fix: Fix loading namespace packages from JSON

Issue-407: #407
PR-413: #413

Author: johnslavik

src/griffe/_internal/encoders.py

@@ -192,9 +192,12 @@ def _attach_parent_to_exprs(obj: Class | Function | Attribute | TypeAlias, paren
 
 
 def _load_module(obj_dict: dict[str, Any]) -> Module:
+    filepath = obj_dict.get("filepath")
+    if filepath is not None:
+        filepath = [*map(Path, filepath)] if isinstance(filepath, list) else Path(filepath)
     module = Module(
         name=obj_dict["name"],
-        filepath=Path(obj_dict["filepath"]) if "filepath" in obj_dict else None,
+        filepath=filepath,
         docstring=_load_docstring(obj_dict),
         runtime=obj_dict.get("runtime", True),
         analysis=obj_dict.get("analysis"),

tests/test_encoders.py

@@ -8,7 +8,17 @@
 import pytest
 from jsonschema import ValidationError, validate
 
-from griffe import Attribute, Class, Function, GriffeLoader, Kind, Module, Object, temporary_visited_module
+from griffe import (
+    Attribute,
+    Class,
+    Function,
+    GriffeLoader,
+    Kind,
+    Module,
+    Object,
+    temporary_inspected_package,
+    temporary_visited_module,
+)
 
 
 def test_minimal_data_is_enough() -> None:
@@ -35,6 +45,18 @@ def test_minimal_data_is_enough() -> None:
         Function.from_json(minimal)
 
 
+def test_namespace_packages() -> None:
+    """Test support for namespace packages.
+
+    Namespace packages are a bit special as they have no `__init__.py` file.
+    """
+    with temporary_inspected_package("namespace_package", init=False) as package:
+        dump_options = {"indent": 2, "sort_keys": True}
+        as_json = package.as_json(full=True, **dump_options)
+        from_json = Object.from_json(as_json)
+        assert from_json.as_json(full=True, **dump_options) == as_json
+
+
 @pytest.mark.parametrize(
     "symbol",
     [