django表單創建或編輯排除對象

Question

我想知道如何從查詢集中排除可編輯對象，並且如果我使用相同的表單創建對象，它仍然有效。

我的形式：

class CountryForm(forms.ModelForm): 
    """Form to create or edit Countries.""" 

    name = forms.CharField() 
    flavor = forms.CharField(
    widget=forms.Textarea(attrs={'width': 300, 'height': 100})) 
    history = forms.CharField(
     widget=forms.Textarea(attrs={'width': 300, 'height': 100})) 
    likes_set = Country.objects.all().exclude(self) 
    likes = forms.ModelChoiceField(queryset=likes_set, empty_label="Country it likes" 

    class Meta: 
     model = Country 

Answer 1

你需要做的這__init__()方法，如果可用也通過instance變量在實例的形式。

class CountryForm(forms.ModelForm): 
    """Form to create or edit Countries.""" 

    name = forms.CharField() 
    flavor = forms.CharField(
    widget=forms.Textarea(attrs={'width': 300, 'height': 100})) 
    history = forms.CharField(
     widget=forms.Textarea(attrs={'width': 300, 'height': 100})) 
    likes = forms.ModelChoiceField(queryset=Country.objects.all(), empty_label="Country it likes" 

    class Meta: 
     model = Country 

    def __init__(self, *args, **kwargs): 
     super(CountryForm, self).__init__(*args, **kwargs) 
     if 'instance' in kwargs: 
      self.fields['likes'].queryset = Country.objects.exclude(kwargs['instance']) 

鑑於你必須創建形式

myform = CountryForm(instance=country_obj) 

或

myform = CountryForm(request.POST, instance=country_obj)