From 9e2bd3b34d354ca85293998ae566268ef55bab31 Mon Sep 17 00:00:00 2001
From: abhishekacharya200 <abhishekacharya200@users.noreply.github.com>
Date: Fri, 16 Oct 2026 11:26:23 +0545
Subject: [PATCH] fix(oauth): save installer-latest in FileInstallationStore
 when historical data is disabled

With historical_data_enabled=False, FileInstallationStore.save() only wrote the per-user installer file, so find_installation() without a user_id never found the installation. Write the workspace-level installer-latest file as well, matching AmazonS3InstallationStore.
---
 .../oauth/installation_store/file/__init__.py | 10 +++++--
 .../oauth/installation_store/test_file.py     | 29 +++++++++++++++++++
 2 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/slack_sdk/oauth/installation_store/file/__init__.py b/slack_sdk/oauth/installation_store/file/__init__.py
index aa6f6c52d..097792389 100644
--- a/slack_sdk/oauth/installation_store/file/__init__.py
+++ b/slack_sdk/oauth/installation_store/file/__init__.py
@@ -70,10 +70,14 @@ def save(self, installation: Installation):
                 f.write(entity)
 
         else:
+            # per workspace
+            entity = json.dumps(installation.__dict__)
+            with open(f"{team_installation_dir}/installer-latest", "w") as f:
+                f.write(entity)
+
+            # per workspace per user
             u_id = installation.user_id or none
-            installer_filepath = f"{team_installation_dir}/installer-{u_id}-latest"
-            with open(installer_filepath, "w") as f:
-                entity = json.dumps(installation.__dict__)
+            with open(f"{team_installation_dir}/installer-{u_id}-latest", "w") as f:
                 f.write(entity)
 
     def save_bot(self, bot: Bot):
diff --git a/tests/slack_sdk/oauth/installation_store/test_file.py b/tests/slack_sdk/oauth/installation_store/test_file.py
index 74675452a..dbc21599f 100644
--- a/tests/slack_sdk/oauth/installation_store/test_file.py
+++ b/tests/slack_sdk/oauth/installation_store/test_file.py
@@ -1,3 +1,4 @@
+import tempfile
 import unittest
 
 from slack_sdk.oauth.installation_store import Installation, FileInstallationStore
@@ -78,6 +79,34 @@ def test_save_and_find(self):
         bot = store.find_bot(enterprise_id="E111", team_id="T222")
         self.assertIsNone(bot)
 
+    def test_save_and_find_without_historical_data(self):
+        with tempfile.TemporaryDirectory() as base_dir:
+            store = FileInstallationStore(base_dir=base_dir, client_id="111.222", historical_data_enabled=False)
+            installation = Installation(
+                app_id="A111",
+                enterprise_id="E111",
+                team_id="T111",
+                user_id="U111",
+                bot_id="B111",
+                bot_token="xoxb-111",
+                bot_scopes=["chat:write"],
+                bot_user_id="U222",
+            )
+            store.save(installation)
+
+            bot = store.find_bot(enterprise_id="E111", team_id="T111")
+            self.assertIsNotNone(bot)
+
+            i = store.find_installation(enterprise_id="E111", team_id="T111")
+            self.assertIsNotNone(i)
+            self.assertEqual(i.bot_token, "xoxb-111")
+            i = store.find_installation(enterprise_id="E111", team_id="T111", user_id="U111")
+            self.assertIsNotNone(i)
+
+            store.delete_installation(enterprise_id="E111", team_id="T111")
+            i = store.find_installation(enterprise_id="E111", team_id="T111")
+            self.assertIsNone(i)
+
     def test_org_installation(self):
         store = FileInstallationStore(client_id="111.222")
         installation = Installation(