'AutoCompleteSelectWidget' object has no attribute 'choices'

[mrinvest]

Getting the following error with Django 1.7 and AjaxSelectAdmin

'AutoCompleteSelectWidget' object has no attribute 'choices'

Here is the stack

        form = super(AjaxSelectAdmin, self).get_form(request, obj, **kwargs) ...
local/lib/python2.7/site-packages/django/contrib/admin/options.py in get_form
            return modelform_factory(self.model, **defaults) ...
local/lib/python2.7/site-packages/django/forms/models.py in modelform_factory
    return type(form)(class_name, (form,), form_class_attrs) ...
local/lib/python2.7/site-packages/django/forms/models.py in __new__
                                      opts.help_texts, opts.error_messages) ...
local/lib/python2.7/site-packages/django/forms/models.py in fields_for_model
            formfield = formfield_callback(f, **kwargs) ...
local/lib/python2.7/site-packages/django/contrib/admin/options.py in formfield_for_dbfield
                    can_add_related=can_add_related) ...
local/lib/python2.7/site-packages/django/contrib/admin/widgets.py in __init__
        self.choices = widget.choices ...