@@ -67,7 +67,7 @@ def search_one(cls, vector, meta_conditions, top) -> List[Tuple[int, float]]:
 conditions = cls.parser.parse(meta_conditions)
 hybrid_policy = ""
 if cls.hybrid_policy != "":
-hybrid_policy = '=>{$HYBRID_POLICY: {'+ cls.hybrid_policy + '}'
+hybrid_policy = f"=>{{$HYBRID_POLICY: {{{cls.hybrid_policy}}}}}"
 if conditions is None:
 prefilter_condition = "*"
 params = {}