'Returns a merged dictionary of all step cleaned_data dictionaries.
If a step contains a `FormSet`, the key will be prefixed with
\'formset-\' and contain a list of the formset cleaned_data dictionaries.'

def get_all_cleaned_data(self):

    cleaned_data = {}
    for form_key in self.get_form_list():
        form_obj = self.get_form(step=form_key, data=self.storage.get_step_data(form_key), files=self.storage.get_step_files(form_key))
        if form_obj.is_valid():
            if isinstance(form_obj.cleaned_data, (tuple, list)):
                cleaned_data.update({('formset-%s' % form_key): form_obj.cleaned_data})
            else:
                cleaned_data.update(form_obj.cleaned_data)
    return cleaned_data
