Hmmm, maybe related to https://code.djangoproject.com/ticket/26665 ?
On Thursday, August 27, 2020 at 5:29:39 PM UTC-4 Roy Smith wrote:
> I'm running:
>
> Python 3.7
> Django 2.2
> Debian 4.9
>
> If I configure a forms ChoiceField with a callback function for choices,
> it gets called twice each time I render the form:
>
> from unittest import TestCase
> from django import forms
>
> def callback():
> print("callback")
> return [('foo', 'bar')]
>
> class MyForm(forms.Form):
> f = forms.ChoiceField(choices=callback)
>
>
> class FormTest(TestCase):
> MyForm().as_p()
>
>
>
> prints:
>
> ./manage.py test spi.test_f
> callback
> callback
> System check identified no issues (0 silenced).
>
> ----------------------------------------------------------------------
> Ran 0 tests in 0.000s
>
> OK
>
>
> Is this a known issue?
>
>
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