Json circular reference and 'Children could not be evaluated' on Linq Include - asp.net-mvc

Question

The following JsonResult returns:
A circular reference was detected while serializing an object of type 'System.Data.Entity.DynamicProxies.IntegerList_76C57D0878505062AEA67E9EB9F708830FA20FDE4F13A53543EC2E6ED84C1A2C'
and according to the debugger
'Children could not be evaluated'
for the line
var integerLists = db.IntegerLists.Include("Integers");
If I remove the include, this runs successfully. Likewise if I execute the commented code instead.
In the past, I've solved circular references by decorating my domain models with [IgnoreDataMember] but that doesn't seem to be working this time.
Controller
public JsonResult GetIntegerLists()
{
var integerLists = db.IntegerLists.Include("Integers");
//var integerLists = new List<IntegerList>();
//integerLists.Add(new IntegerList()
//{
// IntegerListID = 1,
// Direction = "Ascending",
// Performance = 467,
// Integers = { new Integer { IntegerValue = 34 }, new Integer { IntegerValue = 5654 }, new Integer { IntegerValue = 343 } }
//});
//integerLists.Add(new IntegerList()
//{
// IntegerListID = 2,
// Direction = "Ascending",
// Performance = 637,
// Integers = { new Integer { IntegerValue = 4 }, new Integer { IntegerValue = 646 }, new Integer { IntegerValue = 23 } }
//});
//integerLists.Add(new IntegerList()
//{
// IntegerListID = 3,
// Direction = "Ascending",
// Performance = 235,
// Integers = { new Integer { IntegerValue = 64378 }, new Integer { IntegerValue = 1 }, new Integer { IntegerValue = 533 } }
//});
return Json(integerLists, JsonRequestBehavior.AllowGet);
}
[HttpPost]
public ActionResult Index(IntegerList viewModel)
{
if (ModelState.IsValid)
{
db.IntegerLists.Add(viewModel);
db.SaveChanges();
}
return View();
}
Models
public class Integer
{
public int IntegerID { get; set; }
public int IntegerValue { get; set; }
public int IntegerListID { get; set; }
public virtual IntegerList IntegerList { get; set; }
}
public class IntegerList
{
public int IntegerListID { get; set; }
public string Direction { get; set; }
public long Performance { get; set; }
public virtual ICollection<Integer> Integers { get; set; }
}

Answer 1

You have a navigation property back to the list it belongs to. You probably don't want to use that when serializing. Use the ScriptIgnore attribute.
public class Integer
{
public int IntegerID { get; set; }
public int IntegerValue { get; set; }
public int IntegerListID { get; set; }
[ScriptIgnore]
public virtual IntegerList IntegerList { get; set; }
}