将表单数据传递给视图

Question

我有以下视图：

views.py

def PackingListView(request):
if request.method == "POST":
form = PackingListForm(request.POST)
if form.is_valid():
if 'preview' in request.POST:
request.session['data'] = form.cleaned_data
return redirect('myview')
....

我想获取form中的数据，并将其传递给下一个视图，并将data变量设置为等于它。这以前是有效的，但一旦我将外键添加到该表单中，会话就不再有效，因为它不可序列化。对我来说，在这里采取什么方法最安全？

views.py

class myview(View):
def get(self, request, *args, **kwargs):
data = request.session.pop('data', {})#this won't work  now
pdf = render_to_pdf('packlist_preview.html', data)
return HttpResponse(pdf, content_type='application/pdf')

此外，如果需要，这里是myview的URL

url(r'^myview/', views.myview.as_view(), name='myview'),

Answer 1

如果将模型实例替换为其id，则应该能够序列化数据。

data = form.cleaned_data
# remove object from data dict
related_object = data.pop('related_object')
# add in a reference
data['related_object_id'] = related_object.pk
# now you should be able to serialize object
request.session['data'] = data

然后在下一个视图中，您可以使用对象的id 从数据库中获取对象

data = request.session.pop('data', {})
related_object_id = data.pop('related_object_id', None)
if related_object_id:
try:
data['related_object'] = RelatedObject.objects.get(pk=related_object_id)
except RelatedObject.DoesNotExist:
pass