使用modelform保存postgres arrayfield

Question

我有一个ArrayField的模型，我希望使用ModelForm保存数据。但我的问题是每次只有数组的第一个值是保存。如何从表单中保存整个数组？这是我的代码：

模型：

class Reminder(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    active = models.BooleanField(default=True)
    provider_type = (
        ('Em', 'Email'),
        ('Sm', 'SMS'),
        ('De', 'Desktop'),
        ('Mo', 'Mobile'),
    )
    notification = ArrayField(models.CharField(choices=provider_type, max_length=2, default='Em'))

形式：

class ReminderForm(ModelForm):
    class Meta:
        model = Reminder
        exclude = ('user', )

视图：

def create(request):
    if request.method == 'POST':
        reminder_form = ReminderForm(request.POST)
        if reminder_form.is_valid():
            form = reminder_form.save(commit=False)
            user = get_object_or_404(User, username=request.user.username)
            form.user = user
            form.save()
        else:
            .....
        return redirect('create')
    return render(request, 'add.html')