Django CreateView过滤选择字段中的外键

我需要一些有关 Django 2 和 Python 3 的帮助。

我正在使用一个CreateView在我的数据库中添加新记录，但我需要为我的记录创建一个过滤器Aviso表单页面使选择字段（fieldturma）仅显示其中的实例representante是当前用户。

这是我的模型：

class Turma(models.Model):
    nome                    = models.CharField(max_length=120, blank=False, null=False, help_text='Obrigatório.')
    alunos                  = models.ManyToManyField(User, help_text='Obrigatório', related_name='alunos_matriculados')
    data_cadastro           = models.DateField(auto_now_add=True)
    representante           = models.ForeignKey(User, on_delete=models.PROTECT, blank=False, null=False)
    colegio                 = models.ForeignKey(Colegio, on_delete=models.PROTECT, blank=False, null=False, help_text='Obrigatório.')

class Aviso(models.Model):
    data_final              = models.DateField(auto_now=False, auto_now_add=False, blank=False, null=False, verbose_name="Data Final")
    comentarios             = models.TextField(null=True, blank=True)
    ultima_modificacao      = models.DateField(auto_now=True)
    data_post               = models.DateField(auto_now_add=True)
    turma                   = models.ForeignKey(Turma, on_delete=models.PROTECT, null=False, blank=False)
    materia                 = models.ForeignKey(Materia, on_delete=models.PROTECT, null=False, blank=False)

这是我的观点：

class AvisoCreateView(LoginRequiredMixin, CreateView):  #Cadastro de Aviso
    template_name = 'form.html'
    model = models.Aviso
    login_url = '/login/'
    success_url = reverse_lazy('visualizar_aviso')
    fields = [
        'turma',
        'materia',
        'tipo_aviso',
        'comentarios',
        'data_final'
    ]
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        context['titulo'] = 'Cadastrar aviso'
        context['input'] = 'Adicionar'
        return context

怎么可能呢？

您可以将查询集添加到ForeignKey 字段。

def get_context_data(self, **kwargs):
    context = super().get_context_data(**kwargs)
    context['form'].fields['turma'].queryset = Turma.objects.filter(representante=self.request.user)    
    context['titulo'] = 'Cadastrar aviso'
    context['input'] = 'Adicionar'
    return context