python - Django UpdateView，获取当前正在编辑的对象id？

Question

我正在尝试获取正在编辑的当前记录的 ID，但目前为止失败了。我的观点如下:

View .py

class EditSite(UpdateView):
    model = SiteData
    form_class = SiteForm
    template_name = "sites/site_form.html"

    @method_decorator(user_passes_test(lambda u: u.has_perm('config.edit_subnet')))
    def dispatch(self, *args, **kwargs):
        self.site_id = self.object.pk
        return super(EditSite, self).dispatch(*args, **kwargs)

    def get_success_url(self, **kwargs):         
            return reverse_lazy("sites:site_overview", args=(self.site_id,))

    def get_form_kwargs(self, *args, **kwargs):
        kwargs = super().get_form_kwargs()
        return kwargs

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['SiteID']=self.site_id
        context['SiteName']=self.location
        context['FormType']='Edit'

        return context

和错误:

File "/itapp/itapp/sites/views.py" in dispatch
  890.         self.site_id = self.object.pk

Exception Type: AttributeError at /sites/site/edit/7
Exception Value: 'EditSite' object has no attribute 'object'

我试过:

self.object.pk
object.pk
self.pk

Answer 1

View 的对象属性在 BaseUpdateView 获取/发布期间设置:

def get(self, request, *args, **kwargs):
    self.object = self.get_object()
    return super(BaseUpdateView, self).get(request, *args, **kwargs)

def post(self, request, *args, **kwargs):
    self.object = self.get_object()
    return super(BaseUpdateView, self).post(request, *args, **kwargs)

所以在dispatch方法中还不可用。但是它将在 get_success_url 和 get_context_data 方法中可用，因为它们发生在 get/post 之后。所以你可以这样做:

from django.contrib.auth.mixins import PermissionRequiredMixin

class EditSite(PermissionRequiredMixin, UpdateView):
    model = SiteData
    form_class = SiteForm
    template_name = "sites/site_form.html"
    permission_required = 'config.edit_subnet'

    def get_success_url(self, **kwargs):         
        return reverse_lazy("sites:site_overview", args=(self.object.site_id,))

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['SiteID']=self.object.site_id
        context['SiteName']=self.location # <--- where does self.location come from? self.object.location perhaps?
        context['FormType']='Edit'
        return context