def get_router(self, context, id, fields=None):
     flavor = meta_db_v2.get_flavor_by_router(context.session, id)
     plugin = self._get_l3_plugin(flavor)
     router = plugin.get_router(context, id, fields)
     if not fields or ext_flavor.FLAVOR_ROUTER in fields:
         self._extend_router_dict(context, router)
     return router

 def delete_router(self, context, id):
     flavor = meta_db_v2.get_flavor_by_router(context.session, id)
     plugin = self._get_l3_plugin(flavor)
     return plugin.delete_router(context, id)

 def _get_flavor_by_router_id(self, context, router_id):
     return meta_db_v2.get_flavor_by_router(context.session, router_id)