diff --git a/api/optimeet/groups/models.py b/api/optimeet/groups/models.py
index 9f4cf66..b594e1b 100644
--- a/api/optimeet/groups/models.py
+++ b/api/optimeet/groups/models.py
@@ -46,6 +46,9 @@ class Preferences(models.Model):
     lon = models.FloatField()
     radius = models.FloatField()
 
+    class Meta:
+        unique_together = [["group_id", "user_id"]]
+
 class Votes(models.Model):
     rec_id = models.ForeignKey(Recommendations, on_delete=models.DO_NOTHING)
     group_id = models.ForeignKey(Group, on_delete=models.DO_NOTHING, default="")
diff --git a/api/optimeet/groups/views.py b/api/optimeet/groups/views.py
index 6848c47..4520cdb 100644
--- a/api/optimeet/groups/views.py
+++ b/api/optimeet/groups/views.py
@@ -21,8 +21,10 @@ def groups(request):
     serializer = serializers.GroupSerializer(data = request.data)
     
     if serializer.is_valid():
-        serializer.save()
-        
+        group = serializer.save()
+        usergroup = models.UserGroup(user_id=group.host_id, group_id=group)
+        usergroup.save()
+
         return Response(serializer.data, status=status.HTTP_201_CREATED)
             
     return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)