#31295: required ModelChoiceField makes duplicate (cursor) queries to the
database
-------------------------------------+-------------------------------------
Reporter: Aurélien Pardon | Owner: nobody
Type: | Status: closed
Cleanup/optimization |
Component: Forms | Version: 2.2
Severity: Normal | Resolution: needsinfo
Keywords: Model | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Aurélien Pardon):
The fact that the following code makes '''two''' requests to the database
:
{{{#!python
class MyModel(models.Model):
my_field = models.CharField(max_length=1)
class MyForm(forms.Form):
my_form_field = forms.ModelChoiceField(MyModel.objects.all(),
empty_label=None)
my_form.as_ul()
}}}
is absolutely not working as intended. Show this to any other core dev and
ask them, please.
This whole "invalid HTML code" is not an important issue. It happens yes,
but under very rare circumstances (a blank primary key and an {{{INSERT}}}
between the two '''identical''' requests to the database), and it also
won't bother any browser. I can work hard and show you the invalid HTML
code (using database trigger to emulate race conditions?) but honestly
it's not the problem.
--
Ticket URL: <https://code.djangoproject.com/ticket/31295#comment:9>
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