diff --git a/apps/rating/migrations/0002_auto_20191004_0928.py b/apps/rating/migrations/0002_auto_20191004_0928.py
new file mode 100644
index 00000000..a172c6f1
--- /dev/null
+++ b/apps/rating/migrations/0002_auto_20191004_0928.py
@@ -0,0 +1,22 @@
+# Generated by Django 2.2.4 on 2019-10-04 09:28
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        ('rating', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='rating',
+            options={},
+        ),
+        migrations.AlterUniqueTogether(
+            name='rating',
+            unique_together={('ip', 'object_id', 'content_type')},
+        ),
+    ]
diff --git a/apps/rating/models.py b/apps/rating/models.py
index 61e4378d..e1dcec86 100644
--- a/apps/rating/models.py
+++ b/apps/rating/models.py
@@ -10,6 +10,9 @@ class Rating(models.Model):
     content_object = GenericForeignKey('content_type', 'object_id')
     ip = models.GenericIPAddressField(verbose_name=_('ip'))
 
+    class Meta:
+        unique_together = ('ip', 'object_id', 'content_type')
+
     @property
     def name(self):
         # Check if Generic obj has name or title
diff --git a/apps/rating/tasks.py b/apps/rating/tasks.py
index 0e176910..5c2653a0 100644
--- a/apps/rating/tasks.py
+++ b/apps/rating/tasks.py
@@ -1,5 +1,4 @@
-from datetime import timedelta
-from celery import task
+from celery import shared_task
 from rating.models import Rating
 from django.contrib.contenttypes.models import ContentType
 
@@ -10,13 +9,10 @@ def add_rating(remote_addr, pk, model, app_label):
     )
 
 
-@task
+@shared_task
 def add(remote_addr, pk, model, app_label):
-    rating = Rating()
-    rating.ip = remote_addr
-    rating.object_id = pk
-    rating.content_type = ContentType.objects.get(app_label=app_label, model=model)
-    rating.save()
-
+    content_type = ContentType.objects.get(app_label=app_label, model=model)
+    Rating.objects.get_or_create(
+            ip=remote_addr, object_id=pk, content_type=content_type)