#33848: Migration StateApps.clone deepcopy too many objects
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Reporter: Iuri de Silvio | Owner: nobody
Type: Cleanup/optimization | Status: new
Component: Migrations | Version: 4.0
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 1
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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`StateApps.clone` execute two slow deep copies. The first one copy all
models. The second one copy app configs, that include all apps and the
specific app models.
In my application, with ~250 models, this deepcopy is around 5% of
migration time. I was able to cleanup `StateApps` before copy, to not copy
all models and apps every operation again.
https://github.com/django/django/blob/d4c5d2b52c897ccc07f04482d3f42f976a79223c/django/db/migrations/state.py#L683
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Ticket URL: <https://code.djangoproject.com/ticket/33848>
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