Tuesday, May 5, 2009

EuroDjangoCon 2009

EuroDjangoCon 2009 is still going strong, but I wanted to share the materials from my talk as quickly as possible. My slides are on Slide Share:

And the first examples code follows:

from django.forms.util import ErrorList
from django.utils.datastructures import SortedDict

def multiple_form_factory(form_classes, form_order=None):
if form_order:
form_classes = SortedDict([(prefix, form_classes[prefix]) for prefix in
form_classes = SortedDict(form_classes)
return type('MultipleForm', (MultipleFormBase,), {'form_classes': form_classes})

class MultipleFormBase(object):
def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
initial=None, error_class=ErrorList, label_suffix=':',
if prefix is None:
prefix = ''
self.forms = [form_class(data, files, auto_id, prefix + form_prefix,
initial[i], error_class, label_suffix, empty_permitted) for
i, (form_prefix, form_class) in enumerate(self.form_classes.iteritems())]

def __unicode__(self):
return self.as_table()

def __iter__(self):
for form in self.forms:
for field in form:
yield field

def is_valid(self):
return all(form.is_valid() for form in self.forms)

def as_table(self):
return '\n'.join(form.as_table() for form in self.forms)

def as_ul(self):
return '\n'.join(form.as_ul() for form in self.forms)

def as_p(self):
return '\n'.join(form.as_p() for form in self.forms)

def is_multipart(self):
return any(form.is_multipart() for form in self.forms)

def save(self, commit=True):
return tuple(form.save(commit) for form in self.forms)
save.alters_data = True

EuroDjangoCon has been a blast thus far and after the conference I'll do a blogpost that does it justice.


  1. So how would this work with foreign key dependencies? Lets say you are filling out a contact form which contains a contact model with foreign keys for the user model and the location model.

  2. Hi Alex,

    thanks for sharing this - I think, it's a pretty interesting idea.

    However, when I use the code displayed above(which is different from the slides code), I experience some problems.

    First thing I noticed:
    '... i, form_prefix, form_class in enumerate(self.form_classes)...' in __init__.
    I get a ValueError saying 'need more than 2 values to unpack'.
    After working around this, I got stuck with several other things(probably caused by my workarounds :)

    Could you maybe have a look into this?

    Thanks again!


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