ephraimbuddy commented on a change in pull request #18757:
URL: https://github.com/apache/airflow/pull/18757#discussion_r723029378



##########
File path: airflow/api_connexion/endpoints/user_endpoint.py
##########
@@ -124,9 +124,21 @@ def patch_user(username, update_mask=None):
     if user is None:
         detail = f"The User with username `{username}` was not found"
         raise NotFound(title="User not found", detail=detail)
-
-    # Get fields to update. 'username' is always excluded (and it's an error to
-    # include it in update_maek).
+    # Check unique username
+    new_username = data.get('username')
+    if new_username:
+        usr = security_manager.find_user(username=new_username)
+        if usr and usr != user:
+            raise AlreadyExists(detail=f"The username `{new_username}` already 
exists")
+
+    # Check unique email
+    email = data.get('email')
+    if email:
+        usr = security_manager.find_user(email=email)
+        if usr and usr != user:
+            raise AlreadyExists(detail=f"The email `{email}` already exists")

Review comment:
       In my opinion, since the UI has those fields as required, making them 
required in OpenAPi Document will be more explicit as the API documentation 
would show those fields as required just like the UI shows them. Having it 
implicitly enforced would not look very good from a usage standpoint. WDYT?




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