def get_form(self, request, obj=None, **kwargs):
        '''
        Overwrite get_form to select the currently logged in user as the author
        '''
        form = super(PostAdmin, self).get_form(request, obj, **kwargs)
        user = request.user
        if user.is_superuser:
            f = form.base_fields['author']
            f.queryset = User.objects.filter(is_staff=True)
            if not f.initial:
                f.initial=request.user.pk
        else:
            form.base_fields['author'] = forms.CharField(initial=request.user.pk,
                                                         widget=forms.HiddenInput())
        return form