如何在Django中添加N个动态表单字段而不使用javascript/ajax？

Question

我有一个模型是这样的：

class AddCoffee(models.Model):
    user = models.CharField(max_length=50)
    coffee_name = models.CharField(max_length=50)
    coffee_price = models.CharField(max_length=10)

现在，从这个模型中，我得到了所有的coffee_name：

coffee_names = AddCoffee.objects.values_list('coffee_name', flat=True)

现在，我想做的是（即使这里有一些密切相关的话题，我也找不到任何方法）：

• 生成len(coffee_names)ChoiceField，标签是每个咖啡名，值是从0到50的列表。像这样：

  class RequestCoffeeForm(forms.Form):
      coffee_names = AddCoffee.objects.values_list('coffee_name', flat=True)
  
      for name in coffee_names:
          forms.ChoiceField(label="{}".format(name),
                            choices=[x for x in range(51)])
  
      """
      Suppose coffee_names = ["ABC", "DEF"]
  
      I should have two `ChoiceFields` as follows:
  
      ABC = forms.ChoiceField(label="ABC", choices=[x for x in range(51)])
      DEF = forms.ChoiceField(label="DEF", choices=[x for x in range(51)])
      """
  

我怎样才能做到这一点？关于以后如何将这些动态字段存储在模型/视图中，我的脑子里有些模棱两可。你知道吗

---

我试过：

class RequestCoffeeForm(forms.Form):
    coffee_names = AddCoffee.objects.values_list('coffee_name', flat=True)

    for name in coffee_names:
        name = forms.ChoiceField(label="{}".format(name), choices=((str(x), x) for x in range(51)))

在我看来：

@login_required(login_url="login/")
def request_coffee_page(request):
    form = RequestCoffeeForm(request.POST or None)

    return render(request, "request_coffee.html", {'form': form})

然后在我的模板中：

{{ form.name.label_tag }}
{{ form.name }}

上面只打印最后一个咖啡名。我怎样才能把它们全部打印出来？你知道吗

Answer 1

class RequestCoffeeForm(forms.Form):
    COFFEE_CHOICES = []
    coffee_names = AddCoffee.objects.values_list('coffee_name', flat=True)

    for name in coffee_names:
        COFFEE_CHOICES.append((str(name).lower(), str(name)))
    forms.ChoiceField(choices=CHOICES_LIST)

choices必须是iterable of 2-tuples。有关示例，请参见here。你知道吗

Answer 2

我没时间试一下，但这可能有用吗

class RequestCoffeeForm(forms.Form):
    def __init__(self, *args, **kwargs):
        super(RequestCoffeeForm, self).__init__(*args, **kw)

        choices = [(str(x), x) for x in range(51)]
        # store it as attribute in case we need it later...
        self.coffee_names = AddCoffee.objects.values_list('coffee_name', flat=True)

        for name in self.coffee_names:
            self.fields[coffee_name] = forms.ChoiceField(
                label=coffee_name, choices=choices
                )