#34754: CheckConstraint with isnull lookup on JSONField transform None into null
jsonb value
-------------------------------------+-------------------------------------
Reporter: Alexandre Collet | Owner: Simon
| Charette
Type: Bug | Status: assigned
Component: Database layer | Version: 4.2
(models, ORM) |
Severity: Release blocker | Resolution:
Keywords: constraint, | Triage Stage: Accepted
jsonfield, none, check |
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by Simon Charette):
* owner: nobody => Simon Charette
* status: new => assigned
* has_patch: 0 => 1
Comment:
Submitted a patch to address the issue but I think the fundamental problem
here is that
{{{#!python
MyModel.objects.create(values=None) # Creates an object with a SQL NULL
MyModel.objects.filter(values=None) # Filters for objects with JSON NULL
}}}
This asymmetry prevents logic from being added to
`JSONField.get_db_prep_value` directly but it's a much larger problem to
resolve.
Just like [https://docs.djangoproject.com/en/4.2/ref/models/fields/#null
we discourage] the usage of `null=True, blank=True` fields as allows for
the co-existence of two ''no data'' values I think we should do add
''friction'' to storing `null` in a `JSONField(null=True)` field by
requiring that `Value(None, JSONField())` be used to filter using
`'null'::json`.
I can't think of a deprecation path for
`MyModel.objects.filter(values=None)` though unfortunately so it seems
like we've missed the boat on that one.
--
Ticket URL: <https://code.djangoproject.com/ticket/34754#comment:4>
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