如何为 Django 管理模型添加实例表单设置初始数据? [英] How to set initial data for Django admin model add instance form?

问题描述

如何在自动生成的表单中设置字段的初始值以在显示表单之前添加Django模型实例?我正在使用 Django 1.3.1.

How can I set an initial value of a field in the automatically generated form for adding a Django model instance, before the form is displayed? I am using Django 1.3.1.

我的模型如下:

class Foo(models.Model):
  title = models.CharField(max_length=50)
  description = models.TextField()

目前的管理表单真的没什么特别的

and the current admin form is really nothing special

class FooAdmin(admin.ModelAdmin):
  ordering = ('title',)

当我使用管理页面添加 Foo 的新实例时，我得到一个漂亮的表单，其中包含用于标题和描述的空字段.我想要的是使用我通过调用函数获得的模板来设置描述字段.

When I use the admin page to add a new instance of Foo, I get a nice form with empty fields for title and description. What I would like is that the description field is set with a template that I obtain by calling a function.

我目前最好的尝试是这样的:

My current best attempt at getting there is this:

def get_default_content():
  return 'this is a template for a Foo description'

class FooAdminForm(django.forms.ModelForm):

  class Meta:
      model = Foo

  def __init__(self, *args, **kwargs):
      kwargs['initial'].update({'description': get_default_content()})
      super(FooAdminForm, self).__init__(self, *args, **kwargs)

class FooAdmin(admin.ModelAdmin):
  ordering = ('title',)
  form = FooAdminForm

但是如果我尝试这个，我会得到这个 Django 错误:

but if I try this I get this Django error:

AttributeError at /admin/bar/foo/add/ 
   'FooForm' object has no attribute 'get'
Request Method: GET
Request URL:    http://localhost:8000/admin/bar/foo/add/
Django Version: 1.3.1
Exception Type: AttributeError
Exception Value:    'FooForm' object has no attribute 'get'
Exception Location: /www/django-site/venv/lib/python2.6/site-packages/django/forms/widgets.py in value_from_datadict, line 178

我不知道这里出了什么问题，我应该怎么做才能让它发挥作用.我还发现这个错误的奇怪之处(除了我看到它的事实)是我的代码中根本没有 FooForm?

I don't know what is wrong here, and what I should do to make it work. What I also find strange about this error (apart from the fact that I see it at all) is that there is no FooForm in my code at all?

推荐答案

您需要在 __init__ 方法定义中包含 self 作为第一个参数，但不应包含当你调用超类的方法时.

You need to include self as the first argument in your __init__ method definition, but should not include it when you call the superclass' method.

def __init__(self, *args, **kwargs):
    # We can't assume that kwargs['initial'] exists! 
    if 'initial' not in kwargs:
        kwargs['initial'] = {}
    kwargs['initial'].update({'description': get_default_content()})
    super(FooAdminForm, self).__init__(*args, **kwargs)

话虽如此，模型字段可以为其默认，因此您可能根本不必定义自定义管理表单.

Having said that, a model field can take a callable for its default, so you may not have to define a custom admin form at all.

class Foo(models.Model):
    title = models.CharField(max_length=50)
    description = models.TextField(default=get_default_content)

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