我正在使用ModelForm捕获模型的一些数据,虽然我希望将这些数据保存到db中,但我也想将其导出到XML文件中以在外部系统中进行转换/使用。
请参见下面的示例:
def warranty(request):
WarrantyFormSet = modelformset_factory(Warranty, form=WarrantyForm)
if request.method == 'POST':
formset = WarrantyFormSet(request.POST, request.FILES)
if formset.is_valid():
new = formset.save(commit=False)
out = open("file.xml", "w")
XMLSerializer = serializers.get_serializer("xml")
xml_serializer = XMLSerializer()
for n in new:
xml_serializer.serialize(Warranty.objects.all(), stream=out)
#.filter(id = n.id)
n.save()
return HttpResponse(xml_serializer.serialize(Warranty.objects.filter(id = n.id)))
else:
formset = WarrantyFormSet(queryset = Warranty.objects.none())
return render(request,'warranty.html', {'formset': formset})
该对象在HttpResponse中进行了适当的序列化(即,我可以看到可接受的XML输出),但是XML文件本身没有输出。如果我删除QuerySet过滤器(即调用.all()),则XML文件将正确包含与保修模型相关的所有对象。在一种情况下,该行为在另一种情况下没有问题,这似乎很奇怪,因此我再也无法进行任何射击了。
问题是,您正在尝试序列化对象,然后将它们实际保存到数据库中-因此传递给序列化程序的queryset将不包含此新项。更改顺序:
for n in new:
n.save()
xml_serializer.serialize(Warranty.objects.filter(id=n.id), stream=out)
还请注意,您当前的逻辑会在for循环中的文件中写入新的序列化-我不确定这是您想要的。您可以像这样一次序列化所有内容:
if request.method == 'POST':
formset = WarrantyFormSet(request.POST, request.FILES)
if formset.is_valid():
new_items = formset.save() # commit = True since you don't need to change anything before saving
new_item_ids = [n.id for n in new_items]
with open("file.xml", "w") as out:
XMLSerializer = serializers.get_serializer("xml")
xml_serializer = XMLSerializer()
xml_serializer.serialize(
Warranty.objects.filter(id__in=new_item_ids), stream=out)