我有以下基于类的视图,我想用它来呈现一个formset,并在通过post方法提交时验证它:
formset呈现完美。当我提交表单时,我可以阅读formset并检查它是否有错误。在这个类的post方法中 - > errors = backorder_formset.errors
如果我在formset中发现任何错误,我想渲染视图,但这次是使用formset实例,我从POST读取。
当我在类的post方法中调用ctx = self.get_context_data()
表单时,会从调用super(MissingProductsListView, self).get_context_data(*args, **kwargs)
中引发以下错误:
的 'MissingProductsListView' object has no attribute 'object_list'
似乎Listview的超类执行此调用:queryset = kwargs.pop('object_list', self.object_list)
我的问题是为什么我在运行此错误?我如何使用其错误消息呈现此formset以在发布后在模板中显示它?我正在使用Django 1.9.9
class MissingProductsListView(generic.ListView):
template_name = 'dashboard/purchaseorder/missing_products.html'
context_object_name = 'backorders'
model = BackOrder
def post(self, request, *args, **kwargs):
backorder_formset = BackOrderFormset(request.POST)
errors = backorder_formset.errors
if backorder_formset.is_valid():
# <process form cleaned data>
return HttpResponseRedirect('/success/')
else:
ctx = self.get_context_data()
return self.render_to_response(ctx)
def accumulate_identical_products_from_backorders(self, back_order_list):
... some code
return sorted_accumulated_dict.values()
def get_context_data(self, *args, **kwargs):
ctx = super(MissingProductsListView, self).get_context_data(*args, **kwargs)
ctx['title'] = _("Missing Products")
if self.request.POST:
ctx['back_order_formset'] = BackOrderFormset(self.request.POST)
else:
accumulated_backorders_per_product = self.accumulate_identical_products_from_backorders(BackOrder.objects.all())
back_orders = BackOrderFormset(initial=[{'product_id': backorder_dict['product_id'],
'product': backorder_dict['title'],
'quantity': backorder_dict['quantity']} for backorder_dict in
accumulated_backorders_per_product])
ctx['back_order_formset'] = back_orders
return ctx
def get_queryset(self):
.. some code
return backorder_list
答案 0 :(得分:1)
看这里:
class BaseListView(MultipleObjectMixin, View):
"""
A base view for displaying a list of objects.
"""
def get(self, request, *args, **kwargs):
self.object_list = self.get_queryset()
allow_empty = self.get_allow_empty()
if not allow_empty:
# When pagination is enabled and object_list is a queryset,
# it's better to do a cheap query than to load the unpaginated
# queryset in memory.
if self.get_paginate_by(self.object_list) is not None and hasattr(self.object_list, 'exists'):
is_empty = not self.object_list.exists()
else:
is_empty = len(self.object_list) == 0
if is_empty:
raise Http404(_("Empty list and '%(class_name)s.allow_empty' is False.") % {
'class_name': self.__class__.__name__,
})
context = self.get_context_data()
return self.render_to_response(context)
基本上 - 你错过了POST处理程序中的这一部分:
self.object_list = self.get_queryset()
说实话 - 我不太确定在django中将帖子添加到通用ListView是否是一个好主意。它看起来更像是FormView - 但我在这里错了。