#25307: Cannot use .annotate with conditional expressions
-------------------------------------+-------------------------------------
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
-------------------------------------+-------------------------------------
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.
--
Ticket URL: <https://code.djangoproject.com/ticket/25307#comment:7>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to django-updates+unsubscr...@googlegroups.com.
To post to this group, send email to django-updates@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/067.908f810f88c9a516eeea73c9b2258e44%40djangoproject.com.
For more options, visit https://groups.google.com/d/optout.
