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我在将 UpdateView 用于由表单和表单集组成的视图时遇到问题。

我有以下模型:项目和图片。

图片定义为:

class Picture(models.Model):

    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=255, blank=False)

    content_type = models.ForeignKey(ContentType, verbose_name="content type",
                related_name="content_type_set_for_%(class)s")
    object_id = models.PositiveIntegerField()
    content_object = generic.GenericForeignKey("content_type", "object_id")

我有几个包含图片的模型。例如,在 Item 模型中:

class Item(models.Model):

    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=255, blank=False)
    pictures = generic.GenericRelation(Picture)

我有以下 ItemCreateForm:

class ItemCreateForm(ModelForm):

    def __init__(self, *args, **kwargs):
        super(ItemCreateForm, self).__init__(*args, **kwargs)

    class Meta:
        model = Item

图片形式:

class PictureForm(forms.ModelForm):

    id  = forms.IntegerField(widget=forms.HiddenInput)

    def __init__(self, *args, **kwargs):
        super(PictureForm, self).__init__(*args, **kwargs)

    def save(self):
         data = self.cleaned_data
         obj = Picture(**data);
         # do something to obj
         # obj.save() 

    class Meta:
        model = Picture
        fields = ['id', 'name']

和观点:

class ItemUpdateView(UpdateView):
    form_class = ItemCreateForm
    template_name = 'item/new.html'
    model = Item
    success_url = '/items/'

    def get_context_data(self, **kwargs):
        context = super(ItemUpdateView, self).get_context_data(**kwargs)
        item = context['object']

        # Dont' create any extra forms when showing an update view
        PictureFormSet = formset_factory(PictureForm, extra=0)

        return {'form': kwargs['form'],
                'picture_formset': UploadFormSet(initial = [ model_to_dict(a) for pic in item.pictures.all()])}

    def post(self, request, *args, **kwargs):

       self.object = self.get_object()

       item_form = ItemCreateForm(request.POST, instance=self.object)

       if item_form.is_valid():
           item = item_form.save(commit=False)
           item.save()

           # How do update the pictures?

这是我的 urls.py:

url(r'^items/(?P<pk>\d+)/update/$', ItemUpdateView.as_view(), name='item_update')

模板:

<form action="" method="post" enctype="multipart/form-data">

{% for field in form %}
    # do something
{% endfor %}


{{ picture_formset.management_form }}
{% for form in picture_formset.forms %}
    # do something
{% endfor %}

<input  name="commit" type="submit" value="Submit" />
</form>

我是 Django 的新手。

用户可以通过用于显示项目和多张图片的单个模板中的图片表单动态(通过 jQuery)添加/删除图片。

1 我必须将 id 作为图片的隐藏字段包含在内,否则将插入图片而不是更新。QN:有没有更好的方法来做到这一点?

2 如何更新图片模型?目前request.POST没有模型中的所有字段,因此模型抱怨 NULL 字段?我完全迷失了如何在 UpdateView 中处理 formset 并且不是主要形式,就像在 url 中带有 pk 的 UpdateView 的简单示例。

PictureFormSet = formset_factory(PictureForm)
picture_formset = PictureFormSet(request.POST, request.FILES)

for picture_form in picture_formset.forms:
      picture_form.save()
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