Many to many with extra foreign key? - asp.net

Question

I want to generate a junction table between user and post and I want to have the userId in the post table.
I have this code
public class Post
{
public Post()
{
this.ApplicationUser = new HashSet<ApplicationUser>();
}
public int PostId { get; set; }
public string Message { get; set; }
public DateTime MessageDate { get; set; }
public virtual ApplicationUser User { get; set; } //this is the problem
public virtual ICollection<ApplicationUser> ApplicationUser { get; set; }
}
public class ApplicationUser : IdentityUser
{
public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
{
// Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
// Add custom user claims here
return userIdentity;
}
public ApplicationUser()
{
this.Posts = new HashSet<Post>();
}
public virtual ICollection<Post> Posts { get; set; }
}
I get the extra junction table and many-to-many relation between user and post. But this is wrong.
public virtual ApplicationUser User { get; set; }
This generates two UserId in the post table (applicationUser_id and User_id) and Post_PostId in the User table. I just want one extra field in the Post table, FK UserId.
I want three tables like this
Post
PostId
Message
Date
UserId FK
User
UserId
And the rest of the fields in asp.net identity user
UserPosts
UserId
PostId

Answer 1

User table
public partial class User
{
public User()
{
this.Posts = new HashSet<Post>();
this.UserPosts = new HashSet<UserPost>();
}
public int UserId { get; set; }
public string Username { get; set; }
public virtual ICollection<Post> Posts { get; set; }
public virtual ICollection<UserPost> UserPosts { get; set; }
}
Post table
public partial class Post
{
public Post()
{
this.UserPosts = new HashSet<UserPost>();
}
public int PostId { get; set; }
public string Message { get; set; }
public Nullable<System.DateTime> Date { get; set; }
public Nullable<int> UserId { get; set; }
public virtual User User { get; set; }
public virtual ICollection<UserPost> UserPosts { get; set; }
}
and your mapping table, like this
your column 1) Id (pk), 2) UserId (fk) 3) PostId (fk)
using entity framework table have one primary key necessary.
UserPost table
public partial class UserPost
{
public int Id { get; set; }
public Nullable<int> UserId { get; set; }
public Nullable<int> PostId { get; set; }
public virtual Post Post { get; set; }
public virtual User User { get; set; }
}
Updated Code
modelBuilder.Entity<Post>().ToTable("userid table name");
this line add in below method of this class ApplicationDbContext
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
}