Select 有效选择 Django 过滤下拉菜单

Question

Devs,

In my project I have a form that has a field that has a student name selection, it is a drop down field by the students that are currently enrolled in that particular class. It gets this information from table Section Enrollment than checks the master Student table. The filtering works out correctly, however when I submit my form, it says the student name is not a valid choice. My guess is because its submitting that student name and not a ID, I'm not 100% sure. Here is my models and view. I don't know how to fix this. Appreciate that help.

QUERY IN QUESTION:
getstudents = SectionEnrollment.objects.filter(section_id=classid).select_related().values_list('studentpsid_id__student_name', flat = True)

MODELS:

# Creation of Classrooms and Assigned Teachers 
class SectionEnrollment(models.Model):
    sectionenrollmentpsid = models.CharField(primary_key = True,max_length = 50, default = "")
    section = models.ForeignKey(Section,on_delete = models.PROTECT, default = "" ,)
    studentpsid = models.ForeignKey(Student,on_delete = models.PROTECT, default = "" ,)
    entry_date = models.DateField(blank=True)
    exit_date = models.DateField(blank=True)
    dropped = models.BooleanField(default = False, blank = True)
    

    class Meta:
       verbose_name = "Student Section Enrollment"
    def __str__(self):
        return self.sectionenrollmentpsid     

# Where Basic Student Data Is Stored 
class Student(models.Model):
    studentpsid= models.CharField(primary_key = True , default = "", max_length = 50, unique = True)
    student_name = models.CharField(max_length = 50)
    first_name = models.CharField(max_length = 50, default = "")
    last_name = models.CharField(max_length = 50,default = "")
    gender = models.CharField(max_length = 1,default = "")
    student_grade = models.CharField(max_length = 2, default = "")
    home_room = models.CharField(max_length = 5, default = "")
    student_enrollment = models.CharField(max_length = 2, default = "")
    school_number = models.CharField(max_length = 15, default = "") 
    email = models.EmailField(default = "")
    projected_graduation_year = models.CharField(max_length = 4, default = "")
    counseling_goal = models.TextField(max_length = 255)
    win_username = models.CharField(max_length = 50)
    win_password = models.CharField(max_length = 50)
    offsite_laptop = models.BooleanField(default = False, blank = True)
    image = models.ImageField(default ="default.png", upload_to ='student_pics')

VIEW:

@login_required
def Rapid_Fire(request, classid):

 if request.method == "GET":
     date = datetime.date.today()
     class_name = Section.objects.filter(sectionpsid=classid)
     getstudents = SectionEnrollment.objects.filter(section_id=classid).select_related().values_list('studentpsid_id__student_name', flat = True)
     student_selection = getstudents.all().order_by('studentpsid__student_name')
     my_class_id = request.session['my_class_id']
     sectionpsid = Section.objects.get(sectionpsid = my_class_id)
     form = Rapid_Fire_Form()
     form.fields["student_name"].queryset = getstudents
     form.fields["sectionpsid"].queryset = class_name
     context = ({'form': form, 'my_class_id': my_class_id, 'sectionpsid':sectionpsid,})
     return render(request, 'points/rapid_fire.html', context )

 elif request.method == "POST":
     date = datetime.date.today()
     class_name = Section.objects.filter(sectionpsid=classid)
     getstudents = SectionEnrollment.objects.filter(section_id=classid).select_related().values_list('studentpsid_id__student_name', flat = True)
     student_selection = getstudents.all().order_by('studentpsid__student_name')
     my_class_id = request.session['my_class_id']
     sectionpsid = Section.objects.get(sectionpsid = my_class_id)
     form = Rapid_Fire_Form(request.POST)
     form.fields["student_name"].queryset = getstudents
     form.fields["sectionpsid"].queryset = class_name
     if form.is_valid():
      # Records logged in user to table  
      obj = form.save(commit= False)
      userid = request.user
      obj.created_by = userid
      obj.save() 

Answer 1

it seems the problem is here:

 getstudents = SectionEnrollment.objects.filter(section_id=classid).select_related().values_list('studentpsid_id__student_name', flat = True)
 student_selection = getstudents.all().order_by('studentpsid__student_name')

the values_list('studentpsid_id__student_name', flat = True) is collecting the students name not their id . so the form field will be field by incorrect data I think. and if I'm right the solution may be:

students_id = SectionEnrollment.objects.filter(section_id=classid).select_related().values_list('studentpsid__id', flat = True)
student_selection = Student.objects.filter(id__in=students_id).order_by('student_name')

or:

student_selection = Student.objects.filter(sectionenrollment_set__section_id=classid).order_by('student_name')