From 771efc29205b7b200f13404bbf5bf96d984338fa Mon Sep 17 00:00:00 2001
From: Étienne Loks <etienne.loks@iggdrasil.net>
Date: Sat, 12 Aug 2017 12:54:13 +0200
Subject: DocumentTemplate: add slug, manage natural key. Utils: create_slug
 function

---
 ishtar_common/utils.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'ishtar_common/utils.py')

diff --git a/ishtar_common/utils.py b/ishtar_common/utils.py
index 19ff16394..9eda2d22f 100644
--- a/ishtar_common/utils.py
+++ b/ishtar_common/utils.py
@@ -241,3 +241,17 @@ def post_save_point(sender, **kwargs):
         instance.skip_history_when_saving = True
         instance.save()
     return
+
+
+def create_slug(model, name, slug_attr='slug', max_length=100):
+    base_slug = slugify(name)
+    slug = base_slug[:max_length]
+    final_slug = None
+    idx = 1
+    while not final_slug:
+        if slug and not model.objects.filter(**{slug_attr:slug}).exists():
+            final_slug = slug
+            break
+        slug = base_slug[:(max_length - 1 - len(str(idx)))] + "-" + str(idx)
+        idx += 1
+    return final_slug
-- 
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