protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
// The default behaviour for the one (Manufacturer) to many (Vehicles)
// association is "cascade delete"
// This means that deleting a Manufacturer will cause the Vehicles to be deleted
// In this code example, we do NOT want that behaviour
// We cannot do this with a data annotation
// We must use this Fluent API
// First, call the base OnModelCreating method,
// which uses the existing class definitions and conventions
base.OnModelCreating(modelBuilder);
// Then, change the "cascade delete" setting
// This can be done in at least two ways; un-comment the desired code
// Alternative #1
// Turn off "cascade delete" for all default convention-based associations
modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
// Alternative #2
// Turn off "cascade delete" for a specific association
//modelBuilder.Entity<Vehicle>()
// .HasRequired(m => m.Manufacturer)
// .WithMany(v => v.Vehicles)
// .WillCascadeOnDelete(false);
}
