refactor code

Author: kelvin-muchiri

onadata/libs/serializers/project_serializer.py

@@ -9,6 +9,7 @@
 from django.db.utils import IntegrityError
 from django.utils.translation import gettext as _
 
+from guardian.shortcuts import get_perms
 from rest_framework import serializers
 from six import itervalues
 
@@ -367,10 +368,7 @@ def get_current_user_role(self, obj):
         if self.context["request"].user.is_anonymous:
             return None
 
-        request_user = self.context["request"].user
-        perms = obj.projectuserobjectpermission_set.filter(
-            user=request_user
-        ).values_list("permission__codename", flat=True)
+        perms = get_perms(self.context["request"].user, obj)
 
         return get_role(perms, obj)