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

问题描述

这些表单集展示了我想要的相反行为.

我的视图是这样设置的:

def post(request): # TODO: 处理车辆表单集VehicleFormSetFactory = formset_factory(VehicleForm, extra=1)如果请求.POST:Vehicles_formset = VehicleFormSetFactory(request.POST)别的:Vehicle_formset = VehicleFormSetFactory()

我的模板如下所示:

 
{{ Vehicle_formset.management_form }}{% for form in vehicle_formset.forms %}<h4>车辆{{forloop.counter}}</h4><表格>{% 包含 "form.html" %}{% 结束为 %}

这样它最初只生成 1 个表单，就像我想要的那样.但我希望需要一种形式！

当我使用 JavaScript 和 vehicles_formset.empty_form 动态添加空白表单时，所有这些额外的表单都是必需的，我不想要.

来自文档:

<块引用>

表单集足够智能，可以忽略未更改的额外表单.

这是第一个表单表现出的行为(不是我想要的)，但不是额外表单表现出的行为(我想要的).

是否有一些我可以更改的属性，至少可以使一个表单成为必需?

解决方案

找到了更好的解决方案:

class RequiredFormSet(BaseFormSet):def __init__(self, *args, **kwargs):super(RequiredFormSet, self).__init__(*args, **kwargs)对于 self.forms 中的表单:form.empty_permitted = False

然后像这样创建你的表单集:

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.我只用了几个小时就搞清楚了.

这将使所有表格成为必需.您可以通过将 self.forms[0].empty_permitted 设置为 False 来制作所需的第一个.

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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