added guardian as optional requirement, stubbed out object-level permission class

1 files changed, 6 insertions, 1 deletions

diff --git a/rest_framework/permissions.py b/rest_framework/permissions.py
index 1036663e..6d213ba1 100644
--- a/rest_framework/permissions.py
+++ b/rest_framework/permissions.py
@@ -7,7 +7,7 @@ import warnings
 
 SAFE_METHODS = ['GET', 'HEAD', 'OPTIONS']
 
-from rest_framework.compat import oauth2_provider_scope, oauth2_constants
+from rest_framework.compat import oauth2_provider_scope, oauth2_constants, guardian
 
 
 class BasePermission(object):
@@ -151,6 +151,11 @@ class DjangoModelPermissionsOrAnonReadOnly(DjangoModelPermissions):
     authenticated_users_only = False
 
 
+class DjangoObjectLevelModelPermissions(DjangoModelPermissions):
+    def __init__(self):
+        assert guardian, 'Using DjangoObjectLevelModelPermissions, but guardian is not installed'
+
+
 class TokenHasReadWriteScope(BasePermission):
     """
     The request is authenticated as a user and the token used has the right scope