#28822: Add DBCalculatedField to model to annotate models automatically
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Reporter: Ilya | Owner: nobody
Type: New feature | Status: new
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Matthijs Kooijman):
I found one more case where this feature would be tremendously useful:
Admin filtering on annotations. Currently, you can very easily filter on
fields in the admin, using `ModelAdmin.list_filter`, but to filter on an
annotation, you need to implement your own `SimpleListFilter` that
handles everything, potentially duplicating a lot of code that is already
in `FieldListFilter` and its subclasses (I tried some wrapping and using
`FieldListFilter.create` passing a field instance, which worked for a
choice field but failed for `AllValuesFieldListFilter` because it insists
looking up the reverse field path for the filtered field).
If `DBCalculatedField`s (or something similar) would be implemented, it
would become possible (possibly with some minor changes to the admin list
filter code, but maybe not even that) to just specify the name of the
annotion in`ModelAdmin.list_filter` and have a filter interface just like
for a real field.
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Ticket URL: <https://code.djangoproject.com/ticket/28822#comment:9>
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