Pydantic excluded fields are being exported to schema and fail serialization

[michal-rogala]

Hello!

When using pydantic (AvroBaseModel) - if a field is marked as excluded, it's still being exported to schema and serialization raises an error. Pydantic internal fields (beginning with underscore) are being ignored but those marked as excluded are not.

Current behavior:

from dataclasses_avroschema.avrodantic import AvroBaseModel
from pydantic import Field

class Message(AvroBaseModel):
    internal_field: str = Field(exclude=True)
    public_field: str

print(Message.avro_schema())

this results in schema:
{"type": "record", "name": "Message", "fields": [{"name": "internal_field", "type": "string"}, {"name": "public_field", "type": "string"}]}

Object serialization:

m = Message(internal_field="internal", public_field="public")
print(m.serialize(serialization_type="avro-json"))

raises an error:

fastavro/_write_py.py", line 252, in write_record
    raise ValueError(f"no value and no default for {name}")
ValueError: no value and no default for internal_field

Which of course make sense as this value is not provided by pydantic - because it's excluded.

Expected behavior
Excluded message is not reflected in schema and serialization.

[marcosschroh]

Hi @michal-rogala

Thanks for reporting the bug. I will try to solve it asap

[michal-rogala]

perfect, thank you :)

[marcosschroh]

I have released a new version with the fix. Here is the documentation

[michal-rogala]

thank you! :)

[joaoe]

This fix introduced a regression
#324