是否可以排除用戶已經選擇并存儲在表中的選項？這是來自models.py的表格class Fruit(models.Model):name = models.CharField(max_length=250, unique=True, blank=False, null=False)sort= models.ForeignKey('FruitSort', on_delete=models.SET_NULL, null=True, blank=False)def __str__(self): return '%s (%s)' % (self.name, self.sort.name)class UserFruit(models.Model): Comment = models.CharField(max_length=55) user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE) fruit = models.ForeignKey('Fruit', on_delete=models.CASCADE) class Meta: unique_together = (("user", "fruit",),)這是生成我的表單的 forms.py。class UserFruit(forms.ModelForm):class Meta: model = UserFruit fields = ('comment', 'fruit')def __init__(self, *args, **kwargs): super(UserFruit, self).__init__(*args, **kwargs) for visible in self.visible_fields(): visible.field.widget.attrs['class'] = 'form-control form-style-alt' self.fields['comment'].widget.attrs['placeholder'] = 'comment' self.fields['fruit'].empty_label = 'Please, choose fruit'現在views.pyclass Fruit(generic.CreateView): form_class = UserFruit template_name = 'fruit.html' def get(self, request, *args, **kwargs): form = self.form_class(instance=UserFruit.objects.filter(user=request.user).first()) fruit = UserFruit.objects.filter(user=request.user) return render(request, self.template_name, {'form': form, 'fruit': fruit}) def post(self, request, *args, **kwargs): form = self.form_class(request.POST) if form.is_valid(): post = form.save(commit=False) post.user = request.user post.save() return redirect('fruit')最后是模板。我想排除或禁用用戶已經添加的水果。我似乎沒有找到一個干燥和順利的解決方案。我可以從數據庫中循環并通過 javascript 排除。但是看起來很俗氣。非常感謝您的想法！
1 回答
FFIVE
TA貢獻1797條經驗 獲得超6個贊
是的。例如，您可以將user參數傳遞給表單，并作為Fruit尚未選擇的查詢集選擇，例如：
class UserFruitForm(forms.ModelForm):
class Meta:
model = UserFruit
fields = ('comment', 'fruit')
def __init__(self, user, *args, **kwargs):
super(UserFruit, self).__init__(*args, **kwargs)
for visible in self.visible_fields():
visible.field.widget.attrs['class'] = 'form-control form-style-alt'
self.fields['comment'].widget.attrs['placeholder'] = 'comment'
self.fields['fruit'].empty_label = 'Please, choose fruit'
self.fields['fruit'].queryset = Fruit.objects.exclude(
userfruit__user=user
)
但是，您在CreateView. 您可以簡單地讓 theCreateView完成幾乎所有的工作：
from django.urls import reverse_lazy
class Fruit(generic.CreateView):
form_class = UserFruitForm
template_name = 'fruit.html'
success_url = reverse_lazy('fuit')
def get_form_kwargs(self):
kwargs = super().get_form_kwargs()
kwargs.update(user=self.request.user)
return kwargs
def get_context_data(self, *args, **kwargs):
context = super().get_context_data(*args, **kwargs)
context.update(fruit=UserFruit.objects.filter(user=self.request.user))
return context
def form_valid(self, form):
form.instance.user = self.request.user
super().form_valid(form)
請將表格重命名為UserFruitForm. 現在，您在模型和表單之間引入了名稱沖突。通過重命名它，您所指的內容就很清楚了。UserFruitUserFruit
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