Returns True if the given request has permission to add an object.
        Can be overriden by the user in subclasses.

def has_add_permission(self, request):
        """
        Returns True if the given request has permission to add an object.
        Can be overriden by the user in subclasses.
        """
        opts = self.opts
        return request.user.has_perm(opts.app_label + '.' + opts.get_add_permission())