#28872: JSONField __in operator breaks when given a values_list()
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Reporter: Jerome Leclanche | Owner: (none)
Type: Bug | Status: new
Component: contrib.postgres | Version: 1.11
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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Changes (by Tim Graham):
* stage: Unreviewed => Accepted
Old description:
> Prerequisites
>
> 1. Create a model MyModel1 with the field `resource = JSONField()`.
> 2. Create another model MyModel2 with a field `id =
> CharField(max_length=255)`
>
> Reproduce by doing
> `MyModel1.objects.filter(resource__foo__id__in=MyModel2.objects.all().values_list("id"))`
>
> Expected result: Should look at MyModel1 for objects with `resource`
> matching `{"foo": {"id": <id>}}`.
>
> Actual result:
>
> ERROR: operator does not exist: jsonb = character varying
> LINE 1: ...AND ("resource" #> '{foo,id}') IN (SELECT...
>
> The actual issue is that when passing a values_list() to __in, the values
> list is not cast to jsonb (unlike when passing a text type). In the
> resulting sql, we can see `IN (SELECT U0."id" AS Col1 FROM mymodel2 U0
> ...)`. Wrapping `to_json(U0."id")` solves the issue.
New description:
Prerequisites
1. Create a model MyModel1 with the field `resource = JSONField()`.
2. Create another model MyModel2 with a field `id =
CharField(max_length=255)`
Reproduce by doing
`MyModel1.objects.filter(resource__foo__id__in=MyModel2.objects.all().values_list("id"))`
Expected result: Should look at MyModel1 for objects with `resource`
matching `{"foo": {"id": <id>}}`.
Actual result:
{{{
ERROR: operator does not exist: jsonb = character varying
LINE 1: ...AND ("resource" #> '{foo,id}') IN (SELECT...
}}}
The actual issue is that when passing a `values_list()` to `__in`, the
values list is not cast to jsonb (unlike when passing a text type). In the
resulting sql, we can see `IN (SELECT U0."id" AS Col1 FROM mymodel2 U0
...)`. Wrapping `to_json(U0."id")` solves the issue.
--
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Ticket URL: <https://code.djangoproject.com/ticket/28872#comment:2>
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