sea-orm-cli Support a flag for per-field model attributes

[andres-movl]

Started as a discussion on Discord

Motivation

We are using ActixAdmin which also uses SeaORM. However ActixAdmin requires attributes on the model structs on a field level to specify which fields to show in the admin. The issue is that if we have any model changes, sea-orm-cli overrides everything so we need a new flag similar to --model-extra-derives but which allows the user to add attributes on a per field granularity.

Proposed Solutions

A solution would be to add a new flag to support "model-field-extra-derives".

Current Workarounds

None, just re-adding field level attributes manually every time there's a change to the models.

[BadMachine]

Any progress?

[Expurple]

re-adding field level attributes manually every time there's a change to the models.

As a workaround for now, you can automate this step:

1. Use diff / git diff to save a .patch file with the diff that adds the attributes. Commit that file to the repo.
2. After generating models, invoke the patch utility to apply that diff and fix the file.

I recently had to do this because of this bug in model generation: #2409. I already had a wrapper script for code generation, to call rustfmt after sea-orm-cli.