I think default should be assigned like this

 default=[ ] or
default= list()


But I'm junior so may I don't know well

On Mon, 12 Dec 2022, 03:13 James Gillard, <[email protected]> wrote:

> The callable list is indeed assigned as the default for the ArrayField, as
> documented here:
> https://docs.djangoproject.com/en/4.1/ref/contrib/postgres/fields/#django.contrib.postgres.fields.ArrayField
>
> The original issue has already had a patch merged, which will be released
> in 4.1.5, see the fix here:
> https://docs.djangoproject.com/en/dev/releases/4.1.5/
>
> On Sunday, 11 December 2022 at 18:02:24 UTC [email protected] wrote:
>
>> Hello Sir, I need to understand the form.py  file because , what  is the
>> only list you have assigned as default in arrayfield, is it the method
>> list() ?
>>
>>
>> On Sat, Dec 10, 2022 at 10:00 PM James Gillard <[email protected]>
>> wrote:
>>
>>> Thanks for the feedback. I opened a ticket and it was indeed confirmed
>>> as a bug: https://code.djangoproject.com/ticket/34205
>>>
>>> On Thursday, 8 December 2022 at 15:04:40 UTC Ryan Nowakowski wrote:
>>>
>>>> Might be a bug. Check the release notes for the post 4.0.8 versions to
>>>> see if anything related changed. File a bug with the simplest example code
>>>> that demonstrates the issue.
>>>>
>>>>
>>>> On December 8, 2022 6:37:52 AM CST, James Gillard <
>>>> [email protected]> wrote:
>>>>>
>>>>> I can't yet work out whether this is a Django bug or how I'm using
>>>>> model constraints... Upgraded from 4.0.8 to 4.1.4 and have hit this issue
>>>>> when saving this model in the admin. I'd read in the release notes that
>>>>> these constraints would be validated on model save, and that's the code
>>>>> that's leading to this exception. If it's not something I've done, it 
>>>>> seems
>>>>> ArrayField isn't working with this new validation of my condition. The 
>>>>> same
>>>>> happens for Q(phone_numbers__len__gte=0), and the error disappears if I
>>>>> comment out this condition. It seems the generated code might be wrong, as
>>>>> I see 12 "%s" and only 11 elements in params. All it's trying to do is
>>>>> ensure that an empty list isn't considered unique.
>>>>>
>>>>> Here's the failing model:
>>>>>
>>>>> phone_numbers = ArrayField(models.CharField(max_length=200),
>>>>> default=list, blank=True)
>>>>>
>>>>> class Meta:
>>>>>     constraints = [
>>>>>         models.UniqueConstraint(
>>>>>            fields=['phone_numbers'],
>>>>>            condition=~Q(phone_numbers__len=0),
>>>>>            name='unique_email_phones',
>>>>>         ),
>>>>>     ]
>>>>> )
>>>>>
>>>>> [image: Screenshot 2022-12-08 at 12.30.35.png]
>>>>>
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