2 files changed, 8 insertions, 0 deletions
diff --git a/bsfs/graph/ac/base.py b/bsfs/graph/ac/base.py
index 0703e2e..79b09e5 100644
--- a/bsfs/graph/ac/base.py
+++ b/bsfs/graph/ac/base.py
@@ -72,4 +72,8 @@ class AccessControlBase(abc.ABC):
     def filter_read(self, node_type: schema.Node, query: ast.filter.FilterExpression) -> ast.filter.FilterExpression:
         """Re-write a filter *query* to get (i.e., read) *node_type* nodes."""
 
+    @abc.abstractmethod
+    def fetch_read(self, node_type: schema.Node, query: ast.fetch.FetchExpression) -> ast.fetch.FetchExpression:
+        """Re-write a fetch *query* to get (i.e, read) values for *node_type* nodes."""
+
 ## EOF ##
diff --git a/bsfs/graph/ac/null.py b/bsfs/graph/ac/null.py
index 12b4e87..6a923a5 100644
--- a/bsfs/graph/ac/null.py
+++ b/bsfs/graph/ac/null.py
@@ -54,4 +54,8 @@ class NullAC(base.AccessControlBase):
         """Re-write a filter *query* to get (i.e., read) *node_type* nodes."""
         return query
 
+    def fetch_read(self, node_type: schema.Node, query: ast.fetch.FetchExpression) -> ast.fetch.FetchExpression:
+        """Re-write a fetch *query* to get (i.e, read) values for *node_type* nodes."""
+        return query
+
 ## EOF ##