#22571: Document implications of using auto_now_add=True and get_or_create
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Reporter: nu.everest@… | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Documentation | Version: 1.4
Severity: Normal | Resolution:
Keywords: integrityerror | Triage Stage: Accepted
auto_now_add get_or_create |
duplicatekey |
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by iambibhas):
* cc: me@… (added)
Comment:
Replying to [comment:5 charettes]:
> {{{#!python
> In [1]: from app.models import Auto, Default, timezone
>
> In [2]: added = timezone.now()
>
> In [3]: Auto.objects.get_or_create(added=added)
> Out[3]: (<Auto: Auto object>, True)
>
> In [4]: Auto.objects.get_or_create(added=added)
> Out[4]: (<Auto: Auto object>, True)
>
> In [5]: Default.objects.get_or_create(added=added)
> Out[5]: (<Default: Default object>, True)
>
> In [6]: Default.objects.get_or_create(added=added)
> Out[6]: (<Default: Default object>, False)
> }}}
Isn't this expected? The doc says -
> DateField.auto_now_add
>
> Automatically set the field to now when the object is first created.
Useful for creation of timestamps. Note that the current date is *always*
used; it’s not just a default value that you can override.
And the code also shows that the value with always set to `timezone.now()`
if `auto_now_add` is set, even if you provide a value when creating it.
--
Ticket URL: <https://code.djangoproject.com/ticket/22571#comment:6>
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