Allow Schema model_config.extra = "allow"

[soccer99]

Allow setting the model_config key extra="allow"

# schemas.py

class ExtraAllowedSchema(Schema):
    name: str

    class Config(Schema.Config):
        extra = "allow"

# views.py
@api.post("/extra")
def extra_params(request, payload: ExtraAllowedSchema):
    """
    Test that a Schema with model_config.extra = "allow" will allow keys not defined in schema
    """
    return payload

A request with extra keys will be honored and returned

# Request
POST: /extra
JSON payload {"name": "my name", "age": 100}
Response
{"name": "my name", "age": 100}

Also works on response schemas if you return a dictionary with extra keys outside your OutSchema.

Fixes issue: #1087

[p-baum]

This change causes extra fields to be included in the main parsed data - clearly not what we want. We need the extra data stored in the model_extra attribute.

[Vulwsztyn]

This change causes extra fields to be included in the main parsed data - clearly not what we want.

Not really. It's ok.

[soccer99]

Including the extra fields at the top level is the default pydantic behavior when using extra = "allow". I suppose we could only expose those extra fields in an extra param on the view function if thats what is decided.

[Vulwsztyn]

@vitalik Could you take a look?

I'm sorry if it is not ok that I ping you, but I'm interested in this feature

[vitalik]

Still thinking about it (need more testing on like how it will behave wit schema have resolvers or handles objects outputs instead of dicts...)