如何替换Django形式的TypedChoiceField的选择列表？

Question

I have a class which includes a field with a choice list:

class Game(models.Model):
    track = models.CharField(max_length=5,
                             choices=AllTracks.TRACK_CHOICES)

I want to use a form based on this model, but I want to pass it a subset of the choice list, PublicTracks.TRACK_CHOICES .

I've looked at the structure of the form. In the base_fields dictionary, track is a TypedChoiceField object. That object has an attribute choices , which is list(AllTracks.TRACK_CHOICES) . I've tried replacing it with list(AllTracks.TRACK_CHOICES) but it doesn't seem to take.

Any suggestions on how I might override the list from the model definition would be appreciated.

Answer 1

You can define a completely custom field on your form class, overriding the one that would be auto-generated from your model otherwise, as described in Overriding the default fields :

class GameForm(forms.ModelForm):

    track = forms.ChoiceField(choices=WHATEVER, ...)

    class Meta(object):
        model = Game