Cannot inspect migrations that replace squashed migrations with sqlmigrate

[Giovanni Allegri]

Commit ​https://github.com/django/django/commit/d88365708c554efe3c786c3be6da1d9de916360f forces MigrationLoader with replace_migrations=False. This is fine to inspect squashed migrations, as requested in https://code.djangoproject.com/ticket/31318.

However, in case the squashed migrations remove a model or a field, the command breaks when it reaches the migration that replaces the squashed migrations. since this will try to modify a model that was already removed (by the squashed migrations).

I propose to make the replace_migrations controllable with a parameter to sqlmigrate. If not set the option will be False (as it is now by default). The following command would make sqlmigrate replace squashed migrations:

django-admin sqlmigrate --replace-migrations ...

[Mariusz Felisiak]

However, in case the squashed migrations remove a model or a field, the command breaks when it reaches the migration that replaces the squashed migrations. since this will try to modify a model that was already removed (by the squashed migrations).

I cannot reproduce any crash in such a scenario. Please reopen the ticket if you can debug your issue and provide a sample project that reproduces the issue.