#31973: TypeError loading data in JSONField if DB has native JSON support
-------------------------------------+-------------------------------------
Reporter: Adam Alton | Owner: nobody
Type: Bug | Status: closed
Component: Database layer | Version: 3.1
(models, ORM) |
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by giacomo):
* cc: giacomo (added)
Comment:
I'm also experiencing this error on Django >= 3.1.1 when using
`jsonb_array_length` on a `JSONField` that contains a list:
{{{
class MyModel(models.Model):
field = JSONField(default=list)
>>> MyModel.objects.annotate(field_len=Func(F('field'),
function='jsonb_array_length'))
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/home/ubuntu/text-annotation/lib/python3.8/site-
packages/django/db/models/query.py", line 263, in __repr__
data = list(self[:REPR_OUTPUT_SIZE + 1])
File "/home/ubuntu/text-annotation/lib/python3.8/site-
packages/django/db/models/query.py", line 287, in __iter__
self._fetch_all()
File "/home/ubuntu/text-annotation/lib/python3.8/site-
packages/django/db/models/query.py", line 1308, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/home/ubuntu/text-annotation/lib/python3.8/site-
packages/django/db/models/query.py", line 70, in __iter__
for row in compiler.results_iter(results):
File "/home/ubuntu/text-annotation/lib/python3.8/site-
packages/django/db/models/sql/compiler.py", line 1100, in apply_converters
value = converter(value, expression, connection)
File "/home/ubuntu/text-annotation/lib/python3.8/site-
packages/django/db/models/fields/json.py", line 83, in from_db_value
return json.loads(value, cls=self.decoder)
File
"/home/ubuntu/.pyenv/versions/3.8.6/lib/python3.8/json/__init__.py", line
341, in loads
raise TypeError(f'the JSON object must be str, bytes or bytearray, '
TypeError: the JSON object must be str, bytes or bytearray, not int
}}}
Things that I checked after finding this ticket:
* the `JSONField` was "converted" from the `JSONField` of the old Postgres
contrib package (afaik no actual migration happened)
* in my table, the corresponding field was correctly set to `jsonb`
* downgrading to Django 3.1 makes it work
I've resorted to using raw SQL for this query, as suggested by @Andrew.
--
Ticket URL: <https://code.djangoproject.com/ticket/31973#comment:19>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to django-updates+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/067.17c37cf20fc30c0405a7d45bc4e764f8%40djangoproject.com.
