OnCascadeDelete and Entity Framework - asp.net-mvc-3

Question

I have a company model:
public class Company
{
public int Id { get; set; }
...
public virtual ICollection<Useraccount> Useraccounts { get; set; }
}
And a useraccount model:
public class Useraccount
{
public int Id { get; set; }
...
public virtual ICollection<Company> Companies { get; set; }
}
So it's a m:n connection:
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
modelBuilder.Entity<Company>()
.HasMany(c => c.Useraccounts).WithMany(i => i.Companies)
.Map(t => t.MapLeftKey("CompanyId")
.MapRightKey("UseraccountId")
.ToTable("UseraccountCompany"));
}
However an exception is thrown when initializing the database.
With
modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
the initialization is working.
I'd like to keep the cascade on delete but I'm not sure how to manage it.
I also would like to keep both virtual properties so I can access the useraccounts from a company and the companies from the useraccount.
The exception btw is:
Introducing FOREIGN KEY constraint 'Company_Useraccounts_Target' on table
'UseraccountCompany' may cause cycles or multiple cascade paths.
Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify
other FOREIGN KEY constraints.Could not create constraint.

Answer 1

That should work (you probably haven't posted some relevant bits in your model - fluent configuration).
That usually appears when you have some 'self-referencing' entities
(either directly or indirectly) - but I don't see that here, this is
typical many-to-many.
But if problems persist you can always implement the join table yourself - with more control over cascading - and that usually solves the problems (if possible).
I hate to retype :) - here is almost the exact problem - with many-to-many manually done (part-2).
EF5 And cycles or multiple cascade paths, FOREIGN KEY
Take a look and see if it helps.