From b7aa4b36d0e30971eb362c811c87545dd4d33aa8 Mon Sep 17 00:00:00 2001
From: Lance Edgar <ledgar@sacfoodcoop.com>
Date: Thu, 15 Jan 2015 01:40:00 -0600
Subject: [PATCH] Add unique username check when creating users.

---
 tailbone/views/users.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tailbone/views/users.py b/tailbone/views/users.py
index 52683c99..69f5e4cd 100644
--- a/tailbone/views/users.py
+++ b/tailbone/views/users.py
@@ -27,7 +27,7 @@ User Views
 
 from __future__ import unicode_literals
 
-from formalchemy import Field
+from formalchemy import Field, ValidationError
 from formalchemy.fields import SelectFieldRenderer
 
 from edbob.pyramid.views import users
@@ -168,6 +168,12 @@ class UserCrud(CrudView):
                 fs.active,
                 ])
 
+        if self.creating:
+            def valid_username(value, field):
+                if Session.query(User).filter_by(username=value).count():
+                    raise ValidationError("Username must be unique.")
+            fs.username.set(validate=valid_username)
+
         if self.readonly:
             del fs.password
             del fs.confirm_password