#35350: Crash on write of new instance when using GeneratedField
-------------------------------------+-------------------------------------
Reporter: Matt Hegarty | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 5.0
(models, ORM) |
Severity: Normal | Resolution:
Keywords: GeneratedField | 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 Matt Hegarty:
Old description:
> We have an [https://github.com/django-import-export/django-import-
> export/issues/1779 issue in django-import-export] where imports of new
> instances fails when the model has a GeneratedField.
>
> This occurs when an instance is being created which doesn't already exist
> in the database, which the
> [https://docs.djangoproject.com/en/5.0/ref/models/fields/#generatedfield
> docs] imply is supported by GeneratedField:
>
> A stored generated column is computed when it is written (inserted or
> updated)
>
> The stack trace is attached.
>
> Steps to reproduce:
>
> 1. Clone [https://github.com/matthewhegarty/django-import-
> export/tree/issue-1779-generatedfield this repo] and use the
> 'issue-1779-generatedfield' branch.
> 2. Create a [https://django-import-
> export.readthedocs.io/en/4.0.0-rc.1/contributing.html#development venv]
> 3. Install the example app following the instructions [https://django-
> import-export.readthedocs.io/en/4.0.0-rc.1/installation.html#example-app
> here]
> 4. Navigate to "Books", click "Import", then select the attached
> sample.csv file.
> 5. Click "Submit" and you will see the error.
New description:
We have an [https://github.com/django-import-export/django-import-
export/issues/1779 issue in django-import-export] where imports of new
instances fails when the model has a GeneratedField.
This occurs when an instance is being created which doesn't already exist
in the database, which the
[https://docs.djangoproject.com/en/5.0/ref/models/fields/#generatedfield
docs] imply is supported by GeneratedField:
A stored generated column is computed when it is written (inserted or
updated)
The stack trace is attached.
Steps to reproduce:
1. Clone [https://github.com/matthewhegarty/django-import-
export/tree/issue-1779-generatedfield this repo] and use the
'issue-1779-generatedfield' branch.
2. Create a [https://django-import-
export.readthedocs.io/en/4.0.0-rc.1/contributing.html#development venv]
3. Install the example app following the instructions [https://django-
import-export.readthedocs.io/en/4.0.0-rc.1/installation.html#example-app
here]
4. Navigate to "Books", click "Import", then select the attached
sample.csv file.
5. Click "Submit" and you will see the error.
* python 3.12
* django 5.0.3
--
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Ticket URL: <https://code.djangoproject.com/ticket/35350#comment:1>
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