Question

So I’m going to use the cliché example of a blogging database model with posts and comments.

public class Post {
  public int Id { get; set; }
  public string Title { get; set; }
  public string Body { get; set; }
  public virtual ICollection<Comment> Comments { get; set; }
}

public class Comment {
  public int Id { get; set; }
  public string Body { get; set; }
  public virtual Post Post { get; set; }
}

Of course, Post has a one-to-many relationship with Comment.

If I let Entity Framework create the database for me, it will add a Post_Id column to the Comments table. I would like to have the column named PostId instead, but I don’t want to add a PostId property to my Comments class. Is there a way to achieve this via DataAnnotations, DbModelBuilder, migrations, something else I don’t know about?

I apologize if this has already been answered, but I haven’t been able to find it on SO or even Google. Thanks.

Answer 1

And right after I post this, I find the answer.

Declare this method on the class derived from DbContext.

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
  modelBuilder.Entity<Comment>()
    .HasRequired(t => t.Post)
    .WithMany(t => t.Comments)
    .Map(m => m.MapKey("PostId"));
}