Question

我遇到以下错误：

XMLDocument

我有很多型号，可以有很多图像。因此，我使用了django的GenericRelation。但是，一旦我在let xmlString = """ <data> <button/> <tag> <button/> </tag> </data> """ let document = try XMLDocument(xmlString: xmlString, options: [.documentTidyXML]) for node in try document.nodes(forXPath: "//button") { guard let buttonElement = node as? XMLElement else { continue } buttonElement.setAttributesWith([ "customClass": "AmazingButton", "customModule": "IBComponents", "customModuleProvider": "target", ]) } let newXMLString = document.xmlString(options: [.nodePrettyPrint]) print(newXMLString)中添加了“ 图片”字段。我收到错误消息

forms.py

django.core.exceptions.FieldError: 'pictures' cannot be specified for Building model form as it is a non-editable field

models.py

forms.py

views.py

class BuildingForm(ModelForm):
    class Meta:
        model = Building
        fields = ['landlord', 'address', 'pictures']

forms.html

from stdimage.models import StdImageField

class Image(TimeStampedModel, models.Model):
    picture = StdImageField(upload_to='pictures/%Y/%m/%d',
                            verbose_name="pics", null = True, blank = True, variations={
        'large': (600, 400),
        'thumbnail': (250, 250, True),
        'medium': (300, 200),
    }, default='default.jpg')
    # Generic Foreign Key
    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
    object_id = models.PositiveIntegerField()
    content_object = GenericForeignKey()


class Building(TimeStampedModel, models.Model):
    landlord = models.ForeignKey(
                settings.AUTH_USER_MODEL,
                related_name='building_manager')
    address = models.CharField(max_length=50, blank=False)
    pictures = GenericRelation(Image, null = True, blank = True,
        related_query_name='dwelling_picture', verbose_name=_('Screenshots'))

跟踪

class BuildingCreateView(SuccessMessageMixin, CreateView):
    form_class = BuildingForm
    template_name = "parking/building/building_form.html"
    success_message = 'Successfully Added a Post entry'
    success_url = reverse_lazy('parkers:building_list')

    def form_valid(self, form):
        self.object = form.save(commit=True)
        #self.object.author = self.request.user
        return super(BuildingCreateView, self).form_valid(form)

parking_building_new = login_required(BuildingCreateView.as_view())

Answer 1

GenericForeignKeys不能与ModelForms一起使用。它们不是故意编辑的。您也不能对它们使用filter（）或exclude（）。您可以参考文档以获取更多信息：

https://docs.djangoproject.com/en/2.1/ref/contrib/contenttypes/#generic-relations

如何在Django中的表单中添加GenericRelation字段

1 个答案: