Migration strategy for proxy model permissions to use their own content type

[Arthur Rio]

Hi all,

I have been working on a 9 years old ticket that I'd like to close once and for all. The outstanding question is about the migration path to choose in order to update existing proxy model permissions. I have explained three different approaches I can think of in the pull request: https://github.com/django/django/pull/10381#issuecomment-435534644. 

I have implemented the first option and wrote the release notes explaining what to expect for users upgrading: https://github.com/django/django/pull/10381/files#diff-1f22a5c1d6164c6de8defb36f3829138.

Carlton, who has been the main reviewer, suggested to contact the mailing list for further review in order to catch any red flag and make sure we have general consensus on the chosen approach. 

Regards.

Arthur

[Aymeric Augustin]

Hello Arthur,

I agree that option 1 is the way to go.

It would be nice to make the migration reversible. If someone upgrades to Django 2.2.x, migrates the database, and later discovers a blocking issue, they should have the option to migrate backwards and downgrade to 2.1.y.

Best regards,

-- 

Aymeric.

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[Arthur Rio]

Thank you for your feedback Aymeric,

I have added the backward migration method + tests per your suggestion: https://github.com/django/django/pull/10381/commits/d5c4a4b08ccee9239e5117df4c788a5a7a2f60a9

Regards

—

Arthur

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