#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: needsinfo
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Adam Alton):
I've now dug further into what happened in my case.
It turns out that I actually wrote a custom migration when I moved from
the custom `JSONField` (which subclassed `models.TextField`) to the built-
in `models.JSONField`. I think I must have underestimated how clever
Django would be in doing that conversion, and so I wrote a custom
`migrations.RunSQL`, assuming that Django wouldn't do the right conversion
for me. My custom migration did something like this:
{{{
ALTER TABLE my_table ALTER COLUMN my_field TYPE JSON USING my_field::JSON;
}}}
I'd totally forgotten about this (and failed to see it when I looked
through my migrations before I raised this ticket).
So in my case, I'm pretty sure that the problem was my own fault for doing
`my_field::JSON` instead of `my_field::JSONB`. (And for assuming that
Django wouldn't be clever enough to do this for me!) Sorry for the false
alarm on this ticket, and thank you @felixxm for your help.
I hope that this info helps the other people who've got this error to get
to the bottom of what's going on in their case. But whatever it is, my
guess is that it's not a bug in Django!
--
Ticket URL: <https://code.djangoproject.com/ticket/31973#comment:14>
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