mapping property can be a callable

rest_delegated_permissions/permissions.py

@@ -99,7 +99,8 @@ def __init__(self, rest_permissions, *delegated_fields, mapping=None, delegated_
 
         :param rest_permissions:
         :param delegated_fields:
-        :param mapping:
+        :param mapping: either a string (all actions will be mapped to this string), dict or
+                        callable taking a request and view and returning action name
         :param delegated_objects_getter:
         :param allowed_safe_actions:  If set, these actions will be granted initial access for the processing.
                                       Later filtering is then used for estimating if user has permissions.
@@ -119,7 +120,7 @@ def _internal_has_permission(self, request, view, obj):
             if not delegated_obj:
                 continue
             delegated_permissions = self.rest_permissions.permissions_for_model(delegated_obj)
-            delegated_action = self._get_delegated_action(view.action)
+            delegated_action = self._get_delegated_action(request, view)
             delegated_view = DelegatedPermission.DelegatedView(
                 self.rest_permissions, type(delegated_obj), request, delegated_action)
 
@@ -132,8 +133,11 @@ def has_permission(self, request, view):
             return True
         return self._internal_has_permission(request, view, None)
 
-    def _get_delegated_action(self, action):
+    def _get_delegated_action(self, request, view):
+        action = view.action
         if self.mapping:
+            if callable(self.mapping):
+                return self.mapping(request, view)
             if isinstance(self.mapping, str):
                 action = self.mapping
             else:

setup.py

@@ -34,7 +34,7 @@ class InvoiceViewSet(ModelViewSet):
 
 setup(
     name='django-rest-delegated-permissions',
-    version='1.1.3',
+    version='1.1.4',
     packages=[
         'rest_delegated_permissions',
     ],