#34444: Summing through a One-to-Many relationship on the property of a
JSONField
fails
-------------------------------------+-------------------------------------
Reporter: Clément Escolano | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 4.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| 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 summing through a One-to-Many relationship on the property of a
> JSONField, there is the following error
> {{{
> TypeError: the JSON object must be str, bytes or bytearray, not int
> }}}
>
> To reproduce the error, you can create a model that is linked to another
> model with a JSONField:
>
> {{{
> class Group(models.Model):
> name = models.TextField()
>
> class Membership(models.Model):
> group = models.ForeignKey(Group, related_name="memberships")
> extra = models.JSONField()
> }}}
>
> Then create a group and a membership with an amount in the JSONField:
>
> {{{
> group = Group.objects.create(name="Test")
> Membership.objects.create(group=group, extra={"amount": 5})
> }}}
>
> Finally, a request is made to sum the `amount` property for every group:
>
> {{{
> Group.objects.annotate(total=Sum("memberships__extra__amount"))
> }}}
>
> Note that the SQL query made by Django is correct but the code still
> raises the error
>
> {{{
> TypeError: the JSON object must be str, bytes or bytearray, not int
> }}}
New description:
Hello,
When summing through a One-to-Many relationship on the property of a
JSONField, there is the following error
{{{
TypeError: the JSON object must be str, bytes or bytearray, not int
}}}
To reproduce the error, you can create a model that is linked to another
model with a JSONField:
{{{
class Group(models.Model):
name = models.TextField()
class Membership(models.Model):
group = models.ForeignKey(Group, related_name="memberships")
extra = models.JSONField()
}}}
Then create a group and a membership with an amount in the JSONField:
{{{
group = Group.objects.create(name="Test")
Membership.objects.create(group=group, extra={"amount": 5})
}}}
Finally, a request is made to sum the `amount` property for every group:
{{{
groups =
Group.objects.annotate(total=Sum("memberships__extra__amount")).all()
groups[0].total
}}}
The SQL query is correct and returns the right information but accessing
the data raises the error
{{{
TypeError: the JSON object must be str, bytes or bytearray, not int
}}}
--
--
Ticket URL: <https://code.djangoproject.com/ticket/34444#comment:1>
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