On 2007-02-10 18:22:53 -0700, "johnny" <[EMAIL PROTECTED]> said:
>
> I have to include some fields from 3 different models. How do you
> create a selection field, for selecting a category data, in category
> model, using newforms?
>
> Thank You in advance.
>
>
>
The way I managed to pull this off was to use a custom form class.
class ModelInstanceForm(forms.Form):
def __init__(self, instance, data=None):
if data == None:
data = {}
for k in self.base_fields.keys():
data['%d-%s' % (instance.id, k)] =
getattr(instance, k)
self.instance = instance
super(ModelInstanceForm, self).__init__(data,
prefix=instance.id)
def save(self):
clean_data = self.clean_data
for k in self.base_fields.keys():
setattr(self.instance, k, clean_data[k])
self.instance.save()
Then you override this class with a regular form class that defines the
fields from the model you passed in.
class ProductForm(ModelInstanceForm):
display_sort = forms.IntegerField()
sku = forms.CharField(max_length=255)
name = forms.CharField(max_length=255)
is_stocked = forms.BooleanField(required=False)
So now your form object accepts an instance of a model and you can pick
and choose which ones you want to use. You can have multiple forms for
each instance. My ModelInstanceForm uses a prefix since I wrote this
code to allow a form with data in one model and a foriegn key form like
listing the products that belong to a product page. So this may not
work for you out of the box, but you can form an idea around it.
--
Brian Rosner
http://www.brosner.com/blog
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