Django custom queryset returns nothing - django

Question

I am trying to write a year level filter for my student profile list, however, the query returns an empty [].
This is my Attendance model, manager and custom queryset:
class AttendanceQuerySet(models.QuerySet):
def get_yearlevel(self, yearlevel):
return self.filter(BCEID__YearLevel = yearlevel)
class AttendanceManager(models.Manager):
def get_queryset(self):
return AttendanceQuerySet(self.model, using=self._db)
def get_yearlevel(self, yearlevel):
return self.get_queryset().get_yearlevel(yearlevel)
class Attendance(models.Model):
BCEID = models.OneToOneField(StudentProfile,primary_key=True,on_delete=models.CASCADE)
AttendanceRate = models.CharField(max_length=10)
objects = AttendanceManager()
def __unicode__(self):
return self.BCEID
StudentProfile model:
class StudentProfile(models.Model):
RelatedPersonName = models.CharField(max_length=10)
RelatedPersonFirstName = models.CharField(max_length=30)
RelatedPersonFamName = models.CharField(max_length=30)
StudentLegalName = models.CharField(max_length=30)
StudentFamName = models.CharField(max_length=30)
Email = models.CharField(max_length=130)
Street1 = models.TextField(max_length=30)
Suburb = models.CharField(max_length=30)
State = models.CharField(max_length=5)
PostCode = models.CharField(max_length=6)
StudentLegalName = models.CharField(max_length=30)
StudentFamName = models.CharField(max_length=30)
StudentNo = models.CharField(primary_key=True,max_length=10)
Class = models.CharField(max_length=6)
YearLevel = models.CharField(max_length=10)
objects = StudentProfileManager()
def __unicode__(self):
return self.StudentNo
and AttendanceListView (views.py)
class AttendanceListView(ListView):
model = Attendance
queryset = Attendance.objects.get_yearlevel("Year 8")
I manually queried the database to check if there were errors in my code, and got the same result: an empty array [].
SQL:
SELECT "student_attendance"."BCEID_id",
"student_attendance"."AttendanceRate"
FROM "student_attendance"
INNER JOIN "student_studentprofile"
ON ("student_attendance"."BCEID_id" = "student_studentprofile"."StudentNo")
WHERE "student_studentprofile"."YearLevel" = 'Year 8'
Please let me know what I am doing wrong here.