Python `==` operator does not check references, it checks values, so qs2 is
a copy of qs1 but its value is the same so == must be True as it's not now.
So I have a simple solution.
def __eq__(self, other):
if not isinstance(other, self.__class__):
raise ValueError('Cannot compare a QuerySet to a non-QuerySet.')
if not self.query.can_filter():
return NotImplemented
return not self.difference(other).union(other.difference(self)).exists()
On Wednesday, May 11, 2022 at 12:14:51 AM UTC+4:30 ma...@wpsoft.at wrote:
> I am not Agree.
>
> qs1.all() it is copy from qs1, the new object.
>
>
>
> I already try to write QuerySet compare on the Django 1.4 and i remember,
>
> that str(qs1.query) can be different as str(qs2.query), I am not Shure.
>
>
>
> Mit freundlichen Grüßen,
>
> DI Mag. Maxim Danilov
>
>
>
> +43(681)207 447 76
>
> ma...@wpsoft.at
>
>
>
> *From:* django-d...@googlegroups.com [mailto:django-d...@googlegroups.com]
> *On Behalf Of *mohamad ali mehdizadeh
> *Sent:* Tuesday, May 10, 2022 5:09 PM
> *To:* Django developers (Contributions to Django itself) <
> django-d...@googlegroups.com>
> *Subject:* Equality check for two QuerySet
>
>
>
> Hi.
> Why we don't have __eq__ for QuerySets, here is an example:
> ```
>
> qs1 = Model.objects.all()
>
> qs2 = qs1.all()
>
> qs1 == qs2
>
> ```
>
> output: False
>
> as we know these two are the same by value!
>
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