#27303: Allow FilterSpecs to return Q-likes
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Reporter: Yeago | Owner: nobody
Type: New feature | Status: new
Component: contrib.admin | Version: 1.10
Severity: Normal | Keywords: filterspec
Triage Stage: Unreviewed | Has patch: 1
Easy pickings: 0 | UI/UX: 0
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Problems arise when filtering across relations in the admin. The current
method relies on FilterSpecs chaining filter() clauses. While these create
explicit ANDs when filtering on fields on a single table (expected), they
imply OR when a filter crosses a relation because each filter() clause
creates a new join.
Consider a case where someone would want to filter across all People who
have a Contact between dates X and Y that is on_phone (as opposed to
in_person). In the current state of the admin, you can't arrive at this
list because of the above subtlety with how chained filters() change
behavior when spanning relations (which I would argue, this hypothetical
user doesn't care about).
https://github.com/yeago/django-1/commit/bccabbfcf443f0fac511599ccfdf166bb1697b6b
I believe allowing FilterSpec objects to return Q-likes is a happy middle-
ground that doesn't break current assumptions.
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Ticket URL: <https://code.djangoproject.com/ticket/27303>
Django <https://code.djangoproject.com/>
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