Python Django内联表单集通过另一个模型过滤多个关系

我有两个模型：班级模型和学生模型，它们通过一个入学模型建立了多对多的关系

class Student(models.Model):
    name = models.CharField(max_length=100)
    code = models.CharField(max_length=10)

class SchoolClass(models.Model):
    code = models.CharField(max_length=100)
    cycle = models.ForeignKey(Cycle)
    students = models.ManyToManyField(Student,through='Enrolment')

class Enrolment(models.Model):
    student = models.ForeignKey(Student)
    school_class = models.ForeignKey(SchoolClass)

SchoolClass模型有一个字段周期（即班级运行的年份+学期）。当我在管理员中查看学生时，我希望看到学生只在给定周期（例如当前周期）内注册的班级

我以前在注册模型中有cycle字段，下面的操作很好：

class StudentEnrolmentsInlineFormSet(BaseInlineFormSet):
    def get_queryset(self):
        if not hasattr(self, '_queryset'):
            qs = super(StudentInlineFormSet, self).get_queryset().filter(cycle=Current)
            self._queryset = qs
        return self._queryset

class StudentEnrolmentsInline(admin.TabularInline):
    model = Enrolment
    formset = StudentEnrolmentsInlineFormSet

class StudentAdmin(admin.ModelAdmin):
    form = StudentForm
    inlines = (StudentEnrolmentsInline,)

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但是，我已经将循环移到了SchoolClass模型中，现在无法确定如何将过滤器应用到下一个模型中。

除非我忽略了某些内容，否则您可以使用StudentenrolmentsLine上的

queryset

方法执行此操作：

def queryset(self, request):
    current = Cycle.objects.latest() # or whatever to get the current cycle
    qs = super(StudentEnrolmentsInline, self).queryset(request)
    return qs.filter(school_class__cycle=current)