#34510: sqlmigrate does not follows replaces in squashed migrations
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Reporter: | Owner: nobody
NeodymiumFerBore |
Type: Bug | Status: new
Component: Core | Version: 4.2
(Management commands) | Keywords: squashed migration
Severity: Normal | replaces sqlmigrate command core
Triage Stage: | management
Unreviewed | Has patch: 1
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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The sqlmigrate command does not follow `replaces` in squashed migration,
with original (squashed) migration files deleted. This ticket is roughly
the same than #32205, #33583 and #31318. In #31318, the issue is marked as
solved with commit
[https://github.com/django/django/commit/d88365708c554efe3c786c3be6da1d9de916360f
d883657]. Since then, `MigrationLoader` accepts the argument
`replace_migrations`. However,
[https://github.com/django/django/blob/d88365708c554efe3c786c3be6da1d9de916360f/django/core/management/commands/sqlmigrate.py#L37
the loader instance here] has this option to `False`. I don't see a
command option to set it to `True`.
I tried to set it to `True` manually in 4.1.7, and it successfully showed
SQL queries involved in the migration I wanted to inspect. `sqlmigrate.py`
has not changed between 4.1.7 and 4.2, so I guess it also affects it.
[https://github.com/django/django/blob/4.1.7/django/core/management/commands/sqlmigrate.py#L46
Link: MigrationLoader instance in 4.1.7 L46]
[https://github.com/django/django/blob/4.2/django/core/management/commands/sqlmigrate.py#L46
Link: MigrationLoader instance in 4.2 L46]
[https://github.com/django/django/blob/main/django/core/management/commands/sqlmigrate.py#L46
Link: MigrationLoader instance in main L46]
I see that it always has been like this since commit `d883657`. Now maybe
I don't understand why it works like so. Could you explain why it is set
to `False` with no option to set it to `True`? Is it unreliable?
Thank you.
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Ticket URL: <https://code.djangoproject.com/ticket/34510>
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