Question

我需要从查询中过滤掉大量对象。目前，它正在抓取类中的所有对象，我想将其过滤到查询字符串中的相关对象。我怎样才能做到这一点？当我尝试时，我得到一个属性错误说明

''QuerySet' object has no attribute '__name__'.'

有效的代码，但非常缓慢：

formset = modelformset_factory(Transaction, form=PaidDateForm, extra=0, can_delete=False)

另外，formset：

formset = formset(request.POST, Transaction.objects.filter(pk__in=qs))

我想要过滤的QueryString称为＆＃39; qs。＆＃39;

class PaidDateForm(forms.ModelForm):
    formfield_callback = jquery_datefield
Amount",max_digits=14,decimal_places=2,required=False)
    date_cleared = forms.DateField(label="Cleared Date",widget=JQueryDateWidget(), input_formats=settings.DATE_INPUT_FORMATS, required=False)

    class Meta:
        model = Transaction
        include = ('date_time_created')

    def __init__(self, *args, **kwargs):
        self.queryset = Transaction.objects.filter(pk__in=qs)
        super(PaidDateForm, self).__init__(*args, **kwargs)
        for field in self.fields:
            if field != 'date_cleared':
                self.fields[field].widget = forms.HiddenInput()
        self.fields['paid_amount'].widget.attrs['size'] = 12
        self.initial['paid_amount'] = '%.2f' % (self.instance.usd_amount)

Answer 1

查看Django文档中的示例： https://docs.djangoproject.com/en/dev/topics/forms/modelforms/#changing-the-queryset

如果我正确理解了您的问题，则有两种方法可以解决您的问题：

首先：

TransactionFormset = modelformset_factory(Transaction,form=PaidDateForm, extra=0, can_delete=False)
formset = TransactionFormset(queryset=Transaction.objects.filter(pk__in=qs))

第二个选项是创建BaseTransactionFormset

class BaseTransactionFormSet(BaseModelFormSet):
    def __init__(self, *args, **kwargs):
        super(BaseTransactionFormSet, self).__init__(*args, **kwargs)

        #create filtering here whatever that suits you needs
        self.queryset = Transaction.objects.filter()

formset = modelformset_factory(Transaction, formset=BaseTransactionFormSet,form=PaidDateForm, extra=0, can_delete=False)

此代码对您有帮助吗？

Answer 2

我犹豫你仍然需要它，但这段代码对我有用

FormSet =  modelformset_factory(YourModel, fields=(...))
form_set = FormSet(queryset = YourModel.objects.filter(...))

Django modelformset_factory（）过滤

2 个答案: