在Django中使用inlineformset_factory時，將模型用戶設置爲當前用戶

Question

我已經打了一個我花了數小時努力克服的障礙，我將不勝感激一些指導。

我有兩個型號：房源和地址，具有以下結構：

class Listings(models.Model): 
    created_date = models.DateTimeField(auto_now_add=True) 
    pub_date = models.DateTimeField(auto_now_add=True) 
    address = models.ForeignKey(Addresses) 
    user = models.ForeignKey(User, on_delete=models.CASCADE) 
    is_active = models.BooleanField(default=1) 

class Addresses(models.Model): 
    address1 = models.CharField(max_length=100) 
    address2 = models.CharField(max_length=100) 
    address3 = models.CharField(max_length=100) 
    address4 = models.CharField(max_length=100) 
    postcode = models.CharField(max_length=8) 

我也有這些：

class AddressForm(ModelForm): 
    class Meta: 
     model = Addresses 
     fields = ['address1', 'address2', 'address3', 'address4', 'postcode'] 

class ListingForm(ModelForm): 
    class Meta: 
     model = Listings 
     fields = ['user'] 

我試圖創建一個表單，這將增加一個新的列表，但是輸入的唯一信息是地址模型中的字段。當表單提交時，我需要一個新的Listings對象和一個新的Addresses對象來創建，但是這個Listings對象必須有'user'外鍵等於當前登錄用戶的id。

這是視圖：

@login_required(login_url='share:login_view',   redirect_field_name='share:addlisting') 
def addlisting(request): 

    ListingInlineFormSet = inlineformset_factory(Addresses, Listings, form=ListingForm, can_delete=False, extra=1) 

    if request.method == 'POST': 

     address_form = AddressForm(request.POST) 
     if address_form.is_valid(): 
      new_address = address_form.save() 
      listing_formset = ListingInlineFormSet(request.POST, request.FILES, instance=new_address) 

      if listing_formset.is_valid(): 
       listing_formset.save() 
       return HttpResponseRedirect(reverse('/listing_added/')) 

    else: 
     address_form = AddressForm() 
     listing_formset = ListingInlineFormSet() 

    return render(request, 'share/addlisting.html', { 
     "address_form": address_form, 
     "listing_formset": listing_formset, 
    }) 

在當前狀態下，我得到一個包含所有的地址字段，再加上一個下拉用戶域的表單。提交表單時，它會創建一個包含兩個外鍵的新列表：一個用於所選用戶，另一個用於剛剛創建的新地址。這最終結果是我想要的。但是，我不希望那裏有一個下拉式用戶字段 - 我需要將用戶設置爲當前用戶。我嘗試在ListingForm類中使用「exclude = ['user']」，而不是「fields = ['user']」，但是這樣做的結果是創建一個新地址而不創建列表。所以我得到的只是一個新地址，沒有列出。

我在做什麼錯？我會很感激這個解決方案，因爲我已經把頭撞在牆上很長時間了！

Answer 1

在這種情況下，我根本不會使用formset。如果您需要收集用戶信息以創建新列表，請使用單個ListingForm和AddressForm，保存新地址，然後將ListingForm保存爲commit=False，將用戶和地址分配給它，然後保存該實例。

@login_required(login_url='share:login_view', redirect_field_name='share:addlisting') 
def addlisting(request): 
    if request.method == 'POST': 
     address_form = AddressForm(request.POST, prefix="address") 
     listing_form = ListingForm(request.POST, prefix="listing") 
     if address_form.is_valid() and listing_form.is_valid(): 
      new_address = address_form.save() 
      new_listing = listing_form.save(commit=False) 
      new_listing.address = new_address 
      new_listing.user = request.user 
      new_listing.save() 
      return HttpResponseRedirect(reverse('/listing_added/')) 
    else: 
     address_form = AddressForm(prefix="address") 
     listing_form = ListingForm(prefix="listing") 
    return render(request, 'share/addlisting.html', { 
     "address_form": address_form, 
     "listing_form": listing_form 
    }) 

如果你有Listings一個多一對多的關係，你需要明確地拯救那些保存實例後，爲這裏討論： https://docs.djangoproject.com/en/1.10/topics/forms/modelforms/#the-save-method