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Django: cleaning and validating FORMS that are interdependent

Django docs cover cleaning up and checking fields that are dependent on each other , but I can't find anything that covers forms that are dependent on each other.

I have one HTML form that contains both the standard django form and the django form. The correct check of each form in the form set is completely conditional based on the value from the main form (for example, check the box in the main form, and a special field in each form in the form set will suddenly become necessary).

My intuition is to “just” pass the entire main form into a form validation call, for example:

def my_view(request):
    MyFormSet = formset_factory(MyForm, extra=2, can_order=True)

    if request.method == 'POST':
        form = MainForm(request.POST)
        formset = MyFormSet(request.POST)

        if form.is_valid() and formset.is_valid(form): # <-- ?!?!
            # The formset is now validated based on the form

, , , formet is_valid(), is_valid() clean(). , .

?

+5
2

, , Ted answer (django 1.3):

class BaseMyFormSet(BaseFormSet):
    main_form = None

    def __init__(self, *args, **kwargs):
        # Save the main form until validation
        if kwargs.has_key('main_form'):
            self.main_form = kwargs.pop('main_form')

        super(BaseMyFormSet, self).__init__(*args, **kwargs)

    def clean(self):
        if any(self.errors):
            # Don't bother validating the formset unless each 
            # form is valid on its own
            return

        checkbox = self.main_form.cleaned_data['my_checkbox']

        if checkbox:
            for form in self.forms:
                # Do some extra validation


def my_view(request):
    MyFormSet = formset_factory(MyForm, extra=2, can_order=True,
        formset=BaseMyFormSet)

    if request.method == 'POST':
        form = MainForm(request.POST)
        formset = MyFormSet(request.POST, main_form=form)

        if form.is_valid() and formset.is_valid():
            # The formset is now validated based on the form
+6

, http://yergler.net/blog/2009/09/27/nested-formsets-with-django/ .

:

def my_view(request):
MyFormSet = formset_factory(MyForm, extra=2, can_order=True)

if request.method == 'POST':
    form = MainForm(request.POST)
    formset = MyFormSet(request.POST, other_form = form)

    if form.is_valid() and formset.is_valid(): # <-- ?!?!
        # The formset is now validated based on the form


class MyFormSet(...):

   def __init__(self, *args, **kwargs):
       if kwargs.has_key('other_form'):
           self.myformforlater = kwargs.pop('other_form')
       Super(MyFormSet, self).__init__(*args, **kwargs)

, init, .

+8

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