#33114: StringAgg always fails on TextField
-------------------------------------+-------------------------------------
Reporter: Swen | Owner: nobody
Kooij |
Type: | Status: new
Uncategorized |
Component: Database | Version: 3.2
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Example:
{{{#!python
class MyModel(models.Model):
name = models.TextField()
list(MyModel.objects.annotate(names=StringAgg('name', ',')))
}}}
Results in the error:
{{{
django.core.exceptions.FieldError: Expression contains mixed types:
TextField, CharField. You must set output_field.
}}}
There are two possible work-arounds:
1. Derive from `StringAgg` and set the `output_field`:
{{{#!python
class TextStringAgg(StringAgg):
output_field = TextField()
}}}
2. Wrap the expression in `ExpressionWrapper`:
{{{#!python
ExpressionWrapper(StringAgg('name', ','), output_field=TextField())
}}}
This seems to be a regression introduced in 3.2 as part of this change:
https://github.com/django/django/commit/1e38f1191de21b6e96736f58df57dfb851a28c1f
--
Ticket URL: <https://code.djangoproject.com/ticket/33114>
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