What is the purpose of parse_obj's second argument: "update"?

[zmievsa]

First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn't find it.
• I searched the SQLModel documentation, with the integrated search.
• I already searched in Google "How to X in SQLModel" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to SQLModel but to Pydantic.
• I already checked if it is not related to SQLModel but to SQLAlchemy.

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• I commit to help with one of those options 👆

Example Code

SomeModel.parse_obj({"one": 2}, {"three": 4})

Description

SQLModel's parse_obj supports the update argument which is not supported by pydantic's BaseModel. However, I do not see it ever used in docs, github issues, or in source code.

Could someone explain why it was added? What was the actual use case? I understand what it does, but I don't understand why it does it.

Operating System

Linux, Windows, macOS, Other

Operating System Details

No response

SQLModel Version

0.0.8

Python Version

3.11

Additional Context

No response

[antont]

I'm using it in from_orm when get some parameters to create a new object in an API call from a client, but then add more values to the DB type using some logic in my endpoint function.

So am doing this:
dbob = dbtype.from_orm(createob, update=additionalvals)

[DLukeNelson]

See https://sqlmodel.tiangolo.com/tutorial/fastapi/update-extra-data/#create-a-model-object-with-extra-data