#26693: RenameModel causes state.apps rendering leading to massive time
increase in
makemigrations
--------------------------------------+------------------------------------
Reporter: simonpercivall | Owner: nobody
Type: Cleanup/optimization | Status: closed
Component: Migrations | Version: 1.9
Severity: Normal | Resolution: fixed
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 1
Needs tests: 0 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 1
--------------------------------------+------------------------------------
Changes (by heindshed):
* status: new => closed
* needs_better_patch: 0 => 1
* needs_docs: 0 => 1
* ui_ux: 0 => 1
* resolution: => fixed
Old description:
> Not 100% sure I have complete understanding of what happens, or why, but
> it seems a `RenameModel` migration leads to an evaluation of
> `state.apps`, which affects the time it takes for it and all following
> migration states to be calculated.
>
> This is for a pretty big app, with lots of migrations. The time to run
> `makemigrations` for all apps goes from 1 seconds to 77 seconds with one
> `RenameModel` migration.
>
> A test where `apps.state` was replaced by `temp_state = state.close();
> apps = temp_state.apps` resolved the issue, but I'm not completely sure
> of the side effects of doing that. (Or even better if it were possible to
> check immediately if `'apps' in state.__dict__` and skip the rendering
> completely.)
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