如何检查表单中两个字段的验证？

如何解决如何检查表单中两个字段的验证？

需要通过输入图像的链接向表单添加图像，或上传 文件。 如果提交表单时未输入任何选项，或同时输入了两个选项，则应显示错误消息。成功加载后，您应该进入图像页面。

models.py：

class Picture(models.Model):
    url = models.URLField(blank=True,verbose_name='Ссылка на изображение')
    image = models.ImageField(upload_to='pictures/%Y/%m/%d',width_field='image_width',height_field='image_height',blank=True,verbose_name='Изображение')
    image_width = models.IntegerField(default=0,verbose_name='Ширина изображения')
    image_height = models.IntegerField(default=0,verbose_name='Высота изображения')
    is_active = models.BooleanField(default=True,verbose_name='Актуальность изображения')
    created = models.DateField(blank=True,null=True,default=timezone.Now,verbose_name='Дата создания записи')
    updated = models.DateField(blank=True,verbose_name='Дата ред-ия записи')

views.py：

def add_picture(request):
    picture = Picture.objects.filter(is_active=True)
    if request.method == 'POST':
        form = PictureCreateForm(data=request.POST,files=request.FILES)
        if form.is_valid():
            form.save()
            return render(request,'add_picture.html',locals())
        else:
            messages.error(request,'Ошибка,проверьте данные')
    else:
        form = PictureCreateForm()

    return render(request,locals())

forms.py：这里需要定义一个方法clean

class PictureCreateForm(forms.ModelForm):
    class Meta:
        model = Picture
        fields = ('url','image')

def clean(self):

    cd = self.cleaned_data
    if cd['url'] and cd['image']:
        raise forms.ValidationError('Ошибка!')
    if not cd['url'] and not cd['image']:
        raise forms.ValidationError('Ошибка!')
    return cd

urls.py：

urlpatterns = [
    path('',views.home,name='home'),path('add_picture/',views.add_picture,name='add_picture'),path('picture_detail/<int:id>/',views.picture_detail,name='picture_detail'),]

解决方法

您可以将clean(...)的forms.ModelForm方法用作

class PictureCreateForm(forms.ModelForm):
    class Meta:
        model = Picture
        fields = ('url','image')

    def clean(self):
        cleaned_data = super().clean()
        url = cleaned_data.get("url")
        image = cleaned_data.get("url")

        # do your logic here
        # atlast
        return cleaned_data