django model/modelForm - How to get dynamic choices in choiceField?

Question

i\'m experimenting with django and the builtin admin interface.

I basically want to have a field that is a drop down in the admin UI. The drop down choices should be

Answer 1

I use a generator:

see git://gist.github.com/1118279.git

    import pysvn

    class SVNChoices(DynamicChoice):
        """
        Generate a choice from somes files in a svn repo
        """"
        SVNPATH = 'http://xxxxx.com/svn/project/trunk/choices/'
        def generate(self):
            def get_login( realm, username, may_save ):
                return True, 'XXX', 'xxxxx', True
            client = pysvn.Client()
            client.callback_get_login = get_login
            return [os.path.basename(sql[0].repos_path) for sql in client.list(self.SVNPATH)[1:]]

Answer 2

Yay solved. after beating my head all day and going through all sorts of examples by people i got this to work.

basically i had the right idea with #2. The steps are
- Create a ModelForm of our model - override the default form field user for a models.CharField. i.e. we want to explcitly say use a choiceField.
- Then we have to override how the form is instantiated so that we call the thing we want to use to generate our dynamic list of choices
- then in our ModelAdmin make sure we explicitly tell the admin to use our ModelForm

class Test1(models.Model):
    test_folder_ddl  = models.CharField(max_length=100)


class Test1Form(ModelForm):
    test_folder_ddl = forms.choiceField()

    def __init__(self, *args, **kwargs):
       super(Test1Form, self).__init__(*args, **kwargs)
       self.fields['test_folder_ddl'].choices = utility.get_folder_list()

class Test1Admin(admin.ModelAdmin):
    form = Test1Form