On Jan 30, 4:57 pm, Stewart <stewart.bi...@gmail.com> wrote:
> Hi.
>
> I have a subclass of Form with some of my own methods in it, what
> would be the best way of getting those methods into a ModelForm
> subclass.
>
> For example:
>
> class MyForm(forms.Form):
> def as_span(self):
> “format form in a html span”
> return self._html_output(u'<span> %(field)s</span>’, False)
>
> class MyModelForm(forms.ModelForm):
> pass
>
> How can I get the as_span method into MyModelForm without writing it
> twice?
>
> Thanks.
This is an ideal case for mixins. A mixin is a basic class which is
'mixed in' to other classes, which inherit both the attributes of
their base class and the mixin class. So, for example, you could do:
class MyMixin(object):
def as_span(self):
....
class MyForm(forms.Form, MyMixin):
...
class MyModelForm(forms.ModelForm, MyMixin):
...
When you instantiate MyForm and MyModelForm, they will both get the
as_span method from MyMixin.
--
DR.
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