✨ Add support in jsonable_encoder for include and exclude with dataclasses

fastapi/encoders.py

@@ -71,11 +71,14 @@ def jsonable_encoder(
             sqlalchemy_safe=sqlalchemy_safe,
         )
     if dataclasses.is_dataclass(obj):
-        obj_dict = dataclasses.asdict(obj)
         return jsonable_encoder(
-            obj_dict,
-            exclude_none=exclude_none,
+            dataclasses.asdict(obj),
+            include=include,
+            exclude=exclude,
+            by_alias=by_alias,
+            exclude_unset=exclude_unset,
             exclude_defaults=exclude_defaults,
+            exclude_none=exclude_none,
             custom_encoder=custom_encoder,
             sqlalchemy_safe=sqlalchemy_safe,
         )

tests/test_jsonable_encoder.py

@@ -1,3 +1,4 @@
+from dataclasses import dataclass
 from datetime import datetime, timezone
 from enum import Enum
 from pathlib import PurePath, PurePosixPath, PureWindowsPath
@@ -19,6 +20,12 @@ def __init__(self, owner: Person, name: str):
         self.name = name
 
 
+@dataclass
+class Item:
+    name: str
+    count: int
+
+
 class DictablePerson(Person):
     def __iter__(self):
         return ((k, v) for k, v in self.__dict__.items())
@@ -131,6 +138,15 @@ def test_encode_dictable():
     }
 
 
+def test_encode_dataclass():
+    item = Item(name="foo", count=100)
+    assert jsonable_encoder(item) == {"name": "foo", "count": 100}
+    assert jsonable_encoder(item, include={"name"}) == {"name": "foo"}
+    assert jsonable_encoder(item, exclude={"count"}) == {"name": "foo"}
+    assert jsonable_encoder(item, include={}) == {}
+    assert jsonable_encoder(item, exclude={}) == {"name": "foo", "count": 100}
+
+
 def test_encode_unsupported():
     unserializable = Unserializable()
     with pytest.raises(ValueError):