#32554: Add Q.TRUE, Q.FALSE, Q.any() and Q.all()
-------------------------------------+-------------------------------------
Reporter: jonathan-golorry | Owner: jonathan-
| golorry
Type: New feature | Status: assigned
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: Q objects, any, all | Triage Stage:
| Unreviewed
Has patch: 1 | Needs documentation: 1
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by jonathan-golorry:
Old description:
> `Q.FALSE` and `Q.TRUE` are classattribute aliases for `Q(pk__in=[])` and
> `~Q(pk__in=[])`.
>
> `Q.any()` and `Q.all()` mimic python's builtin `any` and `all`,
> defaulting to `Q.FALSE` and `Q.TRUE` for empty iterators (or iterators
> containing only empty Q objects).
>
> Patch: https://github.com/django/django/pull/14131
>
> See this forum thread discussing why these are an improvement over many
> ad-hoc implementations people are using:
> https://forum.djangoproject.com/t/improving-q-objects-with-true-false-
> and-none/851
>
> My patch relies on https://code.djangoproject.com/ticket/32548 and
> https://code.djangoproject.com/ticket/32549. I kept those as separate
> tickets because they each had side effects that warranted their own
> discussion.
New description:
`Q.empty()` checks for nested empty Q objects such as `Q(Q())`. See #32549
for rationale.
`Q.FALSE` and `Q.TRUE` are classattribute aliases for `Q(pk__in=[])` and
`~Q(pk__in=[])`.
`Q.any()` and `Q.all()` mimic python's builtin `any` and `all`, defaulting
to `Q.FALSE` and `Q.TRUE` for empty iterators (or iterators containing
only empty Q objects).
Patch: https://github.com/django/django/pull/14159
See this forum thread discussing why these are an improvement over many
ad-hoc implementations people are using:
https://forum.djangoproject.com/t/improving-q-objects-with-true-false-and-
none/851
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Ticket URL: <https://code.djangoproject.com/ticket/32554#comment:2>
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