#26722: Django silently discarding the user-provided on_delete with
GenericRelation
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Reporter: Delizin | Owner: nobody
Type: Bug | Status: new
Component: contrib.contenttypes | Version: 1.9
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 Humberto Rocha):
Hi, I have some models that rely at GenericRelations and recently
discovered that some data was disappearing from the database so i
discovered that issue.
There's any explanation on why GenericRelations can not have a SET_NULL or
even DO_NOTING implemented as a possible option of on_delete parameter?
The docs only states that "Unlike ForeignKey, GenericForeignKey does not
accept an on_delete argument to customize this behavior; if desired, you
can avoid the cascade-deletion simply by not using GenericRelation, and
alternate behavior can be provided via the pre_delete signal." which is
kind of vague.
Currently I am trying to tweak a little the GenericRelation code to see if
I can add at least the DO_NOTING behavior to it but even if I change the
this hardcoded line
[https://github.com/django/django/blob/c02d473781dc2e8699db8edd37cc77f7d43993fc/django/contrib/contenttypes/fields.py#L297]
from CASCADE to DO_NOTHING it seems to be ignored.
If anyone could help me out by pointing the way to follow on that would be
very helpful
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Ticket URL: <https://code.djangoproject.com/ticket/26722#comment:2>
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