MultiForm and MultiModelForm
Based on a PrefixDict class I wrote and thus very lean. Lacks a little documentation, though
class MyMultiForm(ModelMultiForm):
class Meta:
localized_fields = '__all__'
form_classes = OrderedDict((
('form1', Form1),
('form2', Form2),
))
Subfields are named form-name
prefix_sep
subfield-name
. prefix_sep
defaults to -
. For access in templates, use form.varfields
, which uses var_prefix_sep
(default: _
), instead.
multiform.varfields()['form1_field1']
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from collections import OrderedDict
from django.core.exceptions import NON_FIELD_ERRORS
from django.forms import BaseForm
from django.forms.utils import ErrorList
from django.utils.safestring import mark_safe
from .prefixdict import PrefixCombiningDict
class MultiForm(BaseForm):
PREFIX_SEP = '-'
VAR_PREFIX_SEP = '__'
base_fields = {}
def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
initial=None, error_class=ErrorList, label_suffix=None,
empty_permitted=False,
**kwargs
):
self.prefix_sep = self.PREFIX_SEP
self.var_prefix_sep = self.VAR_PREFIX_SEP
super(MultiForm, self).__init__(data=data, files=files,
auto_id=auto_id, prefix=prefix, initial=initial, error_class=error_class, label_suffix=label_suffix,
empty_permitted=empty_permitted
)
self._init_subforms(data=data, initial=initial, label_suffix=label_suffix, **kwargs)
self.fields = PrefixCombiningDict(((prefix, form.fields) for prefix, form in self.forms.iteritems() if form.fields), sep=self.prefix_sep)
def _init_subforms(self, data=None, files=None, auto_id='id_%s',
prefix=None, initial=None, error_class=ErrorList, label_suffix=None,
empty_permitted=False, **kwargs
):
if not prefix:
prefix = ''
form_classes = self.get_form_classes()
if len(form_classes) == 0:
raise ValueError("Need at least one form class for MultiForm")
forms = OrderedDict()
for key, form_class in form_classes.iteritems():
sub_initial = initial.get(key) if initial else None
sub_prefix = prefix + key
sub_kwargs = {kw_key: kw_value[key] for kw_key, kw_value in kwargs.iteritems() if key in kw_value}
forms[key] = self.create_form(
form_class,
data=data, files=files, auto_id=auto_id,
prefix=sub_prefix, initial=sub_initial, error_class=error_class,
label_suffix=label_suffix, empty_permitted=empty_permitted,
**sub_kwargs
)
self.forms = forms
def create_form(self,
form_class,
data=None, files=None, auto_id=None,
prefix=None, initial=None, error_class=None,
label_suffix=None, empty_permitted=None,
*args, **kwargs
):
return form_class(
data=data, files=files, auto_id=auto_id,
prefix=prefix, initial=initial, error_class=error_class,
label_suffix=label_suffix, empty_permitted=empty_permitted,
*args, **kwargs
)
def full_clean(self):
for form in self.forms.itervalues():
if form:
form.full_clean()
self.cleaned_data = PrefixCombiningDict(
((prefix, form.clean()) for prefix, form in self.forms.iteritems() if form and form.is_valid()),
sep=self.prefix_sep
)
self._errors = {NON_FIELD_ERRORS: []}
for prefix, form in (form for form in self.forms.iteritems() if form):
for field, errors in form.errors.iteritems():
if field == NON_FIELD_ERRORS:
self._errors[NON_FIELD_ERRORS].extend(errors)
else:
self._errors[prefix + self.prefix_sep + field] = errors
return self.cleaned_data
def get_form_classes(self):
try:
return self.form_classes
except NameError:
raise NameError('Subclasses must set form_classes or override get_form_classes()')
def __unicode__(self):
return mark_safe(u"\n".join(unicode(form) for form in self.forms.itervalues()))
def __str__(self):
return mark_safe("\n".join(str(form) for form in self.forms.itervalues()))
def __iter___(self):
for name in self.fields:
yield self[name]
def __getitem__(self, key):
return PrefixCombiningDict(((prefix, form) for prefix, form in self.forms.iteritems() if form), sep=self.prefix_sep)[key]
@property
def varfields(self):
return PrefixCombiningDict(((prefix, form) for prefix, form in self.forms.iteritems() if form), sep=self.var_prefix_sep)
def is_valid(self):
self.full_clean()
return all(form.is_valid() for form in self.forms.itervalues())
class ModelMultiForm(MultiForm):
def create_form(self,
form_class,
data=None, files=None, auto_id=None,
prefix=None, initial=None, instance=None,
error_class=None, label_suffix=None, empty_permitted=None,
*args, **kwargs
):
if instance:
return form_class(data=data, prefix=prefix, initial=initial, instance=instance, *args, **kwargs)
else:
return form_class(data=data, prefix=prefix, initial=initial, *args, **kwargs)
@property
def instance(self):
return dict((prefix, form.instance) for prefix, form in self.forms.iteritems() if form)
def save(self, commit=True):
return dict((key, form.save(commit=commit)) for key, form in self.forms.iteritems() if form)
|
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Comments
create a simple example of how to use it
#
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