code: def retrieve(self, request, *args, **kwargs):
          
          return super(QuotaViewSet, self).retrieve(request, *args, **kwargs)
docs: To set quota limit issue a **PUT** request against */api/quotas/<quota uuid>** with limit values.
  
          Please note that if a quota is a cache of a backend quota (e.g. 'storage' size of an OpenStack tenant),
          it will be impossible to modify it through */api/quotas/<quota uuid>** endpoint.
  
          Example of changing quota limit:
  
          .. code-block:: http
  
              POST /api/quotas/6ad5f49d6d6c49648573b2b71f44a42b/ HTTP/1.1
              Content-Type: application/json
              Accept: application/json
              Authorization: Token c84d653b9ec92c6cbac41c706593e66f567a7fa4
              Host: example.com
  
              {
                  "limit": 2000.0
              }
  
          Example of changing quota threshold:
  
          .. code-block:: http
  
              PUT /api/quotas/6ad5f49d6d6c49648573b2b71f44a42b/ HTTP/1.1
              Content-Type: application/json
              Accept: application/json
              Authorization: Token c84d653b9ec92c6cbac41c706593e66f567a7fa4
              Host: example.com
  
              {
                  "threshold": 100.0
              }