__fields_set__ incorrectly set unless using the validate class method

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• I already checked if it is not related to SQLModel but to SQLAlchemy.

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Example Code

from sqlmodel import SQLModel
from typing import Optional
class HeroUpdate(SQLModel):
    name: Optional[str] = None
    secret_name: Optional[str] = None
    age: Optional[int] = None
hero = HeroUpdate(age=42)
print(hero.dict(exclude_unset=True))
# output = {'name': None, 'secret_name': None, 'age': 42}

Description

*Create a HeroUpdate model *Create a HeroUpdate instance with unset fields *Use the .dict attribute with the unset_fields parameter *unset_fields show up as None rather than not being included in the dictionary *works fine with Pydantic BaseModel instances

Operating System

macOS

Operating System Details

No response

SQLModel Version

‘0.0.4’

Python Version

3.9.0

Additional Context

If it is run as: hero = HeroUpdate.validate({‘age’:42}) the _fields_set_ are correctly set and it works

[tiangolo]

This was solved by @statt8900 in https://github.com/tiangolo/sqlmodel/pull/117, it will be available in SQLModel 0.0.7, released in the next hours. 🎉

[Maffels]

I have the same problem in my project during development on windows. (SQLModel 0.0.4)

Currently, a workaround might be using the original pydantic.BaseModel as the base model for specific update models allows for the use of exclude_unset once more. Since update models specifically are usually light on inheritance, it’s a relatively painless change until the behaviour in sqlmodel.SQLModel is fixed.