我不明白为什么，但一个实例总是被创建复制我正在尝试编辑。此外，正如我所看到的FormSet我没有一个“实例”参数被添加到它的构造函数。无论如何，问题在于我在编辑对象时会生成Offer和OfferItem的实例。保存（）生成新的条目，而不是更新Django

def manage_offer(request, number=None): 
    param_offer = Offer.objects.filter(id=number).first() 
    param_items = OfferItem.objects.filter(offer=param_offer).values() 

if request.method == 'POST': 
    offer_form = OfferForm(request.POST, instance=param_offer) 
    item_formset = OfferItemFormSet(request.POST, initial=param_items) 

    if offer_form.is_valid() and item_formset.is_valid(): 

     # User selected go back and correct something 
     if request.POST.get('back', False): 

      return render(request, 
          'offer_edit.html', 
           { 
            'forms': offer_form, 
            'formset': item_formset, 
            'offer_edit': True, 
           }) 

     # Proceeds with either saving or submitting request 

     offer = offer_form.save(commit=False) 
     offer.tax = offer_form.cleaned_data['tax'].value 

     #Sotres items to be sent back to commit part 
     offer_items = [] 
     #Gets the items from the form and stores them to conf. page 
     for item_in_formset in item_formset.forms: 
      item = item_in_formset.save(commit=False) 
      item.item_code = get_item_code(item_in_formset.cleaned_data['name']) 
      item.type = get_item_type(item_in_formset.cleaned_data['name']) 
      offer.update_total(item.calc_total()) 
      # Adds items into list for invoice_ready page 
      offer_items.append(item) 

     # Request goes to confirmation page 
     if request.POST.get('proceed', False): 

      return render(request, 
          'offer_edit.html', 
           { 
            'offer_form': offer_form, 
            'item_formset': item_formset, 
            'offer_ready': True, 
            'offer': offer, 
            'items': offer_items, 
           }) 
     # Passes confirmation page and saves offer 
     offer.save() 
     # Makes sure the value is correct by recalculating 
     offer.reset_total() 

     for obj_item in offer_items: 
      obj_item.offer = offer 
      offer.update_total(obj_item.calc_total()) 
      #commits to DB 
      offer.save() 
      obj_item.save() 

     return render(request, 
         'offer_edit.html', 
          { 
           'success_add_offer': True, 
           'offer': offer, 
          }, 
        ) 

# GET generates a blank or instanced page 
else: 
    offer_form = OfferForm(initial= 
           {'company': Company.objects.filter(is_default=True).first(), 
           'tax': Tax.objects.filter(is_default=True).first() 
           }, instance=param_offer) 
    item_formset = OfferItemFormSet(initial=param_items) 

return render(request, 'offer_edit.html', 
       { 
        'forms': offer_form, 
        'formset': item_formset, 
        'edit_offer': number, 
       })

Forms.py

class OfferItemForm(ModelForm): 

class Meta: 
    model = OfferItem 
    # Some widgets and stuff ... 

class RequiredFormSet(BaseFormSet): 
    def __init__(self, *args, **kwargs): 
     super(RequiredFormSet, self).__init__(*args, **kwargs) 
     for form in self.forms: 
      form.empty_permitted = False 

OfferItemFormSet = formset_factory(OfferItemForm, formset=RequiredFormSet)

来源

2015-10-14 Ev.

你的'manage_offer'函数是否打算返回一些东西？为什么你将'number'参数设置为None？ – chem1st

因为如果没有提供号码，它将创建一个新条目而不是编辑一个。为了调试的目的，我手动将None设置为1或2，具体取决于我的输入，但仍然遇到同样的问题。 –

你有没有检查表单实际上是否将'param_offer'作为一个实例？ – chem1st

我发现了问题：因为我使用同样的搜索功能来编辑或增加新的项目，我的模板表格上我必须确保我也是确定我是否正在编辑，因为该函数在我正在编辑时需要一个参数。在这种情况下，我必须更改帖子表单中的网址。

只是一个愚蠢的错误花了我几个小时才知道。

来源

2015-10-15 10:00:14

保存（）生成新的条目，而不是更新Django

Forms.py

回答

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