#23577: Rename operations should rename indexes, constraints, sequences and
triggers named after their former value
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Reporter: Chris Woytowitz | Owner: (none)
Type: Bug | Status: new
Component: Migrations | Version: dev
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Fabian Pottbäcker):
I just ran into a similar Issue when reverting migrations on Postgres,
specifically I have the following condensed and abstracted migration
history:
1. Setup:
1. Create model Author
2. Create model Book (`author = ForeignKey(Author)`)
2. Introduce PenNames
1. Create model PenName
2. Alter `Book.author` to allow null
3. Add `author_new = ForgeignKey(PenName, null=True)` to book
4. RunPython to create PenNames for all authors and set `author_new`
accordingly (including a corresponding reverse operation)
5. Drop `Book.author`
6. Alter `Book.author_new` to prohibit null
7. Rename `Book.author_new` to `Book.author`
3. Remove PenNames (for whatever reason)
1. Some Operation to repopulate `Book.author`
2. Drop column `Book.author`
After successfully applying these migrations, reverting to State 1 will
error when undoing step 2.5, since the index `book_author_id...` was
already created when undoing step 3.2, but it would be called
`book_author_new_id...` when applying these migrations forwards.
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Ticket URL: <https://code.djangoproject.com/ticket/23577#comment:38>
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