From f09b1593ca7e1b4b920b981c8117841fcfd08ad3 Mon Sep 17 00:00:00 2001
From: Nik Nyby <nnyby@columbia.edu>
Date: Wed, 27 Jan 2016 16:46:31 -0500
Subject: [PATCH] Add error messaging when user tries to create a duplicate
 hierarchy

Helps address issue #120
---
 pagetree/forms.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/pagetree/forms.py b/pagetree/forms.py
index 0681a072..7ed1fbb4 100644
--- a/pagetree/forms.py
+++ b/pagetree/forms.py
@@ -8,6 +8,21 @@ class Meta:
         model = Hierarchy
         fields = ['name', 'base_url']
 
+    def clean(self):
+        cleaned_data = super(CloneHierarchyForm, self).clean()
+        name = cleaned_data.get('name')
+        base_url = cleaned_data.get('base_url')
+
+        if Hierarchy.objects.filter(name=name).count() > 0:
+            raise forms.ValidationError(
+                'There\'s already a hierarchy with the name: {}'.format(
+                    name))
+
+        if Hierarchy.objects.filter(base_url=base_url).count() > 0:
+            raise forms.ValidationError(
+                'There\'s already a hierarchy with the base_url: {}'.format(
+                    base_url))
+
 
 MoveSectionForm = movenodeform_factory(
     Section,