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.
My model is the following:
class Foo(models.Model):
title = models.CharField(max_length=50)
description = models.TextField()
and the current admin form is really nothing special
class FooAdmin(admin.ModelAdmin):
ordering = ('title',)
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.
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
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
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?
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 not kwargs.get('initial'):
kwargs['initial'] = {}
kwargs['initial'].update({'description': get_default_content()})
super(FooAdminForm, self).__init__(*args, **kwargs)
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)
if 'initial' in kwargs.keys():
kwargs['initial'].update(...
This worked for displaying the initial values and updating them - Sven 2012-12-17 14:11
initial
to an empty dict if it isn't in kwargs
- Alasdair 2012-12-17 15:47
Alasdair's approach is nice but outdated. Radev's approach looks quite nice and as mentioned in the comment, it strikes me that there is nothing about this in the documentation.
Apart from those, since Django 1.7 there is a function get_changeform_initial_data
in ModelAdmin that sets initial form values:
def get_changeform_initial_data(self, request):
return {'name': 'custom_initial_value'}
More then 3 years later, But actually what you should do is override admin.ModelAdmin formfield_for_dbfield .. like this:
class FooAdmin(admin.ModelAdmin):
def formfield_for_dbfield(self, db_field, **kwargs):
field = super(FooAdmin, self).formfield_for_dbfield(db_field, **kwargs)
if db_field.name == 'description':
field.initial = 'My initial description'
elif db_field.name == 'counter':
field.initial = get_counter() + 1
return field
Cheers;
field = super...
line, set kwargs['initial'] = 'My initial description'
(and similar for the 'counter'
field), followed by return super...
That saves a line - djvg 2019-02-19 20:30