Mapping many to many relationship

Question

I am have some trouble getting Entity Framework to handle a many to many relationship in my data schema. Here is my model:

public class User
{
    public int Us         


        

Answer 1

For your model you will need probably two one-to-many relationships and the following navigation properties:

public class User
{
    public int UserId { get; set; }
    public int Username { get; set; }
    // ...
    public ICollection CustomerUsers { get; set; }
}

public class Customer
{
    public int CustomerId { get; set; }
    //...
    public ICollection CustomerUsers { get; set; }
}

public class CustomerUser
{
    public int CustomerUserId { get; set; }
    public int CustomerId { get; set; }
    public int UserId { get; set; }
    public DateTime CreatedTimestamp { get; set; }
    //...
    public User User { get; set; }
    public Customer Customer { get; set; }
}

And the following mapping:

modelBuilder.Entity()
    .HasRequired(cu => cu.User)
    .WithMany(u => u.CustomerUsers)
    .HasForeignKey(cu => cu.UserId);

modelBuilder.Entity()
    .HasRequired(cu => cu.Customer)
    .WithMany(c => c.CustomerUsers)
    .HasForeignKey(cu => cu.CustomerId);