Look like it is expected behaviour.
filter builds sql, any sql should have sence. What is sence with broken sql
?
Many thanks,
Serge
+380 636150445
skype: skhohlov
On Wed, Jun 15, 2016 at 1:09 PM, Seti Volkylany <setivolkyl...@gmail.com>
wrote:
> The model next:
>
> class Writter(models.Model):
> """
> Model for writters of books
> """
>
> id = models.UUIDField(primary_key=True, editable=False, default=uuid.
> uuid4)
> name = models.CharField(
> _('Name'),
> max_length=200,
> validators=[MinLengthValidator(settings.
> MIN_LENGTH_FOR_NAME_OR_TITLE_OBJECT)],
> unique=True,
> error_messages={'unique': _('The such writter already is here.')}
> )
> slug = ConfiguredAutoSlugField(_('Slug'), populate_from='name', unique
> =True)
> #
> # basic trends of books
> #
> about = models.TextField(
> _('About writter'),
> validators=[MinLengthValidator(100)],
> help_text=_('Give brief character of the writter and his books.')
> )
> years_life = IntegerRangeField(
> _('years life'),
> null=True,
> blank=True,
> help_text='Enter year birth and year death, if have.'
> )
>
>
>
> I am tried next:
>
> Writter.objects.filter(years_life__endswith=None)
>
> but found error:
>
> allow_joins)
> 998 if value is None:
> 999 if lookups[-1] not in ('exact', 'iexact'):
> -> 1000 raise ValueError("Cannot use None as a query
> value")
> 1001 lookups[-1] = 'isnull'
> 1002 value = True
>
> ValueError: Cannot use None as a query value
>
>
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