From 16d637c63f6c75d90fc3d63c6a59f642140fdda5 Mon Sep 17 00:00:00 2001
From: adeelehsan <adeel.ehsan@arbisoft.com>
Date: Wed, 23 Oct 2019 17:56:05 +0500
Subject: [PATCH] Added logs to investigate the issue

---
 openedx/core/djangoapps/user_api/models.py          | 8 ++++++++
 openedx/core/djangoapps/user_api/preferences/api.py | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/openedx/core/djangoapps/user_api/models.py b/openedx/core/djangoapps/user_api/models.py
index 256bda5b6b..7ae8de7d81 100644
--- a/openedx/core/djangoapps/user_api/models.py
+++ b/openedx/core/djangoapps/user_api/models.py
@@ -3,6 +3,8 @@ Django ORM model specifications for the User API application
 """
 from __future__ import absolute_import
 
+import logging
+
 from django.contrib.auth.models import User
 from django.core.validators import RegexValidator
 from django.db import models
@@ -30,6 +32,8 @@ from student.models import (
 )
 from util.model_utils import emit_setting_changed_event, get_changed_fields_dict
 
+log = logging.getLogger(__name__)
+
 
 class RetirementStateError(Exception):
     pass
@@ -96,7 +100,11 @@ def post_save_callback(sender, **kwargs):
     """
     Event changes to user preferences.
     """
+
     user_preference = kwargs["instance"]
+    if user_preference.key == u'pref-lang':
+        log.info(u"Updated the language for the user:{username} to {new}".format(
+            username=user_preference.user.username, new=user_preference.value))
     emit_setting_changed_event(
         user_preference.user, sender._meta.db_table, user_preference.key,
         user_preference._old_value, user_preference.value
diff --git a/openedx/core/djangoapps/user_api/preferences/api.py b/openedx/core/djangoapps/user_api/preferences/api.py
index e114aabe79..a35d1ce7ec 100644
--- a/openedx/core/djangoapps/user_api/preferences/api.py
+++ b/openedx/core/djangoapps/user_api/preferences/api.py
@@ -118,6 +118,9 @@ def update_user_preferences(requesting_user, update, user=None):
     # First validate each preference setting
     errors = {}
     serializers = {}
+    if u'pref-lang' in update.keys():
+        log.info(u"Updating site language to {pref_lang} for the user: {username}"
+                 .format(pref_lang=update['pref-lang'], username=user))
     for preference_key in update.keys():
         preference_value = update[preference_key]
         if preference_value is not None:
@@ -147,6 +150,7 @@ def update_user_preferences(requesting_user, update, user=None):
             except Exception as error:
                 raise _create_preference_update_error(preference_key, preference_value, error)
         else:
+            log.info(u"Deleting language preference  for the user: {username}".format(username=user))
             delete_user_preference(requesting_user, preference_key)