Hello Cleiton,
I'm a bit surprised only two queries were executed on 1.10 as each
time a city string representation is created the associated state
will need to be fetched as well.
Were you using any form of select_related()/prefetch_related() to make
sure this wasn't an issue? It's possible that the template based widget
rendering introduced in 1.11 broke your optimization somehow that would
be an actual bug.
Simon
Le vendredi 12 mai 2017 13:03:23 UTC-4, Cleiton Lima a écrit :
>
> I do not know if it is a bug or has already been commented
>
> # models.py
> class State(models.Model):
> name = models.CharField(_('name'), max_length=60)
>
>
> class Meta:
> verbose_name = _('state')
> verbose_name_plural = _('states')
>
>
> def __str__(self):
> return self.name
>
> class City(models.Model):
> name = models.CharField(_('name'), max_length=60)
> state = models.ForeignKey('State', verbose_name=_('state'),
> related_name='cities')
>
>
> class Meta:
> verbose_name = _('city')
> verbose_name_plural = _('cities')
>
>
> def __str__(self):
> return '{} - {}'.format(self.name, self.state.name)
>
> # forms.py
> class AnythingForm(forms.ModelForm):
> class Meta:
> model = Anything
> fields = ['city']
>
> # template.html
> {{form.city}}
>
> I have 5565 records in model City.
>
> Django==1.11.1 execute 5565 queries to render select
> Django==1.10.7 only 2
>
> If replace return '{} - {}'.format(self.name, self.state.name) to
> self.name in __str__ of city model, it works.
>
> Is this really a problem or my mistake?
>
>
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