#33319: Query.change_aliases raises an AssertionError
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Reporter: Ömer Faruk Abacı | Owner: Vishal
| Pandey
Type: Bug | Status: assigned
Component: Database layer | Version: 3.2
(models, ORM) |
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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Changes (by Simon Charette):
* cc: Simon Charette (added)
Comment:
Vishal Pandey, if you're looking for pointers on how to resolve the issue
I think I have a pretty good understanding of the problem.
The root cause is that both queries happen to share the same
`alias_prefix`; the letter used generate aliases when the same table is
referenced more than once in a query.
We already have a method that does all of the heavy lifting to prevent
these collisions that the ORM uses when subqueries are involved which is
`Query.bump_prefix` but it's not entirely applicable here. I think the
best way forward here is to change the `alias_prefix` of the `rhs` and
change its alias accordingly so it doesn't conflict before proceeding with
the creation of the `change_map`.
--
Ticket URL: <https://code.djangoproject.com/ticket/33319#comment:4>
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