Mark primary key columns as unique in sea-orm-codegen

[SZenglein]

PR Info

This is a relatively simple change where sea-orm-cli did not mark primary key columns as unique, resulting in a has_many relation where a has_one would be correct. Issue #1884 offers a complete example where the problem occurs.

I only tested this for SQLite, but it should be pretty universal.

Maybe related: #1629
Fixes: #1884

New Features

None

Bug Fixes

sea-orm-cli no longer incorrectly assumes primary key columns as non-unique.

Breaking Changes

Code generation will be different in some cases (has_many replaced by has_one).

[billy1624]

Hey @SZenglein, thanks for the PR. Sorry, I don't think this solve the root cause of the issue. I just made a PR, #2254, would you like to take a look and try it?

Install sea-orm-cli and try it on your local machine:

cargo install sea-orm-cli --force --git https://github.com/SeaQL/sea-orm --branch cli-gen-has-one-relation