#30460: ManyToMany relationships with a custom `through` do not respect
Meta.ordering on the intermediary model
-------------------------------------+-------------------------------------
Reporter: ryanpetrello | Owner: nobody
Type: New feature | Status: new
Component: Database layer | Version: 2.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Simon Charette):
* needs_better_patch: 0 => 1
* has_patch: 0 => 1
* type: Bug => New feature
* stage: Unreviewed => Accepted
Comment:
I wouldn't say this is actually a bug as many-to-many field managers have
always supported ordering on their referenced model
Adding support for `through._meta.ordering` has backward compatibility
concerns as we have to decide how to deal with `ordering` defined on both
the `through` and `to` model. Should the `through` ordering have
precedence over the `to`ordering? Should they be merged together? We also
have to make sure whatever we do regarding ordering translation honors the
mechanisms in place to exclude `Meta.ordering` from aggregation as naively
translating it into an `order_by` call will bypass the checks added in
1b1f64ee5a78cc217fead52cbae23114502cf564 for #14357.
In my opinion the resulting ordering should be `through._meta.ordering` +
`to._meta.ordering`. This might require a django-developers thread to
gather feedback though.
Accepting the ticket on the basis that it seems like a feature that should
be supported but the current PR requires significant adjustments first.
--
Ticket URL: <https://code.djangoproject.com/ticket/30460#comment:1>
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