Django view function isnt working correctly - python-3.x

Question

so the basic goal of my project is to allow teachers and admin to login to the system and take attendance for the students. my new issue is that i have a view function that is suppose to check to see if students student is already added to the respective class and if they are it will exclude them from the drop down menu and display the students who aren't in the class but it not doing that instead it is showing me a blank drop down menu. the way i have it set up is that the admin clicks the add student button then it will convert a .html page to modal which brings up the list of students to select from. When i add the form responsible for saving the student to the class in the Django admin it work perfect but i cant seem to get it to work in the user section Ui. I am new to Django and this is my first project so any help is really appreciated
Views
#check to see if students already exist in class and display those who aint to be added
#login_required
def manage_class_student(request, classPK=None):
if classPK is None:
messages.warning(request,'Class ID is Unknown')
else:
context['classPK'] = classPK
_class = Room.objects.get(id=classPK)
# print(ClassStudent.objects.filter(classIns = _class))
students = Student.objects.exclude(id__in=ClassStudent.objects.filter(classIns=_class).values_list('student').distinct()).all()
context['students'] = students
return render(request, 'manage_class_student.html', context)
#save the students to the respective class after being selected
#login_required
def save_class_student(request):
form = SaveClassStudent()
if request.method == 'POST':
form = SaveClassStudent(request.POST)
if form.is_valid():
form.save()
messages.success(request, "Student has been added successfully.")
redirect('class_detail')
else:
messages.error(request, 'Error Adding student in class')
template with the form to show the available students
<!-- Modal -->
<div class="modal fade" {% block modal-id %} id="addModal{{class.pk}}" {% endblock%} data-bs-backdrop="static"
data-bs-keyboard="false" tabindex="-1" aria-labelledby="addModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h6 class="modal-title" id="addModalLabel"> {% block modal-title%}<i class="fas fa-plus"></i> Add
Student To Class{% endblock%}</h6>
<button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
</div>
<div class="container-fluid">
<form {% block action %} action="{% url 'save-class-student' %}" {% endblock%} method="post">
{% csrf_token %}
<div class="modal-body">
<input type="hidden" name="classIns" value="{{ classPK }}">
<div class="form-group mb-3">
<label for="student" class="control-label">Student</label>
<select name="student" id="student" class="form-select rounded-0 select2" required>
<option disabled selected></option>
{% for student in students %}
<option value="{{ student.id }}">{{ student }}</option>
{% endfor %}
</select>
</div>
<div>
<button type="submit" class="btn btn-primary">Save</button>
</div>
</form>
</div>
</div>
</div>
</div>
What triggers the modal
<div class="tools">
<button type="button" class="btn btn-secondary border rounded-0 bg-gradient btn-sm"
id='print_attendance_report'><i class="fa fa-print"></i> Print Attendance Report</button>
<a data-bs-toggle="modal" data-bs-target="#addModal{{class.pk}}"> <button type="button"
class="btn btn-primary rounded-0 bg-gradient btn-sm" id='add_new'><i class="fa fa-plus"></i>
Add Student</button></a>
</div>
form that save students to classroom
class SaveClassStudent(forms.ModelForm):
classIns = forms.IntegerField()
student = forms.IntegerField()
class Meta:
model = ClassStudent
fields = ('classIns', 'student')
def clean_classIns(self):
cid = self.cleaned_data['classIns']
try:
classIns = Room.objects.get(id=cid)
return classIns
except:
raise forms.ValidationError("Class ID is Invalid.")
def clean_student(self):
student_id = self.cleaned_data['student']
_class = Room.objects.get(id=self.data.get('classIns'))
student = Student.objects.get(id=student_id)
try:
cs = ClassStudent.objects.get(classIns=_class, student=student)
if len(cs) > 0:
raise forms.ValidationError(
f"Student already exists in the Class List.")
except:
return student