parametric class-based form views

Hi all,

I am trying to use generic CreateView class to handle forms for a set
of models inherited from the same base class.

class BaseContent(models.Model):
...

class XContent(BaseContent):
...

class YContent(BaseContent):
...

To keep things DRY, I want to define one CreateView class that will
handle all inherited classes from BaseContent.

The url pattern for that view is:

url(r'^content/add/(?P<model_name>\w+)/$',
ContentCreateView.as_view(), name='content_add')

Something like this should work:

class ContentCreateView(CreateView):
template_name = 'content_form.html'

def get_model(self, request):
# 'content' is the name of the application; model_name is
'xcontent', 'ycontent', ...
return ContentType.objects.get_by_natural_key('content',
self.model_name)

But I am getting this exception:

ContentCreateView is missing a queryset. Define
ContentCreateView.model, ContentCreateView.queryset, or override
ContentCreateView.get_object().

This suggestion does not seem to hold as I am not willing to set a
class attribute like `model` or `queryset` to keep the model form
generated dynamic. Overriding the `get_object` does not seem relevant
for creating an object.

I tried overriding `get_queryset()` but this method does not accept
the `request` parameter, nor have access to `self.model_name` which
comes from the url pattern.

So, (how) can I make a CreateView use a dynamic form based on a
parameter passed from the url?

Thanks,
oMat

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