fix:import-duplicate-usernames

kolibri/core/auth/management/commands/bulkimportusers.py

@@ -272,9 +272,13 @@ def get_username(self, row):
         username = row.get(self.header_translation["USERNAME"])
         lowercase_username = username.lower()
 
+        # Check if a user with the provided username exists (case-insensitive)
+        existing_user = FacilityUser.objects.filter(username__iexact=lowercase_username).first()
+        # Convert existing keys in self.users to lowercase
+        if existing_user:
+            return None  # Duplicate username
         # Convert existing keys in self.users to lowercase
         lowercase_users = {key.lower(): value for key, value in self.users.items()}
-
         if lowercase_username in lowercase_users:
             return None  # Duplicate username