Remove side effect in jsonable_encoder to fix failing test

3 years ago · 76cc8d7c24
1 changed files with 1 additions and 1 deletions
--- a/fastapi/encoders.py
+++ b/fastapi/encoders.py
@ -52,7 +52,7 @@ def jsonable_encoder(
    if isinstance(obj, BaseModel):
        encoder = getattr(obj.__config__, "json_encoders", {})
        if custom_encoder:
-            encoder.update(custom_encoder)
+            encoder = {**encoder, **custom_encoder}
        obj_dict = obj.dict(
            include=include,
            exclude=exclude,