Django RadioSelect从模型中选择

Question

So lets say I have the following model in my Django app:

class Gift_Card(models.Model):
    title = models.CharField(blah blah)
    company = models.CharField(blah blah)
    denomination = models.ForeignKey('Denomination')

class Denomination(models.Model):
    is_subscription = models.BooleanField(blah blah)
    is_money = models.BooleanField(blah blah)
    amount = models.IntegerField(blah blah)

It's poorly written, but this is what I'm going for:

• Generic gift card model
• Support for many types of amounts (1 year subscription card, $20 gift card, etc)

I have a form written to request a card from my Django app, and there is a quantity field (easy enough), a giftcard name field (for verification, and again, easy enough), and I want there to be a radio selection field . The radio selection field should be populated with the denomination model relevant to the gift card at hand. However, I'm unsure how to do that. Any help?

Answer 1

This is a widget-level choice, not a field-level choice, and the built-in RadioSelect widget does exactly what you're looking for:

https://docs.djangoproject.com/en/dev/ref/forms/widgets/#radioselect

Assuming you like its rendering choices, anyway. If not you can subclass, or on sufficiently recent versions loop over the choices in your template.

To use it, use a ModelChoiceField with the widget argument specified:

denomination = forms.ModelChoiceField(queryset=Denomination.objects.all(), widget=forms.RadioSelect)

Or, if you're using a ModelForm:

class GiftCardForm(forms.ModelForm):
    class Meta:
        model = Gift_Card
        widgets = {'denomination': forms.RadioSelect}