python - __init__ 形式 Django 中的查询集

Question

class PaymentSelectForm(forms.Form):   
    date_from = forms.DateField()
    date_to = forms.DateField()
    website = ModelChoiceField() 
    paymentmethod = forms.ChoiceField(choices=PAYCODE_CHOICES)

    def __init__(self, *args, **kwargs):
        super(PaymentSelectForm, self).__init__(*args, **kwargs)
        applyClassConfig2FormControl(self) 
        self.fields['website'].queryset=Website.objects.all()

我有错误:TypeError: __init__() missing 1 required positional argument: 'queryset'。如何在 __init__ 表单中使用 Queryset？

Answer 1

除非您当前隐藏了某些信息，否则您最好在 ModelChoiceField 的声明中声明查询集:

class PaymentSelectForm(forms.Form):

    date_from = forms.DateField()
    date_to = forms.DateField()
    website = ModelChoiceField(<b>queryset=Website.objects.all()</b>) 
    paymentmethod = forms.ChoiceField(choices=PAYCODE_CHOICES)

    def __init__(self, *args, **kwargs):
        super(PaymentSelectForm, self).__init__(*args, **kwargs)
        applyClassConfig2FormControl(self)

如果查询集是动态的(这里不是这种情况)，您可以最初将其设置为None，然后覆盖它在 __init__ 函数中:

class PaymentSelectForm(forms.Form):

    date_from = forms.DateField()
    date_to = forms.DateField()
    website = ModelChoiceField(queryset=<b>None</b>) 
    paymentmethod = forms.ChoiceField(choices=PAYCODE_CHOICES)

    def __init__(self, *args, **kwargs):
        super(PaymentSelectForm, self).__init__(*args, **kwargs)
        applyClassConfig2FormControl(self)
        <b>self.fields['website'].queryset=Website.objects.all()</b>

但这通常是这种情况，例如 queryset 取决于传递给表单的参数，或者它取决于其他表(并且不能优雅地写入 SQL 查询) .