Return entity with sub table collection - entity-framework

Question

Here is what I have:
public class StudentHealthInfoType
{
public int StudentHealthInfoId { get; set; }
public bool? HasAllergies { get; set; }
public List<HealthInfoMedicationType> HealthInfoMedicationType { get; set;}
}
public class HealthInfoMedicationType
{
public int HealthInfoMedicationId { get; set; }
public string MedicationName { get; set; }
}
var result = (from u in context.StudentHealthInfos
from m in context.HealthInfoMedications
where u.RegistrationId == registrationId
&& u.StudentHealthInfoId == m.StudentHealthInfoId
select new StudentHealthInfoType
{ StudentHealthInfoId = u.StudentHealthInfoId,
HasAllergies = u.HasAllergies, HealthInfoMedicationType = new HealthInfoMedicationType
{ HealthInfoMedicationId = m.HealthInfoMedicationId,
MedicationName = m.MedicationName
}
}).FirstOrDefault();
I get this error which is show at HealthInfoMedicationType = new HealthInfoMedicationType
Cannot implicitly convert type
'Dis.QueryManager.HealthFormTypes.HealthInfoMedicationType' to
'System.Collections.Generic.List'
HealthInfoMedicationType needs to be a collection of items returned for one StudentHealthInfoType record. How do I need to setup my objects and then cast them so this query works?

Answer 1

Please try this if you want to query for a particular registration id and list of HealthInfoMedications you can do like this .
var result = context.StudentHealthInfos
.Include(x=>x.HealthInfoMedicationType).FirstOrDefault(f => f.RegistrationId == 1);
// Result will be StudentHealthInfoType with list of HealthInfoMedicationType