#23624: Regression in ManyToManyField with through, runtime-generated models
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Reporter: ludoo | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.7
(models, ORM) | Resolution:
Severity: Normal | Triage Stage:
Keywords: | Unreviewed
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 ludoo):
Replying to [comment:5 bmispelon]:
> I've bisected the error to this commit:
9f13c3328199d2fa70235cdc63bb06b1efc5b117
Fantastic. The commit points to the solution: a run-time generated models
module does not belong to any app, so its models are not used to resolve
complex relations.
Creating an AppConfig instance at runtime with the correct name, and a
module with a 'models' attribute pointing to the run-time generated models
module is not enough though, as one also needs to do some of the stuff
that gets done in the app registry's populate method when it's
initialized. It's a few lines of code but it feels weird and unclean, it
would be ideal if the apps registry had a way to register apps after it
has been initialized.
> Still not sure if this is a bug in Django or if your use-case is just
not supported. It certainly looks weird.
I admit the use-case is a bit specialized, but it's something that used to
work in 1.6, and it can be easily made to work in 1.7 with the steps
outlined above. The only problem I see is that finding *how* it works is
almost impossible for a regular person (it took your involvement to
pinpoint the correct commit, etc.). Having a way to register dynamically
generated apps/models, and somewhere in the docs that states how to do it
would be enough for the few people needing it, I guess.
BTW, my use-case is the Wordpress multi-blog database (each blog has its
own set of tables, etc), so it's probably a db design used in lots of
other legacy databases.
--
Ticket URL: <https://code.djangoproject.com/ticket/23624#comment:7>
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