#19544: IntegrityError during Many To Many add()
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Reporter: Kronuz | Owner: nobody
Type: | Status: new
Cleanup/optimization | Version: 1.4
Component: Database layer | Resolution:
(models, ORM) | Triage Stage:
Severity: Normal | Someday/Maybe
Keywords: | Needs documentation: 0
Has patch: 0 | Patch needs improvement: 0
Needs tests: 0 | UI/UX: 0
Easy pickings: 0 |
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Comment (by Patrick Robertson <django@…>):
Looking at the code (very briefly), I think _add_items in
db/models/fields/relate.py (line 672 ish) might be what's causing the
problem.
We're saving a list of ids `new_ids` which is later used for the bulk
creation. As you can see, if this method were called twice at the same
time for whatever reason (I think in my case it was probably a double
submit of the form) then a race condition could occurr
--
Ticket URL: <https://code.djangoproject.com/ticket/19544#comment:6>
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