#34144: Casting a string inside a JSONField into an integer does not work on
PostgreSQL
-------------------------------------+-------------------------------------
Reporter: Clément Escolano | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 4.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: postgresql, | Triage Stage:
jsonfield, cast | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by Clément Escolano:
Old description:
> Hello
>
> When casting an integer represented as a string inside a JSONField on
> PostgreSQL, there is the following error:
>
> {{{
> django.db.utils.DataError: cannot cast jsonb string to type integer
> }}}
>
> To reproduce the error, you can create a simple model with a JSONField:
>
> {{{
> class MyModel(models.Model):
> data = models.JSONField()
>
> MyModel.objects.create(data={"value": "3"})
>
> MyModel.objects.annotate(actual_value=Cast("data__value",
> output_field=IntegerField())).first()
> }}}
>
> The produced query is the following:
>
> {{{
> SELECT "myapp_mymodel"."id",
> (("myapp_mymodel"."data" -> 'value'))::integer AS "actual_value"
> FROM "myapp_mymodel"
> LIMIT 1;
> }}}
>
> This [https://stackoverflow.com/a/25810945 stackoverflow question] hints
> that adding an extra ">" after "->" fixes it and indeed the following
> query returns the correct result:
>
> {{{
> SELECT "myapp_mymodel"."id",
> (("myapp_mymodel"."data" ->> 'value'))::integer AS "actual_value"
> FROM "myapp_mymodel"
> LIMIT 1;
> }}}
>
> The code is already working on SQLite.
New description:
Hello
When casting an integer represented as a string inside a JSONField on
PostgreSQL, there is the following error:
{{{
django.db.utils.DataError: cannot cast jsonb string to type integer
}}}
It works with a SQLite database.
To reproduce the error, you can create a simple model with a JSONField:
{{{
class MyModel(models.Model):
data = models.JSONField()
MyModel.objects.create(data={"value": "3"})
MyModel.objects.annotate(actual_value=Cast("data__value",
output_field=IntegerField())).first()
}}}
The produced query is the following:
{{{
SELECT "myapp_mymodel"."id",
"myapp_mymodel"."data",
(("myapp_mymodel"."data" -> 'value'))::integer AS "actual_value"
FROM "myapp_mymodel"
LIMIT 1;
}}}
This [https://stackoverflow.com/a/25810945 stackoverflow question] hints
that adding an extra ">" after "->" fixes it and indeed the following
query returns the correct result:
{{{
SELECT "myapp_mymodel"."id",
"myapp_mymodel"."data",
(("myapp_mymodel"."data" ->> 'value'))::integer AS "actual_value"
FROM "myapp_mymodel"
LIMIT 1;
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/34144#comment:1>
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