def path(self, which=None):
        """Extend ``nailgun.entity_mixins.Entity.path``.
        The format of the returned path depends on the value of ``which``:

        clone
            /api/roles/:role_id/clone

        Otherwise, call ``super``.

        """
        if which == 'clone':
            return '{0}/{1}'.format(
                super(Role, self).path(which='self'),
                which
            )
        return super(Role, self).path(which)
Extend ``nailgun.entity_mixins.Entity.path``.
        The format of the returned path depends on the value of ``which``:

        clone
            /api/roles/:role_id/clone

        Otherwise, call ``super``.