🐛 Recurse into dataclass when encoding

fastapi/encoders.py

@@ -63,7 +63,7 @@ def jsonable_encoder(
             sqlalchemy_safe=sqlalchemy_safe,
         )
     if dataclasses.is_dataclass(obj):
-        return dataclasses.asdict(obj)
+        return jsonable_encoder(dataclasses.asdict(obj))
     if isinstance(obj, Enum):
         return obj.value
     if isinstance(obj, PurePath):

tests/test_serialize_response_dataclass.py

@@ -1,8 +1,9 @@
+from dataclasses import dataclass
+from datetime import date
 from typing import List, Optional
 
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
-from pydantic.dataclasses import dataclass
 
 app = FastAPI()
 
@@ -14,6 +15,11 @@ class Item:
     owner_ids: Optional[List[int]] = None
 
 
+@dataclass
+class EncodingItem:
+    date: date
+
+
 @app.get("/items/valid", response_model=Item)
 def get_valid():
     return {"name": "valid", "price": 1.0}
@@ -29,6 +35,11 @@ def get_coerce():
     return {"name": "coerce", "price": "1.0"}
 
 
+@app.get("/items/encoding", response_model=EncodingItem)
+def get_encoding():
+    return {"date": date(2022, 1, 20)}
+
+
 @app.get("/items/validlist", response_model=List[Item])
 def get_validlist():
     return [
@@ -82,6 +93,12 @@ def test_coerce():
     assert response.json() == {"name": "coerce", "price": 1.0, "owner_ids": None}
 
 
+def test_encoding():
+    response = client.get("/items/encoding")
+    response.raise_for_status()
+    assert response.json() == {"date": "2022-01-20"}
+
+
 def test_validlist():
     response = client.get("/items/validlist")
     response.raise_for_status()