chekc for past ids

fet2020/tasks/migrations/0002_alter_task_options_task_slug_task_slug_id_and_more.py

@@ -9,15 +9,21 @@ from django.db import migrations, models
 import django.db.models.deletion
 import django.db.models.expressions
 from django.utils.text import slugify
-
+import time
 logger = logging.getLogger(__name__)
 
 
 def forwards_func(apps, schema_editor):
     Tasks = apps.get_model("tasks", "Task")
+    past_ids=[]
     for elem in Tasks.objects.all():
-        elem.slug_id = str(uuid.uuid4())#fet2020.utils.create_random_id()
+        for i in xrange(4) 
+           sid = fet2020.utils.create_random_id()
+            if not sid in past_ids: break    
+            time.sleep(0.1)
+        elem.slug_id = sid
         elem.slug = elem.slug_id + "-" + slugify(elem.title)
+        past_ids.append(sid)
         
         logger.info(f"Task: {elem}")
         logger.info(f"Slug ID: {elem.slug_id}")