标签

asp.net-mvc

entity-framework