From 73e2843cf1b4dba5bdec7968fff64656d929db53 Mon Sep 17 00:00:00 2001
From: Silvano Cerza <3314350+silvanocerza@users.noreply.github.com>
Date: Thu, 9 Nov 2023 16:50:06 +0100
Subject: [PATCH] Fix deprecation warning when calling Document.from_dict()
 (#6267)

---
 haystack/preview/dataclasses/document.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/haystack/preview/dataclasses/document.py b/haystack/preview/dataclasses/document.py
index 51e9a1ed7..644d12cfe 100644
--- a/haystack/preview/dataclasses/document.py
+++ b/haystack/preview/dataclasses/document.py
@@ -1,3 +1,4 @@
+import io
 import hashlib
 import logging
 from dataclasses import asdict, dataclass, field, fields
@@ -145,7 +146,7 @@ class Document(metaclass=_BackwardCompatible):
         `dataframe` and `blob` fields are converted to their original types.
         """
         if (dataframe := data.get("dataframe")) is not None:
-            data["dataframe"] = pandas.read_json(dataframe)
+            data["dataframe"] = pandas.read_json(io.StringIO(dataframe))
         if blob := data.get("blob"):
             data["blob"] = ByteStream(data=bytes(blob["data"]), mime_type=blob["mime_type"])
         return cls(**data)