从视图导入数据后如何将下拉数据分配给字段

Question

我正在 forms.py 中创建一个下拉列表并过滤数据，我得到一个名为 layer_id 的变量。并像这样进入视野 layer_id = kwargs['layer_id'] 。一切都很好，但是当我最终分配给这样的文件时 self.fields['apn'].queryset= Field.objects.filter(layer=layer) 。调用转到数据库的 fields table，而不是分配我在 forms.py 中声明的这些字段。那么我可以将谁分配给 forms.py

中的字段

class labelModelForm(forms.ModelForm):
    model = Labels_tool_
    fields = ['apn', 'owner_name', 'situs_addr_One', 'situs_addr_Two', 'mailing_addr_One', 'mailing_addr_Two']
    apn = forms.ModelChoiceField(queryset=Field.objects.values_list('name', flat=True), empty_label="(Choose field)")

    def __init__(self, *args, **kwargs):
  //getting layer_id from views
        layer_id = kwargs['layer_id']
        print         layer_id
        layer=Layer.objects.filter(id=layer_id).first()
        x=Field.objects.filter(layer=layer)
         //On this step when modify queryset I get error
        self.fields['apn'].queryset= Field.objects.filter(layer=layer)

Answer 1

def __init__(self, *args, **kwargs):
    layer_id = kwargs.pop('layer_id', None)
    super(labelModelForm, self).__init__(*args, **kwargs)
    layer=Layer.objects.filter(id=layer_id).first()
    x=Field.objects.filter(layer=layer)
    self.fields['apn'].queryset= Field.objects.filter(layer=layer)

希望对您有所帮助

将您的表单更改为

class labelModelForm(forms.ModelForm):
      apn = forms.ModelChoiceField(Field.objects.values_list('name', flat=True), empty_label="(Choose field)")
    class Meta:
        model = Labels_tool_
        fields = ['apn', 'owner_name', 'situs_addr_One', 'situs_addr_Two', 'mailing_addr_One', 'mailing_addr_Two']

Answer 2

如果你想将一些变量形成实例，你可以使用get_form_kwargs方法。你可以在 __init__.

中使用它

#views.py

class ExampleRegisterView(CreateView):
    model = ExampleModel
    form_class = RegisterExampleForm
    template_name = 'example.html'

    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        kwargs['layer_id'] = 12 # for example, I give 12.
        return kwargs

#forms.py

class RegisterExampleForm(forms.ModelForm):
    apn = forms.ChoiceField(label="test")
    class Meta:
        model = ExampleModel
        fields = ['yourfield', ]
    def __init__(self, *args, **kwargs):
        layer_id = kwargs.pop('layer_id', None)
        super().__init__(*args, **kwargs)
        if layer_id:
            layer = Layer.objects.get(id=layer_id).first()
        self.fields['apn'].choices = Field.objects.filter(layer=layer)

从视图导入数据后如何将下拉数据分配给字段

How to assign dropdown data to a field after importing data from view

python

django

django-forms

multi-model-forms