选择一个有效的选项Django Filtered下拉菜单

Question

开发人员

在我的项目中，我有一个表单，其中有一个字段，该字段有一个学生姓名选择，它是一个下拉字段，由当前在该特定班级注册的学生填写。它从表节“注册”中获取此信息，然后检查master Student表。过滤是正确的，但是当我提交我的表格时，它说学生的名字不是一个有效的选择。我猜是因为它提交的是学生姓名而不是身份证，我不是100%确定。这是我的模型和视图。我不知道怎么解决这个问题。谢谢你的帮助

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

问题似乎在这里：

 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')

该values_list('studentpsid_id__student_name', flat = True)收集的是学生name，而不是他们的id。因此，我认为表单字段将由错误的数据组成。 如果我是对的，解决方案可能是：

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')

或：

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