在DetailView中传递额外的数据

Question

我有FBV，我正在计算时间增量(td)并在我的上下文中传递它:

def update_moc(request, pk):
moc = get_object_or_404(Moc, pk=pk)
today = datetime.date.today()
time = moc.initiation_date
time_delta = today - time
td=str(time_delta)
initiator = moc.initiator
status = moc.moc_status
coordinator = moc.coordinators.filter(coordinator_name=request.user)

if request.user.is_superuser or (initiator == request.user or coordinator) and status == 'draft':

form = MocUpdateForm(request.POST or None, instance=moc)

today = datetime.date.today()
time = moc.initiation_date
time_delta = today - time
td=str(time_delta)

if form.is_valid():
moc.initiator = request.user
form.save()

return HttpResponseRedirect(reverse('moc_content_detail', kwargs={'pk': pk}))
else:
return render(request, 'moc/moc_content.html', context={'moc':moc, 'form':form, 'td': td}) 

else:

raise Http404()

然而，对于DetailView，我有CBV，并希望传递相同的time_delta (td)作为额外的上下文，但失败我如何做到这一点…我尝试了几种方法来通过

class MocDetailView(LoginRequiredMixin, DetailView):
model = Moc
template_name = 'moc/moc_detail.html'
def get_context_data(self, *args, **kwargs):
context = super(MocDetailView, self).get_context_data(*args, **kwargs)
context['td'] = # This is where I need help

def get_object(self, queryset=None):
obj = super(MocDetailView, self).get_object(queryset=queryset)
confidential = obj.confidential
initiator = obj.initiator
.....
if self.request.user.is_superuser or initiator == self.request.user or verifier or coordinator or reviewer or approver or preimplement or authorizer or postimplement or closer and confidential == True:
return obj
elif not confidential:
return obj      
else:
raise Http404()

有什么提示吗?

Answer 1

您可以使用self.object来计算timedelta:

def get_context_data(self, *args, **kwargs):
context = super(MocDetailView, self).get_context_data(*args, **kwargs)
time = self.object.initiation_date
today = datetime.date.today()
time_delta = today - time
td=str(time_delta)
context['td'] = td
return context

这应该可以工作，因为Django将get_object()方法的结果赋值给self.object变量。你可以在这里查看源代码。

Django也直接将对象传递到get_context_data，所以也可以从kwargs获得它:

def get_context_data(self, *args, **kwargs):
context = super(MocDetailView, self).get_context_data(*args, **kwargs)
time = kwargs['object'].initiation_date
# rest of the code