__init__形式Django的Queryset

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__()缺少1个必需的位置参数：'queryset'。如何Queryset在__init__Form中使用？

Answer 1

除非您当前隐藏了一些信息，否则最好在的声明中声明querysetModelChoiceField：

class PaymentSelectForm(forms.Form):

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

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

如果queryset是动态的（此处不是这种情况），可以将其设置为Noneinitial，然后在__init__函数中覆盖它：

class PaymentSelectForm(forms.Form):

    date_from = forms.DateField()
    date_to = forms.DateField()
    website = ModelChoiceField(queryset=None) 
    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()

但这通常是这种情况，例如，queryset依赖于传递给表单的参数，或者依赖于其他表（并且不能优雅地写入SQL查询中）。