#29725: Inefficient SQL generated when counting a ManyToMany
-------------------------------------+-------------------------------------
Reporter: Gavin Wahl | Owner: oliver
Type: | Status: assigned
Cleanup/optimization |
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
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 oliver):
Thanks for your advice.
I will try to correct it according to your advice soon
Replying to [comment:2 Simon Charette]:
> Hello Olivier,
>
> I think you should be able to achieve this by defining a `count()`
method on the dynamic class created by
`create_forward_many_to_many_manager` by filtering
`self.through._default_manager` based on `self.instance` and return its
`count()`.
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Ticket URL: <https://code.djangoproject.com/ticket/29725#comment:4>
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