DurationField format in a ModelForm

Question

I have a Django model that contains a duration field:

class Entry(models.Model):
    duration = models.DurationField()

And I want to render

Answer 1

You should be able to do this by providing a custom widget for the field:

from django.forms.widgets import TextInput
from django.utils.dateparse import parse_duration

class DurationInput(TextInput):

    def _format_value(self, value):
        duration = parse_duration(value)

        seconds = duration.seconds

        minutes = seconds // 60
        seconds = seconds % 60

        minutes = minutes % 60

        return '{:02d}:{:02d}'.format(minutes, seconds)

and then you specify this widget on the field:

class EditEntryForm(forms.ModelForm):
    class Meta:
        model = Entry
        fields = ['duration']
        widgets = {
            'duration': DurationInput()
        }

Of course, this will cause weirdness if you do ever supply durations longer than an hour...