fix(migration): fix migration when another model with a different id exists

[croissong]

fixes #159

[vincent-herlemont]

The CI failed due to a token issue, audit in progress here: #161

[vincent-herlemont]

The CI problem is not related to the code, so it's fine by me.

@croissong You can mark the issue as ready for review if you want me to merge it.

[croissong]

@vincent-herlemont thanks!
I added two slightly unrelated commits just now:

• tried to improve the "Impossible to migrate the table ..." error message, because it confused me a bit when I encountered it, and I think it should be made clear that the issue is caused by multiple old tables with data.
  I hope the error is at least a little bit better now 😅

• additional tests for migrating with multiple model versions, to make sure the migrate logic still works after the change.
  But I just noticed that there's already test_migrate_v3 which covers multiple model versions, so let me know if I should change/remove my tests

[vincent-herlemont]

@croissong Thank you for improving the error message and adding the tests!

But I just noticed that there's already test_migrate_v3 which covers multiple model versions, so let me know if I should change/remove my tests

Yes, sorry for the naming of some of my tests like test_migrate_v3, which are not very descriptive. I should pay more attention to that.

This will be taken into account for Release 0.7.0. However, I am currently doing a major refactor, so it should be ready in one or two weeks.

[vincent-herlemont]

🎉 This PR is included in version 0.7.0 🎉

The release is available on:

• 0.7.0
• GitHub release

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