fix aliased record field

hiku/denormalize/base.py

@@ -111,7 +111,10 @@ def visit_field(self, obj: Field) -> None:
         else:
             # Record type itself does not have custom serialization
             # TODO: support Scalar/Enum types in Record
-            self._res[-1][obj.result_key] = self._data[-1][obj.result_key]
+
+            # if record field is aliased, use index_key as a result-key
+            result_key = obj.result_key if obj.alias is None else obj.index_key
+            self._res[-1][obj.result_key] = self._data[-1][result_key]
 
     def visit_link(self, obj: Link) -> None:
         if isinstance(self._type[-1], (Union, Interface)):

tests/test_endpoint_graphql.py

@@ -12,6 +12,8 @@
 from hiku.graph import Field, Graph, Root
 from hiku.schema import Schema
 from hiku.types import String
+from hiku.types import Record
+from hiku.types import TypeRef
 
 
 @pytest.fixture(name="sync_graph")
@@ -123,3 +125,18 @@ def get_custom_context(ec):
         {"data": {"answer": "52"}},
         {"data": {"__typename": "Query"}},
     ]
+
+
+@pytest.mark.asyncio
+async def test_denormalize_aliased_record_field():
+    async def answer(fields):
+        return [{"answer": "42"} for _ in fields]
+
+    dt = {"Answer": Record[{"answer": String}]}
+    graph = Graph(
+        [Root([Field("question", TypeRef["Answer"], answer)])], data_types=dt
+    )
+
+    schema = Schema(AsyncIOExecutor(), graph)
+    result = await schema.execute("{ question { my_answer: answer } }")
+    assert result.data == {"question": {"my_answer": "42"}}