Instead off writing an __init__ for the form class, I ended up with this 
get_form()
in my view class:

    def get_form(self, form_class=None):
        form = self.get_form_class()
        pk = self.request.user.pk
        self.object = Account.objects.get(pk=pk)
        form_instance = form(instance=self.object)
        self.filter_modelChoices(form_instance)
        return form_instance
    
    def filter_modelChoices(self, form_instance):
        """
        Changes the model choice fields to be correctly filtered
         as required by request.user.
        """
        opts = self.model._meta
        for formfield_name in form_instance.fields:
            formfield = form_instance.fields[formfield_name]
            if isinstance(formfield, ModelChoiceField):
                [modelfield] = 
                    [f for f in opts.fields if f.name == formfield_name]
                qs = userVisibleFilterQS(
                        self.request.user.pk, 
                        False,
                        modelfield.related_model())
                if qs:
                    formfield.queryset = formfield.queryset.filter(qs)


Am 16.11.2015 um 18:38 schrieb Axel Rau <axel....@chaos1.de>:

> Any idea how to add __init__() to a form class, created by modelform_factory 
> () ?


Axel
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