From e353a01a9a74bc624724e6e507b47e7697afe910 Mon Sep 17 00:00:00 2001
From: Keryn Knight <keryn@kerynknight.com>
Date: Tue, 1 Jul 2014 14:37:41 +0100
Subject: [PATCH] Implemented ability to change modified fields manually.

---
 model_utils/fields.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/model_utils/fields.py b/model_utils/fields.py
index 8728d56..7fe1c83 100644
--- a/model_utils/fields.py
+++ b/model_utils/fields.py
@@ -30,8 +30,14 @@ class AutoLastModifiedField(AutoCreatedField):
 
     """
     def pre_save(self, model_instance, add):
-        value = now()
-        setattr(model_instance, self.attname, value)
+        if add and hasattr(model_instance, self.attname):
+            # when creating an instance and the modified date is set
+            # don't change the value, assume the developer wants that
+            # control.
+            value = getattr(model_instance, self.attname)
+        else:
+            value = now()
+            setattr(model_instance, self.attname, value)
         return value