#34444: Summing through a One-to-Many relationship on the property of a
JSONField
fails
-------------------------------------+-------------------------------------
Reporter: Clément | Owner: nobody
Escolano |
Type: Bug | Status: new
Component: Database | Version: 4.1
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 |
-------------------------------------+-------------------------------------
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
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/34444>
Django <https://code.djangoproject.com/>
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