Help with Dynamic ChoiceField

Hi,

I am trying to fill in choices for MultipleChoiceField in runtime.  I am using formWizard and trying to return the dictionary using get_form_kwargs.

I am able set the initial for CharField but not choices for MultipleChoiceField.  I am trying to show up dynamic choices based on the user's input in first form. This choices will be calculated using form 1 cleaned_data.



views.py
--------

class SelectWizard(SessionWizardView):
   
    def get_form_initial(self, step):
        if step == 'select':
            initial={'release_id': 'Major.Minor.Patch'}
            return initial
        return self.initial_dict.get(step, {})
   
    def get_form_kwargs(self, step=None):
        if step == 'select':
            # Calculate the choices here from form 1 cleaned data

            '''
            cd = self.get_cleaned_data_for_step('main')

            '''

            return {'data': {'choices': (('1', 'Option1'), ('2','Option2'))},} # Manual for now

        return {}
   
    def done(self, form_list, **kwargs):
        # do something
        return HttpResponseRedirect('/queued/')


-----
forms.py

class Selection(forms.Form):

    def __init__(self, *args, **kwargs):
        print 'kwargs', kwargs
        super(Selection, self).__init__(*args, **kwargs)
        self.fields['release_id'] = forms.CharField(initial=kwargs['initial']['release_id'])
        self.fields['choose_items'] = forms.MultipleChoiceField(choices=(('3', 'Option3'), ('4', 'Option4')))
        # choices_tuple = kwargs['data']['choices']
        # self.fields['choose_items'] = forms.MultipleChoiceField(choices=choices_tuple)        
           
    release_id = forms.CharField()
    choose_items = forms.MultipleChoiceField()


-----


Console o/p.

kwargs {'files': None, 'prefix': 'select', 'initial': {'release_id': 'Major.Minor.Patch'}, 'data': None}


Django debugging output




TypeError at /

'NoneType' object has no attribute '__getitem__'

Request Method:	POST
Request URL:	http://127.0.0.1:8000/
Django Version:	1.4.1
Exception Type:	TypeError
Exception Value:	'NoneType' object has no attribute '__getitem__'

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