_reverse_with_prefix() argument after * must be an iterable, not int

Question

I have used Django's reverse multiple times in the past but getting this error today which doesn't seem intuitive enough to debug:

TypeError: _reverse_with_prefix() argument after * must be an iterable, not int

Here's the view where I am using it:

from django.urls import reverse

...
...
def show_scores_url(self, obj):
    scores_url = reverse('get_scores', args=(obj.pk))
    return format_html('<a href="' + scores_url + '">Scores</a>')

...
...

This error appeared also when kwargs = {'pk',1} instead kwargs = {'pk':1} — Darwin, Nov 25 '22 at 13:33

Anupam · Accepted Answer · 2021-01-25T05:24:51.280

30

As mentioned in this comment, putting a comma at the end of the args tuple fixes it.

scores_url = reverse('get_scores', args=(obj.pk,))

(As mentioned in this SO answer, trailing comma is required for single-item tuples to disambiguate defining a tuple from an expression surrounded by parentheses)

Alternatively, as mentioned in the docs, using a list would work fine:

scores_url = reverse('get_scores', args=[obj.pk])

edited Jan 25 '21 at 05:24

answered Sep 30 '18 at 06:57

Anupam

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But, why is this necessary? (Neither link really explains why.) – JasonGabler Nov 07 '18 at 08:06
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@JasonGabler Good question. It is required for it to qualify as a tuple. I have updated the answer with this bit now. – Anupam Nov 08 '18 at 14:14

score 0 · Answer 2 · edited Oct 10 '20 at 01:04

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You can also try to use kwargs={'pk':models_saving_variable.pk}.

The final code will be:

return HttpResponseRedirect(reverse('app_name:view_name', kwargs={'pk': saving_variable.pk}))

edited Oct 10 '20 at 01:04

aboger

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answered Oct 09 '20 at 05:48

The.lYNCAN

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_reverse_with_prefix() argument after * must be an iterable, not int

2 Answers2

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