core/tools: serialize domain objects on PersistentDataView commit

tests/test_tools/test_view.py

@@ -29,7 +29,7 @@ async def test_view_rollback_on_error() -> None:
     assert await store.load() == {"keep": 1}
 
 
-async def test_typed_todo_stack() -> None:
+async def test_typed_todo_stack_commits_raw() -> None:
     store = MemoryViewStore({})
     root: PersistentDataView[dict[str, object]] = PersistentDataView(store, bound_type=dict)
     async with root as data:
@@ -38,7 +38,24 @@ async def test_typed_todo_stack() -> None:
         assert todo.depth == 1
     loaded = await store.load()
     assert isinstance(loaded, dict)
-    assert isinstance(loaded.get("todo"), TodoStack)
+    raw_todo = loaded.get("todo")
+    assert isinstance(raw_todo, dict)
+    assert "groups" in raw_todo
+    restored = TodoStack.from_raw(raw_todo)
+    assert restored.depth == 1
+    assert [i.title for i in restored.groups[0].items] == ["A", "B"]
+
+
+async def test_typed_todo_stack_roundtrip_from_raw() -> None:
+    store = MemoryViewStore({"todo": {"groups": [], "next_id": 1}})
+    root: PersistentDataView[dict[str, object]] = PersistentDataView(store, bound_type=dict)
+    async with root as data:
+        todo = data["todo"].typed(TodoStack)
+        _ = todo.push_group(["only"])
+    loaded = await store.load()
+    assert isinstance(loaded, dict)
+    again = TodoStack.from_raw(loaded["todo"])
+    assert [i.title for i in again.all_items()] == ["only"]
 
 
 async def test_mutate_outside_txn_errors() -> None: