Django表单：首先需要？ [英] Django formsets: make first required?

问题描述

这些表单正好展示了我想要的相反的行为。

我的观点设置如下：

  def post（request）：＃TODO：handle vehicle formset 
 VehicleFormSetFactory = formset_factory（VehicleForm，extra = 1）
 if request.POST：
 vehicles_formset = VehicleFormSetFactory（request.POST）
 else：
 vehicles_formset = VehicleFormSetFactory（）
  

我的模板看起来像这样：

 < div id =vehicle_forms> ; 
 {{vehicles_formset.management_form}} 
 {％for vehicles in form_formset.forms％} 
< h4> Vehicle {{forloop.counter}}< / h4> 
< table> 
 {％includeform.html％} 
< / table> 
 {％endfor％} 
< / div> 
  

这样它最初只生成一个表单，就像我想要的一样。但是我想要一个表单被要求！

当我用JavaScript和 cars_formset.empty_form动态添加空白表单所有这些额外的表格是必需的，我不想要的。

从文档中：

表单非常聪明，可以忽略未更改的额外表单。

这是第一种表现形式（不是我想要的）的行为，而不是额外的表现形式的行为（什么

有没有一些属性我可以改变至少使一个需要？

解决方案

找到一个更好的解决方案：

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

然后创建这样的表单集：

  MyFormSet = formset_factory（MyForm，formset = RequiredFormSet）
  

我真的不知道为什么这不是一个开始的选择，但是，无论如何。只需要几个小时的时间才能弄清楚。

这将使所有的表单都需要。您可以通过将 self.forms [0] .empty_permitted 设置为 False 。 >

These formsets are exhibiting exactly the opposite behavior that I want.

My view is set up like this:

def post(request): # TODO: handle vehicle formset
    VehicleFormSetFactory = formset_factory(VehicleForm, extra=1)
    if request.POST:
        vehicles_formset = VehicleFormSetFactory(request.POST)
    else:
        vehicles_formset = VehicleFormSetFactory()

And my template looks like this:

    <div id="vehicle_forms">
        {{ vehicles_formset.management_form }}
        {% for form in vehicles_formset.forms %}
            <h4>Vehicle {{forloop.counter}}</h4>
            <table>
                {% include "form.html" %}
            </table>
        {% endfor %}
    </div>

That way it initially generates only 1 form, like I want. But I want that one form to be required!

When I dynamically add blank forms with JavaScript and vehicles_formset.empty_form all those extra forms are required, which I don't want.

From the docs:

The formset is smart enough to ignore extra forms that were not changed.

This is the behavior the first form is exhibiting (not what I want) but not the behavior that the extra forms are exhibiting (what I do want).

Is there some attribute I can can change to at least make one form required?

解决方案

Found a better solution:

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

Then create your formset like this:

MyFormSet = formset_factory(MyForm, formset=RequiredFormSet)

I really don't know why this wasn't an option to begin with... but, whatever. It only took a few hours of my life to figure out.

This will make all the forms required. You could make just the first one required by setting self.forms[0].empty_permitted to False.

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