Django:添加一个“添加新的"ModelForm 中外键的按钮 [英] Django: adding an "Add new" button for a ForeignKey in a ModelForm

问题描述

TL;DR:如何为 ModelForm 中的外键添加添加新"按钮?

TL;DR: How can I add an "Add new" button for a ForeignKey in a ModelForm?

长版:我在一个项目中使用 Django 1.7.我的models.py中有这两个模型

Long version: I'm using Django 1.7 for a project. I have these two Models in my models.py

class Client(models.Model):
    name = models.CharField(max_length=100)

class Order(models.Model):
    code = models.IntegerField()
    client = models.ForeignKey(Client)

[其他一些不相关的字段被省略]

我正在使用 ModelForm 用新订单填充数据库，如下所示:

I am using a ModelForm to populate the db with new orders, like this:

class OrderNewForm(forms.ModelForm):
    class Meta:
        model = Order

Django 在为客户端字段添加下拉菜单方面做得非常好，用从客户端获取的条目填充它.尽管如此，我还是希望有一个添加新客户"链接/按钮/任何东西，以便在添加相关订单的同时添加一个全新的客户.

Django does quite a good job at adding a dropdown menu for the client field, populating it with entries taken from Client. Nevertheless, I'd like to have an "Add new client" link/button/whatever to add a brand new client at the same time I add a related Order.

Django 管理员会自动执行此操作，添加一个+"按钮来打开一个弹出窗口，但我在上面的 ModelForm 中找不到一种简单的方法来执行此操作.我在这里阅读了许多问题并在别处阅读了链接，但没有什么能真正帮助我.对此有任何想法吗?

Django admin does that automatically, adding a "+" button" that opens a popup, but I couldn't find an easy way to do that in a ModelForm like the one above. I read many questions here and links elsewhere, but nothing really helped me. Any idea about that?

推荐答案

我已经在自定义小部件中解决了它.我不记得我是从 Django 管理员那里得到了一部分，还是从头开始构建.

I have solved it in a custom widget. I don't remember if I took parts from Django admin, or I have built from scratch.

所以表格将是:

class OrderNewForm(forms.ModelForm):

   client = forms.ModelChoiceField(
       required=False,
       queryset=Client.objects.all(),
       widget=RelatedFieldWidgetCanAdd(Client, related_url="so_client_add")
                                )
   class Meta:
       model = Order
       fields = ('code', 'client')

呈现+"按钮并链接到管理界面中的添加弹出窗口或您使用 related_url 参数提供的自定义视图的小部件是:

And the widget, that renders the "+" button and link to the add popup in the admin interface or to a custom view you provice with the related_url argument is:

from django.core.urlresolvers import reverse
from django.utils.safestring import mark_safe
from django.forms import widgets
from django.conf import settings

class RelatedFieldWidgetCanAdd(widgets.Select):

    def __init__(self, related_model, related_url=None, *args, **kw):

        super(RelatedFieldWidgetCanAdd, self).__init__(*args, **kw)

        if not related_url:
            rel_to = related_model
            info = (rel_to._meta.app_label, rel_to._meta.object_name.lower())
            related_url = 'admin:%s_%s_add' % info

        # Be careful that here "reverse" is not allowed
        self.related_url = related_url

    def render(self, name, value, *args, **kwargs):
        self.related_url = reverse(self.related_url)
        output = [super(RelatedFieldWidgetCanAdd, self).render(name, value, *args, **kwargs)]
        output.append(u'<a href="%s" class="add-another" id="add_id_%s" onclick="return showAddAnotherPopup(this);"> ' % 
            (self.related_url, name))
        output.append(u'<img src="%sadmin/img/icon_addlink.gif" width="10" height="10" alt="%s"/></a>' % (settings.STATIC_URL, _('Add Another')))                                                                                                                               
       return mark_safe(u''.join(output))

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