预填充 Django 表单

Question

我正在尝试从查询中获取 Django 表单，但我一直以错误的方式进行操作。检查了几个例子，但我做的有点不同。这是我的代码，

表格

class ItemForm(ModelForm):

    class Meta:
        model = Item
        exclude = ('deleted')

以及部分视图

def index(request):
    user = User
    try:
        last_modified_list = ShoppingList.objects.filter(deleted='0').filter(owner=user).latest('date_modified')
        items = Item.objects.filter(shopping_list=last_modified_list).filter(deleted='0')
    except ObjectDoesNotExist:
        items = Item.objects.filter(deleted='0')

    last_used_currency = ExtendedUser.objects.filter(owner=user)

    #currency = forms.CharField(initial=last_used_currency.last_currency)
    try:
        last_used_shoppinglist = ShoppingList.objects.filter(deleted='0').filter(owner=user).latest('date_modified')
    except ObjectDoesNotExist:
        last_used_shoppinglist = datetime.datetime.now()

    item_form = ItemForm (request.POST or None)
    item_form.fields["shopping_list"]=last_used_shoppinglist




    if item_form.is_valid():
        name =  item_form.cleaned_data['name']
        bought =  item_form.cleaned_data['bought']
        currency = item_form.cleaned_data['currency']
        price = item_form.cleaned_data['price']
        date_added = item_form.cleaned_data['date_added']
        date_modified = item_form.cleaned_data['date_modified']
        date_bought = item_form.cleaned_data['date_bought']
        shopping_list = item_form.cleaned_data['shopping_list']
        quantity = item_form.cleaned_data['quantity']
        deleted = item_form.cleaned_data['deleted']

    return render_to_response ('base.html',{'user':user,'items':items,'item_form':item_form}, context_instance=RequestContext(request))

shopping_list 行确实导致了很多错误。

Answer 1

您想将对象作为"instance" 传递到表单中。如果我正确理解您的代码并且您有一个名为“item”的项目：

ItemForm(request.POST or None, instance=item)

不过，在这种情况下，您似乎想要一个model formset，这样您就可以一次编辑多个项目。然后，您可以将 items 变量作为“queryset”参数传递。

编辑：实际解决方案是针对不同的问题，

item_form.fields["shopping_list"].initial = last_used_shoppinglist