筛选外键下拉字段Django

我有三张桌子，学生，K8分，老师和班级。学生表跟踪所有学生数据信息，您可以将其分配到教室，分数跟踪他们当天获得的分数，教室表是创建教室名称的地方。我想完成的是当您登录到/k8\u points\u教室/1时？页面中，有一个学生下拉字段。教室末尾的1是教室id。字段student_name应仅显示该特定班级的学生，如何筛选该字段？现在，它只是调出数据库中的每个学生。谢谢你的帮助

模型

形式

看法

---

您需要将类作为参数传递给视图中的表单，然后调整student_name字段的queryset以向下过滤到该类的学生

class K8PointsClassroomForm(forms.ModelForm):
    def __init__(self, *args, class_=None, **kwargs):
          super (K8Points_ClassroomForm,self).__init__(*args,**kwargs )
          self.fields['date'].disabled = True
          self.fields['day'].disabled = True
          self.fields['week_of'].disabled = True
          # Limit the fields queryset to that of the class's students.
          self.fields['student_name'].queryset = class_.student_set.all()

编辑：

以下是我试图解释的观点：

@login_required
def K8_Points_Classroom(request, classid):
    class_name = TeacherClass.objects.get(id=classid)
    form = K8Points_ClassroomForm(class_=class_name)

---

我很困惑，那么我是在视图中创建查询集并将其发布到forms.py吗？我刚刚发布了我的视图，以便您可以看到它。不，您将类实例传递到表单的构造函数中。我迷路了，您能不能帮我写出来让我看到它。

form=K8Points\u ClassroomForm（class\u=class\u instance）

这是可行的，但如果我硬编码了id，但无法获取id。

@login_required
def K8_Points_Classroom(request, classid):

    if request.method == "GET":

        date = datetime.date.today()
        students = Student.objects.filter(class_name=classid).order_by('student_name')
        class_name = TeacherClass.objects.get(id=classid)
        form = K8Points_ClassroomForm(classid = class_name.id)
        request.session['my_class_id'] = classid
        return render(request, 'points/k8_points_classroom.html', {'form': form, 'students': students, 'class_name': class_name, 'date': date , 'classid': classid})

class K8PointsClassroomForm(forms.ModelForm):
    def __init__(self, *args, class_=None, **kwargs):
          super (K8Points_ClassroomForm,self).__init__(*args,**kwargs )
          self.fields['date'].disabled = True
          self.fields['day'].disabled = True
          self.fields['week_of'].disabled = True
          # Limit the fields queryset to that of the class's students.
          self.fields['student_name'].queryset = class_.student_set.all()

@login_required
def K8_Points_Classroom(request, classid):
    class_name = TeacherClass.objects.get(id=classid)
    form = K8Points_ClassroomForm(class_=class_name)