#25307: Cannot use .annotate with conditional expressions
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Reporter: jproffitt | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: master
(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 freshquiz):
I'm not sure when/how, but the `condition` attribute of the `When`
`Expression` gets converted to a `django.db.models.sql.where.WhereNode`,
so it's actually a `WhereNode` object that is having
`.get_source_expressions()` called on it.
Regardless, `django.db.models.expressions.When`'s
`get_source_expressions()` and `set_source_expressions()` methods need to
bridge the gap between `Expression`s and `django.utils.tree.Node`s, in
order to properly re-write the column names to the aliases from the
subquery.
I can't see a quick/easy way to do this, but as I'm not experienced in the
ORM code, I could be wrong.
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Ticket URL: <https://code.djangoproject.com/ticket/25307#comment:7>
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