Make exclude_columns work with nested for create_pydantic_model

[dantownsend]

We have two great new features for create_pydantic_model (exclude_columns and nested).

I'd like to make sure that they work together. For example:

create_pydantic_model(Band, nested=True, exclude_columns=(Band.manager.id,))

In which case the Manager sub model would omit it's id column.

[sinisaos]

@dantownsend Just for info. Excluding individual column from the sub model doesn't work ValueError raised from here because Band.manager.id is invalid Band table column. We can only exclude the entire sub model like this

create_pydantic_model(Band, nested=True, exclude_columns=(Band.manager,))

[dantownsend]

@sinisaos Yeah, it's unfortunate. Not an urgent issue, but would be nice to have.

[sinisaos]

@dantownsend Can you please close this issue because it's done with latest changes.

[dantownsend]

@sinisaos Yep, good point. Fixed by #98