Move uuid setting from __init__ to model

apps/installation/__init__.py

@@ -1,7 +1,5 @@
 from __future__ import absolute_import
 
-import uuid
-
 from south.signals import post_migrate
 
 from project_tools.api import register_tool
@@ -16,10 +14,10 @@ from .models import Installation
 
 @receiver(post_migrate, dispatch_uid='trigger_first_time')
 def trigger_first_time(sender, **kwargs):
-    details = Installation.objects.get()
-    details.is_first_run = True
-    details.uuid = unicode(uuid.uuid4())
-    details.save()
+    if kwargs['app'] == 'installation':
+        details = Installation.objects.get()
+        details.is_first_run = True
+        details.save()
 
 
 def check_first_run():

apps/installation/models.py

@@ -1,5 +1,6 @@
 import sys
 import platform
+import uuid
 
 import pbs
 import psutil
@@ -43,7 +44,7 @@ class Installation(Singleton):
     _properties = SortedDict()
 
     is_first_run = models.BooleanField(default=False)
-    uuid = models.CharField(max_length=48, blank=True)
+    uuid = models.CharField(max_length=48, blank=True, default=lambda: unicode(uuid.uuid4()))
 
     def add_property(self, property_instance):
         self._properties[property_instance.name] = property_instance