#22296: m2m_changed pk_set value inconsistent between post_add and post_remove
-------------------------------------+-------------------------------------
Reporter: anentropic | Owner: nobody
Type: Bug | Status: closed
Component: Database layer | Version: 1.5
(models, ORM) |
Severity: Normal | Resolution: duplicate
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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Changes (by Carlton Gibson):
* status: new => closed
* resolution: => duplicate
Comment:
As per #29615, the behaviour here is now different.
* For `add()`, multiple calls with the same ids now only result in a
single signal being dispatched.
* For `delete()`, the signal is dispatched each time.
See [https://code.djangoproject.com/ticket/29615#comment:2 comment on
#29615] for more detail but, the underlying difference is that `add()`
calls filter duplicates to avoid `IntegrityError` when inserting the
records. There's no need for this with delete.
Happy for others to comment differently but, I thought on #29615 that the
extra DB query would not be worth it to eliminate the extra signal, but
that the anomaly could be documented.
Given all that I'll close this as a duplicate (despite it being the older
ticket, and my having previous thought them not duplicates... sigh...).
Further discussion on #29615 please.
--
Ticket URL: <https://code.djangoproject.com/ticket/22296#comment:3>
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