fix: drop some type fixme (#20344)

api/core/model_runtime/utils/encoders.py

@@ -129,17 +129,18 @@ def jsonable_encoder(
             sqlalchemy_safe=sqlalchemy_safe,
         )
     if dataclasses.is_dataclass(obj):
-        # FIXME: mypy error, try to fix it instead of using type: ignore
-        obj_dict = dataclasses.asdict(obj)  # type: ignore
-        return jsonable_encoder(
-            obj_dict,
-            by_alias=by_alias,
-            exclude_unset=exclude_unset,
-            exclude_defaults=exclude_defaults,
-            exclude_none=exclude_none,
-            custom_encoder=custom_encoder,
-            sqlalchemy_safe=sqlalchemy_safe,
-        )
+        # Ensure obj is a dataclass instance, not a dataclass type
+        if not isinstance(obj, type):
+            obj_dict = dataclasses.asdict(obj)
+            return jsonable_encoder(
+                obj_dict,
+                by_alias=by_alias,
+                exclude_unset=exclude_unset,
+                exclude_defaults=exclude_defaults,
+                exclude_none=exclude_none,
+                custom_encoder=custom_encoder,
+                sqlalchemy_safe=sqlalchemy_safe,
+            )
     if isinstance(obj, Enum):
         return obj.value
     if isinstance(obj, PurePath):