How to dynamically update the 'initial' value in a Form ChoiceField

Question

I have a Form with the following field:

image_choices = [] 
images = forms.ChoiceField(label=_("Images"), choices=image_choices, initial="")

I need to be able to update the value of the 'initial' attribute, after I learn what that value should be. Currently, I have this assignment done within the __init__:

def __init__(self, request, image_choices=image_choices,
             flavor_choices=flavor_choices, args, *kwargs): 
    super(UpdateWorkload, self).__init__(request, args, *kwargs) 
    selected_image = selected_workload['image'] 
    self.fields['images'].initial = selected_image

I do not get any errors, and, when printed, the value is there, but, in the actual form on the screen, I still get my default list, and no specific items are selected, as per self.fields['images'].initial = str(selected_image)

How can I fix that?

FWIW, dynamic initial values have been a thing since Django 2.0: https://docs.djangoproject.com/en/2.0/ref/forms/api/#dynamic-initial-values — Palisand, Nov 04 '20 at 22:08

score 4 · Answer 1 · edited Jul 07 '17 at 21:04

4

After all, using this approach:

self.fields['images'].initial = selected_image
self.fields['flavors'].initial = selected_flavor

is working. The only thing I did differently was changing my backend from django restframework to tastypie

edited Jul 07 '17 at 21:04

Lev Levitsky

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answered Jan 25 '15 at 01:40

Eugene Goldberg

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How to dynamically update the 'initial' value in a Form ChoiceField

1 Answers1