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fix(firestore): serialize session state as JSON to avoid reserved field name errors #5549

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fix(firestore): serialize session state as JSON to avoid reserved field name errors #5549

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2a06f94
fix(firestore): serialize session state as JSON to avoid Firestore re…
nileshpatil6 Apr 29, 2026
72ebdc5
Merge branch 'main' into fix/firestore-reserved-state-keys
rohityan Apr 30, 2026
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17 changes: 13 additions & 4 deletions src/google/adk/integrations/firestore/firestore_session_service.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
from __future__ import annotations

import asyncio
import json
from contextlib import asynccontextmanager
from datetime import datetime
from datetime import timezone
Expand Down Expand Up @@ -203,7 +204,7 @@ async def create_session(
"id": session_id,
"appName": app_name,
"userId": user_id,
"state": session_state,
"state": json.dumps(session_state),
"createTime": now,
"updateTime": now,
"revision": 1,
Expand Down Expand Up @@ -314,7 +315,10 @@ async def get_session(
events.append(Event.model_validate(ed))

# Let's continue getting session.
session_state = data.get("state", {})
raw_state = data.get("state", {})
session_state = (
json.loads(raw_state) if isinstance(raw_state, str) else raw_state
)

# Fetch shared state
app_ref = self.client.collection(self.app_state_collection).document(
Expand Down Expand Up @@ -407,7 +411,12 @@ async def list_sessions(
data = doc.to_dict()
if data:
u_id = data["userId"]
s_state = data.get("state", {})
raw_s_state = data.get("state", {})
s_state = (
json.loads(raw_s_state)
if isinstance(raw_s_state, str)
else raw_s_state
)
u_state = user_states_map.get(u_id, {})
merged = self._merge_state(app_state, u_state, s_state)

Expand Down Expand Up @@ -555,7 +564,7 @@ async def _append_txn(transaction: firestore.AsyncTransaction) -> int:
transaction.update(
session_ref,
{
"state": session_only_state,
"state": json.dumps(session_only_state),
"updateTime": firestore.SERVER_TIMESTAMP,
"revision": new_revision,
},
Expand Down
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