[Django] #35061: Modifying GeneratedFields is not supported - not documented under model field reference for GeneratedField
Django
field reference for GeneratedField
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Reporter: ldeluigi | Owner: nobody
Type: Uncategorized | Status: new
Component: Documentation | Version: 5.0
Severity: Normal | Keywords: docs
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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When I attempted to migrate an alteration of a db-persisted
GeneratedField, I got the ValueError:
Modifying GeneratedFields is not supported - the field XYZ must be removed
and re-added with the new definition.
I couldn't find help nor hint for that in the documentation, especially
under the model field reference for GeneratedField.
I'd like to see that documented, if possible with help for workarounds
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Ticket URL: <https://code.djangoproject.com/ticket/35061>
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Django
field reference for GeneratedField
Reporter: ldeluigi | Owner: nobody
Type: | Status: closed
Cleanup/optimization |
Component: Documentation | Version: 5.0
Severity: Normal | Resolution: wontfix
Keywords: docs | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
Changes (by Mariusz Felisiak):
* status: new => closed
* type: Uncategorized => Cleanup/optimization
* resolution: => wontfix
Comment:
Thanks for this ticket, however, raised exception is clear and it contains
a hint: ''"must be removed and re-added"''. Modifying `GeneratedFields` is
not possible in most cases, and even if it's, it still has many db-
specific restrictions. This is not something that we want to support and
workaround doesn't exists. It's not worth documenting.
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Ticket URL: <https://code.djangoproject.com/ticket/35061#comment:1>
Django
field reference for GeneratedField
-------------------------------------+-------------------------------------
Reporter: ldeluigi | Owner: nobody
Type: | Status: closed
Cleanup/optimization |
Component: Documentation | Version: 5.0
Severity: Normal | Resolution: wontfix
Keywords: docs | 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 Simon Charette):
Not saying we should take any action or revisit supporting recreating
generated fields (making alter do an implicit remove + add) but
[https://www.depesz.com/2024/01/15/waiting-for-postgresql-17-alter-table-
command-to-change-generation-expression/ I found it interesting that
PostgreSQL was planning to add support for it in 17] through a non-
standard SQL extension.
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Ticket URL: <https://code.djangoproject.com/ticket/35061#comment:2>