How to pass conditional attributes to template in Django ListView - django

Question

I'm trying to make a list of employees that each day contains information ("today_note") if they are present at work or are sick.
I had no problem to do this in Flask, I simply rendered a template as below:
def employees_list():
all_employees = Employee.query.order_by(Employee.name).all()
today = date.today()
for employee in all_employees:
today_sick = db.session.query(SickLeave).filter(SickLeave.start_date <= today).filter(
SickLeave.end_date >= today).filter(SickLeave.person_id == employee.id).all()
if len(today_sick) != 0:
employee.today_note = "C"
else:
employee.today_note = "✓"
return render_template("employees_list.html", all_employees=all_employees)
and could access today_note for each employee in the template:
{% for employee in all_employees %}
{{ employee.today_note }}
{% endfor %}
Now I need to do the same in django. I can't figure out how to pass today_note to each instance of User model to be able to display it in the template.
class AllEmployeesList(ListView):
template_name = "users/all_employees.html"
model = User
context_object_name = 'employees'
def get_context_data(self, **kwargs):
context = super(AllEmployeesList, self).get_context_data(**kwargs)
all_employees = User.objects.all()
today = date.today()
for employee in all_employees:
today_sick = Sickleave.objects.filter(Q(start_date__lte=today)&Q(end_date__gte= today)&Q(employee__id=employee.id)).all()
if len(today_sick) != 0:
employee.today_note = "C"
else:
employee.today_note = "✓"
return context
I'm aware that here I completely miss reference to context
Edit: here are models
class Sickleave(models.Model):
TYPE_CHOICES = (
('C', 'Sickleave'),
('O', 'Other'),
)
employee = models.ForeignKey(
settings.AUTH_USER_MODEL,
on_delete=models.CASCADE, related_name='sickemployee', default=""
)
type_name = models.CharField(max_length=10, choices=TYPE_CHOICES, default='C')
start_date = models.DateField(null=True)
end_date = models.DateField(null=True)
class User(AbstractBaseUser):
username = models.CharField('Username', max_length=15, unique=True)
email = models.EmailField('Email', null=True, blank=True)
first_name = models.CharField('First name', max_length=30)
last_name = models.CharField('Last name', max_length=50)
is_staff = models.BooleanField(default=False)
is_active = models.BooleanField(default=False)
is_superuser = models.BooleanField(default=False)
# (...)
USERNAME_FIELD = 'username'
objects = UserManager()
def has_perm(self, perm, obj=None):
return self.is_superuser
def has_module_perms(self, app_label):
return self.is_superuser
def get_full_name(self):
return self.first_name+" "+self.last_name
def __str__(self):
return self.first_name + " "+ self.last_name