#28933: Implement a range-based filter for Django Admin date_hierarchy
-----------------------------------------+--------------------------------
Reporter: hakib | Owner: nobody
Type: New feature | Status: new
Component: contrib.admin | Version: 2.0
Severity: Normal | Keywords: date_hierarchy
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-----------------------------------------+--------------------------------
The predicate generated by date_hierarchy makes it very difficult for
databases to optimize the query.
The following date hierarchy:
{{{
/admin/app/model?created__year=2017&created__month=12&created__day=16
}}}
Will generate the following where clause (PostgreSql):
{{{
WHERE created between '2017-01-01' and '2017-31-12' and EXTRACT('month',
created) = 12 and EXTRACT('day', created) = 16
}}}
The query above will not be able to utilize range based indexes on the
date hierarchy column - on big tables this has a significant performance
impact.
The current implementation of date hierarchy is relying on the "default"
filtering mechinizem used by Django Admin. **I propose implementing custom
filtering for Django Admin that will better utilize it's hierarchical
nature and make it more database "friendly".**
Instead of the query above the date hierarchy would generate the following
predicates for different levels of the heirarchy:
{{{
/admin/app/model?created__year=2017&created__month=12&created__day=16
WHERE created >= '2017-12-16' and created < '2017-12-17'
}}}
{{{
/admin/app/model?created__year=2017&created__month=12
WHERE created >= '2017-12-01' and created < '2018-01-01'
}}}
{{{
/admin/app/model?created__year=2017
WHERE created >= '2017-01-01' and created < '2018-01-01'
}}}
I already [wrote about this issue](https://codeburst.io/django-admin-
range-based-date-hierarchy-37955b12ea4e) and [published a
package](https://github.com/hakib/django-admin-lightweight-date-
hierarchy/blob/master/django_admin_lightweight_date_hierarchy/admin.py)
that implement the above as a custom SimpleListFilter.
I already have a PR ready - I'm following proper protocol here so please
let me know if this is acceptable.
--
Ticket URL: <https://code.djangoproject.com/ticket/28933>
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