Detect new objects in a UUIDField-compatible way

Author: j4mie

django_dbq/models.py

@@ -58,7 +58,9 @@ class Meta:
     objects = JobManager()
 
     def save(self, *args, **kwargs):
-        if not self.pk:
+        is_new = not Job.objects.filter(pk=self.pk).exists()
+
+        if is_new:
             self.next_task = get_next_task_name(self.name)
             self.workspace = self.workspace or {}