fix: load generic dict scalar fields

Author: thearchitector

indico/types/base.py

@@ -1,7 +1,7 @@
 import inspect
 import json
 from datetime import datetime
-from typing import TYPE_CHECKING, Any, List, cast
+from typing import TYPE_CHECKING, Any, List, cast, get_origin
 
 from indico.types.utils import cc_to_snake
 
@@ -38,6 +38,7 @@ def valid_type(v: "Any") -> bool:
     return (
         (inspect.isclass(v) and issubclass(v, BaseType))
         or v in [str, int, float, bool, JSONType, datetime]
+        or get_origin(v) is dict
         or valid_type(list_subtype(v))
     )
 

tests/unit/types/test_base_type.py

@@ -1,5 +1,5 @@
 from datetime import datetime
-from typing import List
+from typing import Dict, List
 
 from indico.types.base import BaseType, JSONType
 
@@ -97,3 +97,12 @@ class A(BaseType):
     x = A(**{"createdAt": "1590169591.582852"})
 
     assert x.created_at == datetime.fromtimestamp(1590169591.582852)
+
+
+def test_generic_dict_field():
+    class A(BaseType):
+        meta: Dict[str, str]
+
+    x = A(meta={"foo": "bar"})
+
+    assert x.meta == {"foo": "bar"}