#23410: Backward migrations change overall state rather than reverting single
migration
-----------------------------+--------------------------------------
Reporter: Markush2010 | Owner: nobody
Type: Bug | Status: closed
Component: Migrations | Version: 1.7
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage: Unreviewed
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 andrewgodwin):
* status: new => closed
* resolution: => invalid
* severity: Release blocker => Normal
Comment:
The test is exactly correct; the contract is that backwards migrations
roll back to just after the application of the named migration, and all
its dependencies are unapplied.
The problem here is the way we specify nodes on the graph - the choice of
the same namespace and format as forwards migrations is unfortunate, and
perhaps instead we should have backwards migrations go to *before* the
named migration rather than afterward (so you're asking to end up with the
one you named unapplied) - we'd need to have an alternate syntax for this
now, though, since we've shipped something as it is.
I'm going to close this as INVALID, as it's performing exactly as designed
(though unfortunately different to South). I wouldn't be averse to a new
ticket for better docs or perhaps even a second input argument format for
"before this migration" rather than "just after", it's the sort of thing
that would work well for a sprint.
--
Ticket URL: <https://code.djangoproject.com/ticket/23410#comment:3>
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