Super Basic Django MultiValueField / MutliWidget example

Basic MultiValueField MultiWidget

"""
An example of minimum requirements to make MultiValueField-MultiWidget for Django forms.
"""
import pickle

from django.http import HttpResponse
from django import forms
from django.template import Context, Template
from django.views.decorators.csrf import csrf_exempt


class MultiWidgetBasic(forms.widgets.MultiWidget):
    def __init__(self, attrs=None):
        widgets = [forms.TextInput(),
                   forms.TextInput()]
        super(MultiWidgetBasic, self).__init__(widgets, attrs)

    def decompress(self, value):
        if value:
            return pickle.loads(value)
        else:
            return ['', '']


class MultiExampleField(forms.fields.MultiValueField):
    widget = MultiWidgetBasic

    def __init__(self, *args, **kwargs):
        list_fields = [forms.fields.CharField(max_length=31),
                       forms.fields.CharField(max_length=31)]
        super(MultiExampleField, self).__init__(list_fields, *args, **kwargs)

    def compress(self, values):
        ## compress list to single object                                               
        ## eg. date() >> u'31/12/2012'                                                  
        return pickle.dumps(values)


class FormForm(forms.Form):
    a = forms.BooleanField()
    b = forms.CharField(max_length=32)
    c = forms.CharField(max_length=32, widget=forms.widgets.Textarea())
    d = forms.CharField(max_length=32, widget=forms.widgets.SplitDateTimeWidget())
    e = forms.CharField(max_length=32, widget=MultiWidgetBasic())
    f = MultiExampleField()


@csrf_exempt
def page(request):
    form = FormForm()
    if request.method == 'POST':
        form = FormForm(request.POST)

    t = Template("""<form method="post" action=".">{{f}}<input type="submit"><form>""")
    c = {'f': form.as_p()}
    return HttpResponse(t.render(Context(c)))