def require(self, perm_name, **kwargs):
        """Use as a decorator on a view to require a permission.

        Optional args:

            - ``field`` The name of the model field to use for lookup
              (this is only relevant when requiring a permission that
              was registered with ``model=SomeModelClass``)

        Examples::

            @registry.require('can_do_stuff')
            def view(request):
                ...

            @registry.require('can_do_stuff_with_model', field='alt_id')
            def view_model(request, model_id):
                ...

        """
        view_decorator = self._get_entry(perm_name).view_decorator
        return view_decorator(**kwargs) if kwargs else view_decorator