#25733: Change of inherited model's primary key not spotted by makemigrations
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Reporter: dracos | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.8
Severity: Normal | Resolution:
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 dracos):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Comment:
Looking further, some more interesting details arise. If I use
"sqlmigrate", the output does include lines to drop the Speaker
constraint, alter the Speaker's person_ptr_id and putting a constraint
back; but running "migrate" does not include those lines, that constraint
is not dropped and so you get the error I quote above when it tries to
alter Person's ID to a CharField.
However, it actually wouldn't matter if those lines were present, because
running the sqlmigrate output manually, you get a different constraint
failure, the error then changes to be on the same line, but because of
ForeignKey constraints on other models pointing at the Speaker table (ie.
I have a Speech table with a speaker ForeignKey). As well as the direct
constraint, all the constraints associated with the subclass model need to
be dropped first too, it looks like.
So possibly two separate issues: sqlmigrate and migrate not having/running
the same SQL, and not enough constraints being dropped to enable a key to
be changed from implicit to a CharField.
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Ticket URL: <https://code.djangoproject.com/ticket/25733#comment:1>
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