From 87f437380c1dd8f420437cddc028c0f3174ee1c9 Mon Sep 17 00:00:00 2001
From: Matthias Baumgartner <dev@igsor.net>
Date: Thu, 2 Mar 2023 12:19:58 +0100
Subject: Node getters in bsfs.Graph:

* Empty nodes instance (Graph.empty)
* Order-preserving get query (Graph.sorted)
* Collect common code in private Graph.__get
* Empty query in Graph.get
* Empty query in Graph.resolve.Filter
* Empty query in AC: filter_read
---
 bsfs/graph/resolve.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'bsfs/graph/resolve.py')

diff --git a/bsfs/graph/resolve.py b/bsfs/graph/resolve.py
index 4677401..b3ab001 100644
--- a/bsfs/graph/resolve.py
+++ b/bsfs/graph/resolve.py
@@ -40,8 +40,13 @@ class Filter():
     def __init__(self, schema):
         self.schema = schema
 
-    def __call__(self, root_type: bsc.Node, node: ast.filter.FilterExpression):
-        # FIXME: node can be None!
+    def __call__(
+            self,
+            root_type: bsc.Node,
+            node: typing.Optional[ast.filter.FilterExpression],
+            ):
+        if node is None:
+            return None
         return self._parse_filter_expression(root_type, node)
 
     def _parse_filter_expression(
-- 
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