From f5aed059bfad48b205e2bb35c5f9d2d1baed3342 Mon Sep 17 00:00:00 2001
From: Jan-Jelle Kester <janjelle@jjkester.nl>
Date: Wed, 11 Dec 2013 17:14:07 +0100
Subject: [PATCH] Add changes_dict and changes_str utility methods to LogEntry
 model

---
 src/auditlog/models.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/auditlog/models.py b/src/auditlog/models.py
index 7e3e4a1..f984b67 100644
--- a/src/auditlog/models.py
+++ b/src/auditlog/models.py
@@ -99,6 +99,29 @@ class LogEntry(models.Model):
             fstring = _("Logged {repr:s}")
 
         return fstring.format(repr=self.object_repr)
+
+    @property
+    def changes_dict(self):
+        try:
+            return json.loads(self.changes)
+        except ValueError:
+            return {}
+
+    @property
+    def changes_str(self, colon=': ', arrow=u' \u2192 ', separator='; '):
+        substrings = []
+
+        for field, values in self.changes_dict.iteritems():
+            substring = u'{fieldname:s}{colon:s}{old:s}{arrow:s}{new:s}'.format(
+                fieldname=field,
+                colon=colon,
+                old=values[0],
+                arrow=arrow,
+                new=values[1],
+            )
+            substrings.append(substring)
+
+        return separator.join(substrings)
         
 
 class AuditlogHistoryField(generic.GenericRelation):