How to add a foreign key reference to ASP.Net MVC 5 Identity?

Question

I have a new ASP.NET MVC 5.1 project using the ASP.Net Identity. It seems reliable and promise, but today i spend almost 9 hours to do a simple things if using SQL.

My p

Answer 1

You can do like this. because sometime you may need 1-1 connection

 public class AnotherTable
    {
        [Key]
        public string UserId { get; set; }

        [ForeignKey("UserId")]
        public virtual ApplicationUser User { get; set; }
    }

Answer 2

Thanks you Gábor Plesz for comment above.

I found the solution.

The ApplicationUser class who inherit IdentityUser (which create AspNetUsers table) should create a ICollection property of the child class (child table).

e.g.

public virtual ICollection<ToDo> ToDoes { get; set; }

So the ToDo class can be reference to ApplicationUser

Highly recommend have a look the sample as Gábor Plesz said.

Answer 3

If you really wanna create a table named Address instead of creating a property named Address to generated as a column into AspNetUsers table do the following (obs: in this case i am assuming that a user can have many address):

1. At your Address class:

   public class Address
   {
       public string MyAddress { get; set; }
   
       // referencing the AspNetUsers table ( ApplicationUser.cs)
       public string UserId { get; set; }
       public virtual ApplicationUser User { get; set; }
   }
   

2. Your ApplicationUser Class:

   public virtual ICollection<Address> Addresses { get; set; }
   

3. Within your DBContext in OnModelCreating method do the following ( fluent API ):

   builder.Entity<Address>()
                 .HasOne(c => c.User)
                 .WithMany(x => x.Addresses)
                 .HasForeignKey(f => f.UserId)
                 .HasConstraintName("UserId")
                 .OnDelete(DeleteBehavior.Cascade)
                 .IsRequired();
   

OBS: Don´t forget adding above the OnModelCreating method this line of code:

public DbSet<Address> Addresses { get; set; }

After it run those commands within your Package Manager Console:

Add-Migrations UserAddress

and after:

Update-Database. 

But, if you wanna just inclued a new property to the AspNet Users just create at your ApplicationUser.cs file/class this property:

public class ApplicationUser : IdentityUser
    {
        public string Address { get; set; }
    }

and run the same commands for your PMC:

Add-Migration UserAddress

after:

Update-Database

Hope this helps!